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Watercooling for two GPUs

post #1 of 29
Thread Starter 
Hey guys. This is the first time I'm trying to build a WC loop and I need some help here. I'm building a custom case for the rig. It's going to be mining or folding and running some FTP services and such, not really relevant to this thread though. The question is how big of a rad I'm going to need to cool off lets say two unlocked/overclocked 6950s? It is going to be a GPU loop only so the setup I was thinking of is reservoir > pump > 240 rad > gpu > gpu. The thing is that the case is supposed to be quite small and quiet. I don't want my folding rig to keep me awake at night. That's why I'm going with WC instead of aircooling since such a small case doesn't have much of an airflow going through it. Simply put, is 240 rad adequate for two gpus going 100% 24/7?

Edit: In case you're interested here's the case I'm thinking of building. Still finishing off the design though.
post #2 of 29
I dont think so. Would be better 360.
post #3 of 29
Thread Starter 
240 would be great so I wouldn't have to use so many fans, three fans would make it a bit noisier. How about a 280 rad? I could make the fan holes 140mm so I could fit the 280mm rad in.
post #4 of 29
i have 2 loops in my rig my cpu only on the 360 and the gpu's on the 240 which most might think was backwards but oh well. i can tell you that my gpus never go above 45c on a RX240 in push pull. I think you would be just fine with a nice 240 radiator. You will need some beefy fans though so there goes your silence.
    
CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
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Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
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CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
KeyboardPowerCaseMouse
Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
Mouse Pad
nope! 
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post #5 of 29
Thread Starter 
Quote:
Originally Posted by microman View Post
i have 2 loops in my rig my cpu only on the 360 and the gpu's on the 240 which most might think was backwards but oh well. i can tell you that my gpus never go above 45c on a RX240 in push pull. I think you would be just fine with a nice 240 radiator. You will need some beefy fans though so there goes your silence.
Using 360mm rad and low noise fans then? 360 rads aren't that much more expensive than 240 ones.
post #6 of 29
that would be the route i would go if you were looking for silence.
    
CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
KeyboardPowerCaseMouse
Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
Mouse Pad
nope! 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
KeyboardPowerCaseMouse
Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
Mouse Pad
nope! 
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post #7 of 29
I would at least go with a 360 or the equivalent in surface area... I've got my 6950s unlocked and overclocked, and they put out a LOT of heat. The two of them plus my 2600K are almost hitting the 10 DeltaT barrier of efficiency in water cooling with modest overclocking (4.3ghz and 900/1375) while folding.

I would get a thinner 360 radiator with lower RPM fans, like the Swiftech radiator plus some 800-1200rpm fans (or faster fans just in case, and then use a controller to slow them down)
post #8 of 29
Thread Starter 
I don't know if I'll be overclocking them much, going to stay at stock volts I think. The heat output shouldn't get much larger just by increasing clocks. I'm going to post a kit I was thinking of, input would be much appreciated once again

Edit:

Quote:
Originally Posted by Dr.GumbyM.D. View Post
I would at least go with a 360 or the equivalent in surface area... I've got my 6950s unlocked and overclocked, and they put out a LOT of heat. The two of them plus my 2600K are almost hitting the 10 DeltaT barrier of efficiency in water cooling with modest overclocking (4.3ghz and 900/1375) while folding.
And by 10 DeltaT you mean 10celsius/fahrenheit over ambient? If not, please explain
post #9 of 29
A three fan radiator is not that noisy. Its only as loud as your fans.

Get a low FPI radiator like the Black Ice, and then some low rpm fans like the Noise Blockers. Its not to expensive of a set up, will keep your loop really cool, and will be very low in noise.

If your trying to stick to the 200 series, then I would say increase your fins per inch and then increase your fans cfm which usually translates into more rpms and noise.

There are thick radiators like the XSPC RX240 but with adding fans to that, and then trying to squeeze it into a case is interesting to do also. Low RPM fans can still do well with this, but comes down to thickness.
post #10 of 29
Quote:
Originally Posted by Tuxi View Post
I don't know if I'll be overclocking them much, going to stay at stock volts I think. The heat output shouldn't get much larger just by increasing clocks. I'm going to post a kit I was thinking of, input would be much appreciated once again

Edit:



And by 10 DeltaT you mean 10celsius/fahrenheit over ambient? If not, please explain
This is at stock voltage that it's running 900/1375. Not great clocks, but stable, and for stock voltage, I can't complain!

By 10c DeltaT, it means that the difference between the air temperature and water in the loop temperature (water-air), and I only post temps in Celsius to make it easy for people to understand and stay consistent. Here is more info on radiators and conditions, check this out.
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