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[solved] GTX 460 SLI top card runs very hot

post #1 of 48
Thread Starter 
I just recently (like yesterday) buy another GTX 460 and upgraded my graphics subsystem to a SLI configuration ^_^
I've also changed my resolution to 1920x1080 from 1440x900. that was a huge difference.

the only problem is my motherboard only allows the cards to be right next to each other. Even though i've made sure there is like a 2mm gap between the first and 2nd card, the top card always run ridiculously hot compare to the bottom.

in heaven benchmark, I've got temps as high as 94 C on the top card after one initial run and a benchmark run after. the bottom cards run at 61 C
I decided to switch the cards and put the top on bottom and bottom on top. the previous top card that got 94 C has it's TIM changed to AS5.
after i did that, even though the 1st initial run of heaven has yet to complete, temperature on the top card was at 97 C and I was alarmed and exited the benchmark. bottom card was at around 58 C. i did not change the TIM on the new card.

also, whenever i put any kind of load on the bottom card, the idle temperature of the top card go up. like the top card usually idle in the 40s. when i fold on the bottom card, the top card (idle 51 MHz) go up to 49-50.
i suspect that the top card is using the exhaust of the bottom card to cool itself, hence the ridiculous temperatures.

is there anyway i can fix this?
btw both cards at running at stock 700/1400/1848.

PS: would adding a sidefan helps? one draw back of that is the side fan draws in significant amount of dust since it has no filter.
Edited by james8 - 2/25/11 at 5:50pm
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post #2 of 48
side fans may help.

there is no way you can separate the cards more?

if not then water cooling would lower temps for sure. but that is expensive
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post #3 of 48
Yea, my top card used to run around 10-15 degs higher when they were next to each other, one of the reasons I got a Crosshair IV.

Best thing i did was replace the stock factory paste, dropped temps on both cards by around 10 degs and made it much happier.

Other than buying a new board or going back to a single card, not much you can do - cept point a load of fans at it!
    
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post #4 of 48
95C isn't really anything to worry about on the GPU anyway. Thermal limit is 105C (when it will start to self-throttle) on GTX 4XX.

But as Crucial09 said, either try and seperate the cards more (farther slots) or possibly another fan providing fresh air. If you can't get a side fan a bottom fan intake may help, at least it did on my old case before I went under water.
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post #5 of 48
I assume both cards are identical?
I have 2 different cards, a Palitt reference card, and an MSI Cyclone. I ended up putting the cyclone into the main card position, as it had the better cooler to cope with the extra load of SLI. You may end up doing something similar. If they are the same, then a side fan to push air into the top card's cooler will definitely help. You may want something like an antec spotcool to really force air down between the GPUs.

Edit: If dust is your worry, then simply add an extra dust filter to it, either outside or inside the fan, I have the akasa filters on some of my fans, cheap and they do the job perfectly well. And if that fan hole does point directly at the GPUs, then consider something like the silverstone air penetrator fan to concentrate the air flow.
Edited by allikat - 2/24/11 at 8:50am
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post #6 of 48
Thread Starter 
so here's a photo to demonstrate my situation.
100_1473.jpg

I'm thinking about maybe a PCI-E cable so i can move the card 1 or 2 slots down. but i'm not sure if just securing the card by the 2 screws will be enough since the case is verticle and the bracket may break off O_O
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post #7 of 48
I also just bought a second GTX 460 today and after playing Just Cause 2 for a bit, my top card runs at around 80C and the bottom runs at around 60C. They are also right next to each other. Does this seem too hot to anyone?

The top card idles at 37C and the bottom card idles at 32C.
post #8 of 48
Quote:
Originally Posted by james8;12510648 
so here's a photo to demonstrate my situation.


I'm thinking about maybe a PCI-E cable so i can move the card 1 or 2 slots down. but i'm not sure if just securing the card by the 2 screws will be enough since the case is verticle and the bracket may break off O_O

Only use this as a very last resort.

Q1: What brand/model is the 2 GTX460s?
Q2: I see you list Thermaltake DuOrb as GPU cooling. Are you using that on both cards? I am seeing some blue shroud on the cards?
Q3: Can you remove the case side panel to show a better pic of your setup?

One thing you can do now to help out the temperature difference between the 2 cards:
Connect the monitor to the bottom card. With this move, you will make the bottom card the main card of the pair and the main card usually does just a little bit more work (thus slightly hotter) in a SLI setup. This should improve the temperature of the top card by, say, 2-3C.
post #9 of 48
just point a fan at them and call it a day. thats all they really need.
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post #10 of 48
the 1st card can't breathe that much air..same scenario as mine..the only solution i can think is buying and EVGA board..EVGA boards have 2 spaces/gaps between cards in SLI mode..well wth another 200$+ investment just to trim temps down..
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