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2 GTX 780, temp difference

post #1 of 40
Thread Starter 
I have 2 EVGA GTX 780 vanilla in SLI. I can observe a difference of 6-7c between both cards under load in BF3 (all setting to max 4xaa HBAO etc.).


No OC (not yet). Fan is set manually @ 50%.

GPU 1 (top) : boost get it to 980mhz, temp : about 70c

GPU 2 : Boost get it to 993mhz, temp : about 64c


Is it normal that there is such a difference of temperature between both cards ? What is even stranger is that the GPU2 has a higher boost clock, but a lower temp....

Please note that the temperature difference is not caused by the SLI set up. GPU1 is plugged in the 1st PCI-E slot, while the GPU2 is plugged in the third PCI-E slot. So there is plenty of space between both cards.
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post #2 of 40
bad quality control.
post #3 of 40
Quote:
Originally Posted by Grindhouse View Post

I have 2 EVGA GTX 780 vanilla in SLI. I can observe a difference of 6-7c between both cards under load in BF3 (all setting to max 4xaa HBAO etc.).


No OC (not yet). Fan is set manually @ 50%.

GPU 1 (top) : boost get it to 980mhz, temp : about 70c

GPU 2 : Boost get it to 993mhz, temp : about 64c


Is it normal that there is such a difference of temperature between both cards ? What is even stranger is that the GPU2 has a higher boost clock, but a lower temp....

Please note that the temperature difference is not caused by the SLI set up. GPU1 is plugged in the 1st PCI-E slot, while the GPU2 is plugged in the third PCI-E slot. So there is plenty of space between both cards.

Even though there is space between them in sli, the top card will still be a higher temp than the lower card. 6'C is nothing to worry about. You could redo the TIM paste on both cards, very easy to remove the cooler to do it. The two Philips screws on the DVI port side of the card and all the pcb screws.
    
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post #4 of 40
Thread Starter 
Quote:
Originally Posted by MrTOOSHORT View Post

Even though there is space between them in sli, the top card will still be a higher temp than the lower card. 6'C is nothing to worry about. You could redo the TIM paste on both cards, very easy to remove the cooler to do it. The two Philips screws on the DVI port side of the card and all the pcb screws.

Why does the top card always have a higher temperature than the lower card ? If they were sandwiched I could understand..... But its not the case here.

Tomorrow i'll switch both card to see if theres a difference.
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post #5 of 40
Heat rises, the top card is higher up and sucks in the warmer air...simples!

Even the PCB getting hot on the bottom card will exhale and be sucked into the top card.

Totally normal no mater what gap
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post #6 of 40
Quote:
Originally Posted by Darylrese View Post

Heat rises, the top card is higher up and sucks in the warmer air...simples!

Even the PCB getting hot on the bottom card will exhale and be sucked into the top card.

Totally normal no mater what gap

This is complete bull****. Heat does not rise in a computer case, it goes where you push it.

If your cards are blower style, the heat is not radiating off of your card's heatsinks and going up. Cool air is sucked in from the case via the fan, and then shot out the back of your case. Hence blower.

Your cards could be showing different temps for a number of reasons, but 'because it's on top' is certainly not the reason.

1. One of your cards inherently will always be hotter because it's the main card in your SLI setup. Try swapping them to observe a difference.
2. As stated, quality control can be an issue. Re-apply TIM to both cards in an identical fashion, and try and observe a difference.
3. If your card is boosting higher, it is likely because its temp is lower, hence it is allowed to boost higher.

This is normal. I wouldn't worry about either card unless they are approaching unsafe temperatures. Cores on the same processor can vary by more than 6-7C, so between two different cards, it's definitely not uncommon.

Try swapping the cards (put card A in card B's slot), and report back, then try swapping your main card (plug your monitors into card B) and report back.
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post #7 of 40
you mean the heat off the back of the bottom card somehow magically goes out of the case too?
    
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post #8 of 40
use a custom fan profile on afterburner and voila no more issues with heat
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post #9 of 40
Quote:
Originally Posted by Vlasov_581 View Post

you mean the heat off the back of the bottom card somehow magically goes out of the case too?

No, not magically - that's where the air pushes it, assuming you have proper airflow.

The small amount of heat that radiates from the bottom of the card (I'm talking about bottom of the PCB) is negligible, and doesn't cause the 6-7C he's seeing.
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post #10 of 40
In SLI the top card will always be hotter, I've always had crossfire/SLI and the top card is always 5-10c hotter, in my case my windforce 670's the top is 10c hotter as it blows air into the case and well regardless of where fans push it, heat still well..rises even with blower types as when under load not all the heat is captured via heatsink and fan

You could try redoing the thermal paste with a better paste, if you have experience with it.
Edited by renji1337 - 5/24/13 at 10:50pm
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