[quote="RAGEdemon"]Great! Best of luck with the build!
The PSU should be fine for non-SLi.
For any future purchasers tho might read this:
As zig11727, ASUS isn't what it used to be. I have been buying top end ASUS boards for the last 15 years. Now, customer service and forums are a bit of a joke. I tried reporting a BIOS issue, and customer service team made it a point to try and misunderstand my bug report. After describing it for the 5th time, I requested to speak to an engineer - they sent me a form which they apparently sent to the development team. Nothing since, and no fixes. 2 months after a new board release and they still have the same BIOS that shipped with boards on day one. This is all on one of their most premium boards.
They also had a forum bug which wouldn't let you register for the first few weeks. I tweeted them about it, - no response and no other way to contact unless already registered. I ended up having to register in a round-about way from one of their other sites, the importing my registration into the forum, I was successful. I sent email to admin, and they tell me they are aware of the problem - for 2 weeks after launch, no-one could register to help each other out. simple problem to fix but no-one seemed to care to fix it.
ASUS might make decent products, but how it currently functions, especially regarding customer service on even premium products, it's a disgrace.
Any thoughts on RAM purchase?[/quote]This is the ram I ordered:
https://www.amazon.com/Corsair-Vengeance-3200MHz-PC4-25600-Memory/dp/B0143UM4TC
my psu is 7 years old, but its a tx750 corsair which was very good at the time. I haven't had any issues with it.
RAGEdemon said:Great! Best of luck with the build!
The PSU should be fine for non-SLi.
For any future purchasers tho might read this:
As zig11727, ASUS isn't what it used to be. I have been buying top end ASUS boards for the last 15 years. Now, customer service and forums are a bit of a joke. I tried reporting a BIOS issue, and customer service team made it a point to try and misunderstand my bug report. After describing it for the 5th time, I requested to speak to an engineer - they sent me a form which they apparently sent to the development team. Nothing since, and no fixes. 2 months after a new board release and they still have the same BIOS that shipped with boards on day one. This is all on one of their most premium boards.
They also had a forum bug which wouldn't let you register for the first few weeks. I tweeted them about it, - no response and no other way to contact unless already registered. I ended up having to register in a round-about way from one of their other sites, the importing my registration into the forum, I was successful. I sent email to admin, and they tell me they are aware of the problem - for 2 weeks after launch, no-one could register to help each other out. simple problem to fix but no-one seemed to care to fix it.
ASUS might make decent products, but how it currently functions, especially regarding customer service on even premium products, it's a disgrace.
@RageDemon Should I mount my radiator in the front in a pull configuration or the top in push configuration? I want top optimize temps on my cpu and gpu, and also being able to easily clean the radiator. Here is my graphics card:
https://www.asus.com/us/Graphics-Cards/DUAL-GTX1070-O8G/
and of course my case.
http://www.corsair.com/en-us/carbide-series-740-high-airflow-atx-cube-case
iv'e seen conflicting videos on which mounting position has better performance.
@RageDemon Should I mount my radiator in the front in a pull configuration or the top in push configuration? I want top optimize temps on my cpu and gpu, and also being able to easily clean the radiator. Here is my graphics card:
Hey, that's good memory @ CL16 @ a great price!
Heat always travels upwards naturally so the ideal place to have the radiator is at the top pushing upwards.
This also means that it will expel the heat from the GFX card as it rises to the top.
IMO, having it at the front pulling inwards is not as good an idea as the heat is traveling into the system box you are trying to keep cool. Nice case btw!
Heat always travels upwards naturally so the ideal place to have the radiator is at the top pushing upwards.
This also means that it will expel the heat from the GFX card as it rises to the top.
IMO, having it at the front pulling inwards is not as good an idea as the heat is traveling into the system box you are trying to keep cool. Nice case btw!
Windows 10 64-bit, Intel 7700K @ 5.1GHz, 16GB 3600MHz CL15 DDR4 RAM, 2x GTX 1080 SLI, Asus Maximus IX Hero, Sound Blaster ZxR, PCIe Quad SSD, Oculus Rift CV1, DLP Link PGD-150 glasses, ViewSonic PJD6531w 3D DLP Projector @ 1280x800 120Hz native / 2560x1600 120Hz DSR 3D Gaming.
[quote="RAGEdemon"]Hey, that's good memory @ CL16 @ a great price!
Heat always travels upwards naturally so the ideal place to have the radiator is at the top pushing upwards.
This also means that it will expel the heat from the GFX card as it rises to the top.
IMO, having it at the front pulling inwards is not as good an idea as the heat is traveling into the system box you are trying to keep cool. Nice case btw![/quote]That's what made sense to me. Also, it would be easier to clean the radiator as dust should collect on the bottom of it with the air being forced out that way. I wanted to put the fans on top of the radiator by the way. Does the radiator block the air flow if you do it that way?
I saw this video though, and this guy claims its better to put it in the front due to the cpu getting hotter with the radiator up top. I'm not sure how reputable this guy is. Other people are claiming it makes no difference.
https://www.youtube.com/watch?v=xNAMxZgvves
RAGEdemon said:Hey, that's good memory @ CL16 @ a great price!
Heat always travels upwards naturally so the ideal place to have the radiator is at the top pushing upwards.
This also means that it will expel the heat from the GFX card as it rises to the top.
IMO, having it at the front pulling inwards is not as good an idea as the heat is traveling into the system box you are trying to keep cool. Nice case btw!
That's what made sense to me. Also, it would be easier to clean the radiator as dust should collect on the bottom of it with the air being forced out that way. I wanted to put the fans on top of the radiator by the way. Does the radiator block the air flow if you do it that way?
I saw this video though, and this guy claims its better to put it in the front due to the cpu getting hotter with the radiator up top. I'm not sure how reputable this guy is. Other people are claiming it makes no difference.
Informative vids giving lots of different perspectives.
I understand his point, and it is a good one: Front brings fresh air to cool CPU, whereas top uses already warm air to cool cpu which decreases efficiency.
I think I mentioned in a previous post that I have mounted my radiator externally on top of the case, so I am getting the best of both worlds - fresh air being pushed upwards. Perhaps you might want to try and do the same?
I used 4x long wood screws as legs and sealed the top vents of the case with tape to prevent hot air rising into the rad, but you can probably come up with a more elegant solution :)
Informative vids giving lots of different perspectives.
I understand his point, and it is a good one: Front brings fresh air to cool CPU, whereas top uses already warm air to cool cpu which decreases efficiency.
I think I mentioned in a previous post that I have mounted my radiator externally on top of the case, so I am getting the best of both worlds - fresh air being pushed upwards. Perhaps you might want to try and do the same?
I used 4x long wood screws as legs and sealed the top vents of the case with tape to prevent hot air rising into the rad, but you can probably come up with a more elegant solution :)
Windows 10 64-bit, Intel 7700K @ 5.1GHz, 16GB 3600MHz CL15 DDR4 RAM, 2x GTX 1080 SLI, Asus Maximus IX Hero, Sound Blaster ZxR, PCIe Quad SSD, Oculus Rift CV1, DLP Link PGD-150 glasses, ViewSonic PJD6531w 3D DLP Projector @ 1280x800 120Hz native / 2560x1600 120Hz DSR 3D Gaming.
[quote="RAGEdemon"]Heat always travels upwards naturally so the ideal place to have the radiator is at the top pushing upwards.
This also means that it will expel the heat from the GFX card as it rises to the top.
IMO, having it at the front pulling inwards is not as good an idea as the heat is traveling into the system box you are trying to keep cool. Nice case btw![/quote]
No, this is false. It's a common error that I see on the webs, that heat always rises.
Heat rising is called convection, and it only happens in the absence of other forces. Like, a fan.
Think about it, if heat always rises, then what is the point of a ceiling fan?
Any fan, even the smallest used for computers can push the airflow however it damn well pleases, and convection has no role in a system with fans.
So, you can put your fans however it is easiest for you, or directs the airflow onto the parts you want coolest in a pull configuration.
As a general rule, I think the more important factor for airflow is actually keeping the system at positive pressure. That means directing all or nearly all airflow into the case via pull configuration.
The reason that matters is because the biggest source of heat will be dust buildup, which you will get within weeks of using a system. Anything you can do to slow dust buildup will keep your temps better.
Positive pressure works better here, to keep non-filtered air out of your system, and therefore less dust. Be sure to use filters on your input fans. One trick I use is to put Swiffer cloths on the input, because their static-cling attracts and holds dust.
RAGEdemon said:Heat always travels upwards naturally so the ideal place to have the radiator is at the top pushing upwards.
This also means that it will expel the heat from the GFX card as it rises to the top.
IMO, having it at the front pulling inwards is not as good an idea as the heat is traveling into the system box you are trying to keep cool. Nice case btw!
No, this is false. It's a common error that I see on the webs, that heat always rises.
Heat rising is called convection, and it only happens in the absence of other forces. Like, a fan.
Think about it, if heat always rises, then what is the point of a ceiling fan?
Any fan, even the smallest used for computers can push the airflow however it damn well pleases, and convection has no role in a system with fans.
So, you can put your fans however it is easiest for you, or directs the airflow onto the parts you want coolest in a pull configuration.
As a general rule, I think the more important factor for airflow is actually keeping the system at positive pressure. That means directing all or nearly all airflow into the case via pull configuration.
The reason that matters is because the biggest source of heat will be dust buildup, which you will get within weeks of using a system. Anything you can do to slow dust buildup will keep your temps better.
Positive pressure works better here, to keep non-filtered air out of your system, and therefore less dust. Be sure to use filters on your input fans. One trick I use is to put Swiffer cloths on the input, because their static-cling attracts and holds dust.
Acer H5360 (1280x720@120Hz) - ASUS VG248QE with GSync mod - 3D Vision 1&2 - Driver 372.54
GTX 970 - i5-4670K@4.2GHz - 12GB RAM - Win7x64+evilKB2670838 - 4 Disk X25 RAID
SAGER NP9870-S - GTX 980 - i7-6700K - Win10 Pro 1607 Latest 3Dmigoto Release Bo3b's School for ShaderHackers
Hey bo3b.
The idea that I was conveying is that because heat travels upwards "naturally", it's more efficient to have fans pushing/pulling hot air upwards rather than downwards, or in this case sideways :)
Second, after the fan stage, the hot air from the fans if using the 'side configuration' will travel over the motherboard and components, thereby heating them up before escaping from the top.
The idea that I was conveying is that because heat travels upwards "naturally", it's more efficient to have fans pushing/pulling hot air upwards rather than downwards, or in this case sideways :)
Second, after the fan stage, the hot air from the fans if using the 'side configuration' will travel over the motherboard and components, thereby heating them up before escaping from the top.
Windows 10 64-bit, Intel 7700K @ 5.1GHz, 16GB 3600MHz CL15 DDR4 RAM, 2x GTX 1080 SLI, Asus Maximus IX Hero, Sound Blaster ZxR, PCIe Quad SSD, Oculus Rift CV1, DLP Link PGD-150 glasses, ViewSonic PJD6531w 3D DLP Projector @ 1280x800 120Hz native / 2560x1600 120Hz DSR 3D Gaming.
[quote="RAGEdemon"]Hey bo3b.
The idea that I was conveying is that because heat travels upwards "naturally", it's more efficient to have fans pushing/pulling hot air upwards rather than downwards, or in this case sideways :)
[/quote]It should noted that my pc will be placed under my desk. So the bottom of my desk will be getting hot. It's tall enough to where it shouldn't be a problem like blocking a chimney. The front will obviously be pointed towards me with greater access to cool air in the room.
The idea that I was conveying is that because heat travels upwards "naturally", it's more efficient to have fans pushing/pulling hot air upwards rather than downwards, or in this case sideways :)
It should noted that my pc will be placed under my desk. So the bottom of my desk will be getting hot. It's tall enough to where it shouldn't be a problem like blocking a chimney. The front will obviously be pointed towards me with greater access to cool air in the room.
How about mounting it outside the case at the front pushing air forwards, with a gap of ~ 50mm? It ought to be enough to supply fresh air to both the inlets of the front of the case and the rad itself...
How about mounting it outside the case at the front pushing air forwards, with a gap of ~ 50mm? It ought to be enough to supply fresh air to both the inlets of the front of the case and the rad itself...
Windows 10 64-bit, Intel 7700K @ 5.1GHz, 16GB 3600MHz CL15 DDR4 RAM, 2x GTX 1080 SLI, Asus Maximus IX Hero, Sound Blaster ZxR, PCIe Quad SSD, Oculus Rift CV1, DLP Link PGD-150 glasses, ViewSonic PJD6531w 3D DLP Projector @ 1280x800 120Hz native / 2560x1600 120Hz DSR 3D Gaming.
[quote="RAGEdemon"]How about mounting it outside the case at the front pushing air forwards, with a gap of ~ 50mm? It ought to be enough to supply fresh air to both the inlets of the front of the case and the rad itself...[/quote]I don't think those hoses would reach my cpu. Also, that sounds difficult to do on my case. Id rather mount it inside. My case has support for 3 front fans but only comes with two. I think default config for front is intake as that has a dust filter there.
RAGEdemon said:How about mounting it outside the case at the front pushing air forwards, with a gap of ~ 50mm? It ought to be enough to supply fresh air to both the inlets of the front of the case and the rad itself...
I don't think those hoses would reach my cpu. Also, that sounds difficult to do on my case. Id rather mount it inside. My case has support for 3 front fans but only comes with two. I think default config for front is intake as that has a dust filter there.
I found a guy with a somewhat similar build as me. It looks like he mounted at the top and did install intake fans at the bottom.
[img]https://cdn.pcpartpicker.com/static/forever/images/userbuild/193918.1ce766e8861a6e01b093b5bd82484b66.1600.jpg[/img]
[img]https://cdn.pcpartpicker.com/static/forever/images/userbuild/193918.d842cd2edc0f47726d86973b07d66bbd.1600.jpg[/img]
[quote="RAGEdemon"]Hey bo3b.
The idea that I was conveying is that because heat travels upwards "naturally", it's more efficient to have fans pushing/pulling hot air upwards rather than downwards, or in this case sideways :) [/quote]
Yes, I understand what you are saying, but I'm pointing out that natural convection plays no role in our cases.
You can also think about this in the common sense way, which is to consider that if natural convection like a simple heat sink were more effective than fans, then why would we ever use fans?
However, maybe the natural convection as a force is strong enough to matter. I think it's not even close, but an order of magnitude would be useful.
Let's do some science.
Here is the Wikipedia page for Convection: https://en.wikipedia.org/wiki/Convection
At the bottom of that page they talk about natural convection versus forced convection (fans).
[i] if [img]https://wikimedia.org/api/rest_v1/media/math/render/svg/e613fdccb49dfe29e44d3622bc6b60f51e9fb1ab[/img], natural convection may be neglected[/i]
For the Grashof number and Reynolds numbers.
Grashof formula for vertical plates, like heatsinks:
[img]https://wikimedia.org/api/rest_v1/media/math/render/svg/1196a6bd5e417a13cbcdc8067b131b6b0d38dac1[/img]
Simplifying a bit, let's use 20° C for room/bulk temperature, and 80° C for heatsink. Let's make L=0.1 meter (10 cm) for a giant heatsink length that is way beyond what we'd expect. v= kinematic viscosity in air, which is 1.568 for 20° C.
Thus: (9.8 * 1/80 * (80-25) * 0.1^3)/1.5^2 ≈ 0.003
We can maybe argue about the single flat plate of 10 cm, so maybe we make 10 vertical 10 cm plates in a heat sink array be 0.03 for the Grashof number.
If you then go to this page talking about fans and their Reynolds numbers:
https://www.qats.com/cms/2013/07/24/how-to-use-fan-curves-and-laws-in-thermal-design/
You can see that the Reynolds number for a normal ATX style fan is a [i]minimum [/i]of 2*106.
Let's call our Reynolds number about 200 then.
Using then the formula for deciding: [img]https://wikimedia.org/api/rest_v1/media/math/render/svg/e613fdccb49dfe29e44d3622bc6b60f51e9fb1ab[/img]
We have (0.03)/200^2 = 7.5e-7 = 0.00000075
I submit that qualifies as << (much, much less than). Which means we can ignore natural convection in any computer case.
The idea that I was conveying is that because heat travels upwards "naturally", it's more efficient to have fans pushing/pulling hot air upwards rather than downwards, or in this case sideways :)
Yes, I understand what you are saying, but I'm pointing out that natural convection plays no role in our cases.
You can also think about this in the common sense way, which is to consider that if natural convection like a simple heat sink were more effective than fans, then why would we ever use fans?
However, maybe the natural convection as a force is strong enough to matter. I think it's not even close, but an order of magnitude would be useful.
At the bottom of that page they talk about natural convection versus forced convection (fans).
if , natural convection may be neglected
For the Grashof number and Reynolds numbers.
Grashof formula for vertical plates, like heatsinks:
Simplifying a bit, let's use 20° C for room/bulk temperature, and 80° C for heatsink. Let's make L=0.1 meter (10 cm) for a giant heatsink length that is way beyond what we'd expect. v= kinematic viscosity in air, which is 1.568 for 20° C.
We can maybe argue about the single flat plate of 10 cm, so maybe we make 10 vertical 10 cm plates in a heat sink array be 0.03 for the Grashof number.
If you then go to this page talking about fans and their Reynolds numbers:
It certainly looks good, and it's 5 in vs 3 out which means ++ air pressure inside the case.
I have 2 fans at the bottom, and so can tell you that they are indeed a great help cooling the 2 graphics cards.
I think the best thing to do would be to experiment when you get it. With the system in hand, you might be able to think of configurations which are not occurring to us at the moment, for example possibly mounting it outside the case on one of the the wide sides :)
It certainly looks good, and it's 5 in vs 3 out which means ++ air pressure inside the case.
I have 2 fans at the bottom, and so can tell you that they are indeed a great help cooling the 2 graphics cards.
I think the best thing to do would be to experiment when you get it. With the system in hand, you might be able to think of configurations which are not occurring to us at the moment, for example possibly mounting it outside the case on one of the the wide sides :)
Windows 10 64-bit, Intel 7700K @ 5.1GHz, 16GB 3600MHz CL15 DDR4 RAM, 2x GTX 1080 SLI, Asus Maximus IX Hero, Sound Blaster ZxR, PCIe Quad SSD, Oculus Rift CV1, DLP Link PGD-150 glasses, ViewSonic PJD6531w 3D DLP Projector @ 1280x800 120Hz native / 2560x1600 120Hz DSR 3D Gaming.
https://www.amazon.com/Corsair-Vengeance-3200MHz-PC4-25600-Memory/dp/B0143UM4TC
my psu is 7 years old, but its a tx750 corsair which was very good at the time. I haven't had any issues with it.
https://www.asus.com/us/Graphics-Cards/DUAL-GTX1070-O8G/
and of course my case.
http://www.corsair.com/en-us/carbide-series-740-high-airflow-atx-cube-case
iv'e seen conflicting videos on which mounting position has better performance.
Heat always travels upwards naturally so the ideal place to have the radiator is at the top pushing upwards.
This also means that it will expel the heat from the GFX card as it rises to the top.
IMO, having it at the front pulling inwards is not as good an idea as the heat is traveling into the system box you are trying to keep cool. Nice case btw!
Windows 10 64-bit, Intel 7700K @ 5.1GHz, 16GB 3600MHz CL15 DDR4 RAM, 2x GTX 1080 SLI, Asus Maximus IX Hero, Sound Blaster ZxR, PCIe Quad SSD, Oculus Rift CV1, DLP Link PGD-150 glasses, ViewSonic PJD6531w 3D DLP Projector @ 1280x800 120Hz native / 2560x1600 120Hz DSR 3D Gaming.
I saw this video though, and this guy claims its better to put it in the front due to the cpu getting hotter with the radiator up top. I'm not sure how reputable this guy is. Other people are claiming it makes no difference.
Ryzen 1700X 3.9GHz | Asrock X370 Taichi | 16GB G.Skill
GTX 1080 Ti SLI | 850W EVGA P2 | Win7x64
Asus VG278HR | Panasonic TX-58EX750B 4K Active 3D
I understand his point, and it is a good one: Front brings fresh air to cool CPU, whereas top uses already warm air to cool cpu which decreases efficiency.
I think I mentioned in a previous post that I have mounted my radiator externally on top of the case, so I am getting the best of both worlds - fresh air being pushed upwards. Perhaps you might want to try and do the same?
I used 4x long wood screws as legs and sealed the top vents of the case with tape to prevent hot air rising into the rad, but you can probably come up with a more elegant solution :)
Windows 10 64-bit, Intel 7700K @ 5.1GHz, 16GB 3600MHz CL15 DDR4 RAM, 2x GTX 1080 SLI, Asus Maximus IX Hero, Sound Blaster ZxR, PCIe Quad SSD, Oculus Rift CV1, DLP Link PGD-150 glasses, ViewSonic PJD6531w 3D DLP Projector @ 1280x800 120Hz native / 2560x1600 120Hz DSR 3D Gaming.
No, this is false. It's a common error that I see on the webs, that heat always rises.
Heat rising is called convection, and it only happens in the absence of other forces. Like, a fan.
Think about it, if heat always rises, then what is the point of a ceiling fan?
Any fan, even the smallest used for computers can push the airflow however it damn well pleases, and convection has no role in a system with fans.
So, you can put your fans however it is easiest for you, or directs the airflow onto the parts you want coolest in a pull configuration.
As a general rule, I think the more important factor for airflow is actually keeping the system at positive pressure. That means directing all or nearly all airflow into the case via pull configuration.
The reason that matters is because the biggest source of heat will be dust buildup, which you will get within weeks of using a system. Anything you can do to slow dust buildup will keep your temps better.
Positive pressure works better here, to keep non-filtered air out of your system, and therefore less dust. Be sure to use filters on your input fans. One trick I use is to put Swiffer cloths on the input, because their static-cling attracts and holds dust.
Acer H5360 (1280x720@120Hz) - ASUS VG248QE with GSync mod - 3D Vision 1&2 - Driver 372.54
GTX 970 - i5-4670K@4.2GHz - 12GB RAM - Win7x64+evilKB2670838 - 4 Disk X25 RAID
SAGER NP9870-S - GTX 980 - i7-6700K - Win10 Pro 1607
Latest 3Dmigoto Release
Bo3b's School for ShaderHackers
The idea that I was conveying is that because heat travels upwards "naturally", it's more efficient to have fans pushing/pulling hot air upwards rather than downwards, or in this case sideways :)
Second, after the fan stage, the hot air from the fans if using the 'side configuration' will travel over the motherboard and components, thereby heating them up before escaping from the top.
Windows 10 64-bit, Intel 7700K @ 5.1GHz, 16GB 3600MHz CL15 DDR4 RAM, 2x GTX 1080 SLI, Asus Maximus IX Hero, Sound Blaster ZxR, PCIe Quad SSD, Oculus Rift CV1, DLP Link PGD-150 glasses, ViewSonic PJD6531w 3D DLP Projector @ 1280x800 120Hz native / 2560x1600 120Hz DSR 3D Gaming.
Windows 10 64-bit, Intel 7700K @ 5.1GHz, 16GB 3600MHz CL15 DDR4 RAM, 2x GTX 1080 SLI, Asus Maximus IX Hero, Sound Blaster ZxR, PCIe Quad SSD, Oculus Rift CV1, DLP Link PGD-150 glasses, ViewSonic PJD6531w 3D DLP Projector @ 1280x800 120Hz native / 2560x1600 120Hz DSR 3D Gaming.
Yes, I understand what you are saying, but I'm pointing out that natural convection plays no role in our cases.
You can also think about this in the common sense way, which is to consider that if natural convection like a simple heat sink were more effective than fans, then why would we ever use fans?
However, maybe the natural convection as a force is strong enough to matter. I think it's not even close, but an order of magnitude would be useful.
Let's do some science.
Here is the Wikipedia page for Convection: https://en.wikipedia.org/wiki/Convection
At the bottom of that page they talk about natural convection versus forced convection (fans).
if
For the Grashof number and Reynolds numbers.
Grashof formula for vertical plates, like heatsinks:
Simplifying a bit, let's use 20° C for room/bulk temperature, and 80° C for heatsink. Let's make L=0.1 meter (10 cm) for a giant heatsink length that is way beyond what we'd expect. v= kinematic viscosity in air, which is 1.568 for 20° C.
Thus: (9.8 * 1/80 * (80-25) * 0.1^3)/1.5^2 ≈ 0.003
We can maybe argue about the single flat plate of 10 cm, so maybe we make 10 vertical 10 cm plates in a heat sink array be 0.03 for the Grashof number.
If you then go to this page talking about fans and their Reynolds numbers:
https://www.qats.com/cms/2013/07/24/how-to-use-fan-curves-and-laws-in-thermal-design/
You can see that the Reynolds number for a normal ATX style fan is a minimum of 2*106.
Let's call our Reynolds number about 200 then.
Using then the formula for deciding:
We have (0.03)/200^2 = 7.5e-7 = 0.00000075
I submit that qualifies as << (much, much less than). Which means we can ignore natural convection in any computer case.
Acer H5360 (1280x720@120Hz) - ASUS VG248QE with GSync mod - 3D Vision 1&2 - Driver 372.54
GTX 970 - i5-4670K@4.2GHz - 12GB RAM - Win7x64+evilKB2670838 - 4 Disk X25 RAID
SAGER NP9870-S - GTX 980 - i7-6700K - Win10 Pro 1607
Latest 3Dmigoto Release
Bo3b's School for ShaderHackers
I have 2 fans at the bottom, and so can tell you that they are indeed a great help cooling the 2 graphics cards.
I think the best thing to do would be to experiment when you get it. With the system in hand, you might be able to think of configurations which are not occurring to us at the moment, for example possibly mounting it outside the case on one of the the wide sides :)
Windows 10 64-bit, Intel 7700K @ 5.1GHz, 16GB 3600MHz CL15 DDR4 RAM, 2x GTX 1080 SLI, Asus Maximus IX Hero, Sound Blaster ZxR, PCIe Quad SSD, Oculus Rift CV1, DLP Link PGD-150 glasses, ViewSonic PJD6531w 3D DLP Projector @ 1280x800 120Hz native / 2560x1600 120Hz DSR 3D Gaming.