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Help with airflow for 8 GPU's?

post #1 of 104
Thread Starter 
Well, I'm going to be buying 8x 7950's here very soon. I'm building them into a custom wooden case that will fully enclose these GPU's (even the backs). So now, I need to figure out a way to keep them cool enough obviously.

I was thinking 2 of these as intake, 2 as exhaust (the exhaust will be ducted out to the window):
http://www.newegg.com/Product/Product.aspx?Item=N82E16835209021

Thoughts on this? Will that be enough air for 8x 7950's? Do I need more?

I want it to be somewhat quiet, but I need ALL of the heat dumped outside of my house.
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Junkyard
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post #2 of 104
Would work well with 8" ducting to the window. Convection will help if you have the setup(s) and air intake on the floor, but you'll still probably want/need more airflow. 200mm fans are probably a good choice since the amount of air moved is great to the noise output generally. Not very high-pressure, but with 8" ducting and convection on your side, it might not be too bad.

Best setup would involve plywood and foil/mylar to block up the window and keep as much outside out, and inside, in.
post #3 of 104
Thread Starter 
I was just going to build a very simple MDF box for the GPU's, run the PCIe risers in there, and the PSU cables, and cut holes for the fans. It was going to sit on my desk, on stands, above two motherboards (naked), and then vent out the window with 8" ducting.
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post #4 of 104
Help with airflow for 8 GPU's? - move to Tornado alley biggrin.gif
post #5 of 104
Depending on how close together the cards are I would ALMOST think high static pressure would be more important than total airflow.
Good SP + Convection would be super powerful for forcing air between the cards if they are close together.

But that depends on the setup,
If they have a single slot or more in between them I think the Big Boy arrangement would be perfect.
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post #6 of 104
Thread Starter 
Quote:
Originally Posted by PhilWrir View Post

Depending on how close together the cards are I would ALMOST think high static pressure would be more important than total airflow.
Good SP + Convection would be super powerful for forcing air between the cards if they are close together.

But that depends on the setup,
If they have a single slot or more in between them I think the Big Boy arrangement would be perfect.

Probably roughly 2 slots in between each card. I'm custom building the box that holds them, so really its not that big of a deal. They will be spaced apart nicely enough so that the cards can breathe.

I'm just worried about how to get 1600+ watts of heat out of that box so they don't overheat, then out of my house so I don't overheat.
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Junkyard
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CPUMotherboardGraphicsRAM
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Hard DriveHard DriveOptical DriveCooling
Crucial MX100 256GB WD Green 2TB DVDRW Corsair H50 Push / Pull 
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NZXT 120mm fans strapped to stock 7970 cooler Windows 10 Pro Dell 3007WFP Dell 2007FP 
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post #7 of 104
why not use slap a waterblock on each card and stick a radiator with the fan/s at the back, 4 fans on the front, 4 fans on the back with the radiator, and you're sorted! You're gonna have quite the radiator if you go air for 8 7950's.. 2 is bad enough lol
post #8 of 104
Quote:
Originally Posted by pioneerisloud View Post

Probably roughly 2 slots in between each card. I'm custom building the box that holds them, so really its not that big of a deal. They will be spaced apart nicely enough so that the cards can breathe.

I'm just worried about how to get 1600+ watts of heat out of that box so they don't overheat, then out of my house so I don't overheat.

With that much space, big boys and ducting is your best bet.

Why not use a refrigerator? rolleyes.gif
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post #9 of 104
Thread Starter 
Quote:
Originally Posted by Crispe View Post

why not use slap a waterblock on each card and stick a radiator with the fan/s at the back, 4 fans on the front, 4 fans on the back with the radiator, and you're sorted! You're gonna have quite the radiator if you go air for 8 7950's.. 2 is bad enough lol

Because water cooling 8x 7950's will cost me another $1000 or so perhaps? wink.gif
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Intel i5 2320 @ 3.1GHz MSI B75MA-E33 HIS HD7970 3GB @ 1050 / 1700, 1.17v Patriot 2x4GB DDR3-1066 
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Crucial MX100 256GB WD Green 2TB DVDRW Corsair H50 Push / Pull 
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NZXT 120mm fans strapped to stock 7970 cooler Windows 10 Pro Dell 3007WFP Dell 2007FP 
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OSMonitorKeyboardPower
Windows 8.1 + Steam Big Picture / Plex HT 50" Insignia LED 1080p Logitech Rosewill Green 530w 
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Silverstone HTPC Logitech Pioneer 2.0 tower speakers + 135w RMS Rosewill MCE Remote 
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Junkyard
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CPUMotherboardGraphicsRAM
Intel i5 2320 @ 3.1GHz MSI B75MA-E33 HIS HD7970 3GB @ 1050 / 1700, 1.17v Patriot 2x4GB DDR3-1066 
Hard DriveHard DriveOptical DriveCooling
Crucial MX100 256GB WD Green 2TB DVDRW Corsair H50 Push / Pull 
CoolingOSMonitorMonitor
NZXT 120mm fans strapped to stock 7970 cooler Windows 10 Pro Dell 3007WFP Dell 2007FP 
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Dell 2007FP Cheap Toshiba (R.I.P. Ducky) PC Power & Cooling Silencer MKIII 950w Cheap Garbage (free) 
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post #10 of 104

Completely off topic but, Do you plan on folding any?. I would love to see you PPD redface.gif

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