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Considering adding a side fan onto my case

post #1 of 5
Thread Starter 
I have the Lancool PC-K62 case and just recently bought a 2nd MSI Cyclone GTX 460 running it in SLI.

under load, the top card is getting pretty hot. they idle fine at approx 38C each but running unigine for example the top card reaches about 78C while the bottom card hits 64C. Ive run furmark on them and while their performance is great, the temps rose and rose... at one point i have it logged at 87C for top card and 75C for bottom card. I wasnt logging it at the time but I also had the top card reach 92C in furmark before I stopped the stress test

I think the problem is airflow as the ambient temp of the case rises but im not exactly sure how to go about fixing it so im considering adding a side fan to feed air into the cards. my concern with this, though, is the way the msi stock cooler works.



it sucks air in pulling it over the fins and such so obviously the top card is constrained with air feed pulling warm air off the bottom card



now if I add a side fan to my case pictured below, with the way the msi cooler works what would be the best positioning of the fan? directly feeding onto the cards? have it off to the right somewhat feeding air on top of the right side of the heatsinks on the cards? or perhaps have a fan exhausting hot air directly off of the cards? i might could even put 2 fans side by side with one feeding in air to the right and one exhausting on top of the cards or something like that



also, if I mount the fan on the inside of the panel it will be very close to the cards. I know I can test this once I get the mod finished but would the fan work better if I mount it on the inside or the outside to get some more clearance?
post #2 of 5
Ouch, that's one miscaclulated GPU cooler..
A simple thing that comes to mind is- you can put a sheet of thick paper right above the second (lower) card. This will limit the hot air and won't let it heat the top card so much.
2 sheets of thick paper one ontop of the other is even better.

Now, I believe an *exhaust* side fan would be better there.

Because the issue here is that the hot air just circulates and doesn't get exhausted properly (because those aren't exhaust coolers).
An inake will pull cold air in, but it will also mix it with the already hot air, resulting in less than optimal cooling.
Exhaust fan would still pull cold air from the case intakes, but will also deal with the hot air, so there is just fresh air circulating around the cards.

This, +the paper trick and you're done

EDIT: Oh, and btw welcome to OCN
Edited by ronnin426850 - 7/18/11 at 1:02pm
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post #3 of 5
Thread Starter 
thanks ronnin

about the paper trick: what would be the best way to do that? cut some paper the same size as the card and just set it on the back of the bottom card or should I attach it in some way?
post #4 of 5
Quote:
Originally Posted by radman9000 View Post
thanks ronnin

about the paper trick: what would be the best way to do that? cut some paper the same size as the card and just set it on the back of the bottom card or should I attach it in some way?
Just set it there. As long as you don't jump around the room with the computer, it should be fine
Try it, and that case fan as exhaust and report back the temps It should make quite a difference..
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post #5 of 5
That is a hell of a design flaw for a cooler, just dumping all that heat into the case not to mention with the low clearance your air intake and outtakes are essentially the same thing...

I can say though, blowing air into the GPUs has been hugely effective in reducing my temps before, just feeding air straight into them.
    
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