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Will dual 240 radiators be enough for i7 920 4GHz & three GTX 480s? - Page 2

post #11 of 16
480s are just so hot.... and you have 3

I would go with the 1b option

Or why not run two loops?
post #12 of 16
If your going to be overclocking then my opinion is,no,not enough.

I base my opinion on me having 2 x 240mm rads and 1x 120mm rad,on this loop i run my cpu and the 2 cards in my sig,a 5870 and a 8800gtx.

I have to have my fans cranked up for long periods of gaming with my cpu overclocked to 4.3ghz.

I did have 2x 5870 and a 8800gtx and cpu on my loop but things where way too hot,i had to drop down my overclock and run my yate loons full whack all the time,still wasnt happy at this either.

Just finnished setting up an overclok today,4.4ghz with HT enabled,i got it stable but im not happy with the temps,im gona split the cpu of onto a loop on its own as the gpu's are making too much heat and cutting things close temp wise on my cpu,this is with my cards not even overclocked.

If your going to be overclocking then id say you really need to be beefing up the w/c loop you suggested as gtx 480' are notorious for banging out a fair amount of heat.
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post #13 of 16
i had my i7-920 @ 4.0 Ghz with a mcr 220 is push pull config. it was great. got better temps than a pa 120.3 with push config
post #14 of 16
I would also recommend more radiator capacity. You might wanna take a look at Martin's radiator calculators to see expected water-air temperatur delta for different radiator setups. They can be found here: link

I would estimate the heat generated by the system would be close to or abive 1000W for your OCed system when running GFX cards at peak. Entering a 360 + a 240 rad into Martins XSPC radiator spreadsheet and adding 17% gain from push-pull and 2000 RPM fans will give you a delta for about 10 degress celcius which is deemed average performance.

The Lian Li A77 is a really good case for water cooling if you can find it (the newer A77F might be ok as well but the A77 is really nice.). It easily fits a 360 up top and a 240 in the front both in push-pull if you like. Check out my build log of you would like to see how.

Luke997 has a build log with a I7 980 + 3 480GTX cards. He initially ran 360 + 240 radiators in push pull and got decent results. Later he added more radiator capacity for some overclocking madness .

Kind regards
Nordar
Edited by Nordar - 1/19/11 at 10:22am
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post #15 of 16
Thread Starter 
Good morning OCN! Wow, overwhelming response. Looks like the general take on this situation is no it will not be enough. I guess I'll be looking at a TJ07 then. Thanks for the help everyone! +reps all around.
post #16 of 16
I think if you use two Black Ice GTX240's with some 2500rpm San Ace's you could get by decently with 2 240 radiators. You could crank the fans on high when you are gaming, benchmarking or whatever generating heat with your 3 480's and turn them down with the fan controller when your GPU clocks are throttled back for quiet operation.

I calculated 1200 watts of heat from CPU and three GPU's for a water temperature of 28C with Ultra Kaze fans at 3,000rpm's. I figure the San Aces better static pressure will offset the 33 extra CFM. I used Skinnee Labs 480GTX XLS heat estimator.
http://martin.skinneelabs.com/HWlabs480GTX-Review.html
How much heat watts do the 480's put out with a full coverage block? I figured 300W each but I doubt they put out that much heat. Nvidia rates the GTX 480 at 250 watts maximum.



With only 1050 watts calculated, 300 for CPU and 250 for each GPU the temps are even better with the GTX radiators.


Edited by sgilmore62 - 1/19/11 at 1:45pm
    
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