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post #11 of 40
Power consumption of each card are different because the individual (ASIC quality).
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post #12 of 40
Quote:
Originally Posted by renji1337 View Post

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.

670 Windforces are a completely different story. They are blowing air off the top of the card back into the case.
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post #13 of 40
Quote:
Originally Posted by aesthetics1 View Post

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.

Seems several people agree with my bull ****! ...So how exactly does this hot air ALL get pushed straight out of the case without reaching the top GPU? Stick your hand on the back of a graphics card after a run of Valley and tell me its not hot! Even if you had a fan(s) next to the GPU's it will still recycle around the case unless you have some kind of duct straight out of the case from the card and even then it would have to be sealed off from the top card.

Exhaust style coolers are better for cooling but they still produce heat. Its a well known fact in SLI the top card runs hotter. You have an added component that gets very hot, its never going to not effect the temps unless you go for a water cooling setup.

It could be quality control, could be TIM but the cause will most likely be heat produced from the bottom card.
Edited by Darylrese - 5/25/13 at 2:44am
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post #14 of 40
Quote:
Originally Posted by aesthetics1 View Post

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.


Just to add onto Darylrese.. If ALL of the heat was being transferred off of the cards then we'd be running ambient temperatures. Seeing as this obviously isn't the case then there is obviously heat that is being trapped within the heatsink seeing as there are factors that come into play such as thermal tolerance, resistance, etc and the PCB absorbs heat also as it radiates off the GPU, VRM's, etc. Heat does indeed rise... Just because you have a fan that pushes the air around doesn't mean that it isn't trying to rise. Density of the air decreases as heat increases which means that hotter air will rise above cooler air regardless of the air flow. Seeing as graphics cards are NOT very aerodynamic this hot air will simply rise up and right into the top card. It's an extremely simple concept. Try touching the hood of your car after you drive for a few hours.. I guarantee there will be some heat wink.gif The same exact concept applies here. It's heat transference.
Edited by Feud - 5/25/13 at 2:51am
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post #15 of 40
Quote:
Originally Posted by Darylrese View Post

Quote:
Originally Posted by aesthetics1 View Post

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.

Seems several people agree with my bull ****! ...So how exactly does this hot air ALL get pushed straight out of the case without reaching the top GPU? Stick your hand on the back of a graphics card after a run of Valley and tell me its not hot! Even if you had a fan(s) next to the GPU's it will still recycle around the case unless you have some kind of duct straight out of the case from the card and even then it would have to be sealed off from the top card.

Exhaust style coolers are better for cooling but they still produce heat. Its a well known fact in SLI the top card runs hotter. You have an added component that gets very hot, its never going to not effect the temps unless you go for a water cooling setup.

It could be quality control, could be TIM but the cause will most likely be heat produced from the bottom card.

Quote:
Originally Posted by Feud View Post

Quote:
Originally Posted by aesthetics1 View Post

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.


Just to add onto Darylrese.. If ALL of the heat was being transferred off of the cards then we'd be running ambient temperatures. Seeing as this obviously isn't the case then there is obviously heat that is being trapped within the heatsink seeing as there are factors that come into play such as thermal tolerance, resistance, etc and the PCB absorbs heat also as it radiates off the GPU, VRM's, etc. Heat does indeed rise... Just because you have a fan that pushes the air around doesn't mean that it isn't trying to rise. Density of the air decreases as heat increases which means that hotter air will rise above cooler air regardless of the air flow. Seeing as graphics cards are NOT very aerodynamic this hot air will simply rise up and right into the top card. It's an extremely simple concept. Try touching the hood of your car after you drive for a few hours.. I guarantee there will be some heat wink.gif The same exact concept applies here. It's heat transference.

Actually he is right(if a little harsh with his comments),convection is not responsible,SLI/Xfire cards tend to have one hot one,normally the primary card. His answer of swap the cards to see if its a card issue (too much TIM..and that is common) is sound advice. The 2 6870's on my bench had the same issue and they are in a horizon layout so your hot air rises argument holds no water.
Edited by B NEGATIVE - 5/25/13 at 3:44am
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post #16 of 40
You need to remember aswell the top card has a monitor attached, which means it could run hotter than the bottom card which does not have to output to a screen (unless you have multiple screens of course!)

B NEGATIVE, Haven't seen you post in ages, how are you man?

Swapping the cards over to confirm one way or another is a good starting point, if the top card is still hotter, you can rule out quality control / TIM.
Edited by Darylrese - 5/25/13 at 3:34am
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post #17 of 40
Quote:
Originally Posted by Darylrese View Post

You need to remember aswell the top card has a monitor attached, which means it could run hotter than the bottom card which does not have to output to a screen (unless you have multiple screens of course!)

B NEGATIVE, Haven't seen you post in ages, how are you man?

Swapping the cards over to confirm one way or another is a good starting point, if the top card is still hotter, you can rule out quality control / TIM.

Very good mate,you?
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post #18 of 40
Quote:
Originally Posted by B NEGATIVE View Post


Actually he is right(if a little harsh with his comments),convection is not responsible,SLI/Xfire cards tend to have one hot one,normally the primary card. His answer of swap the cards to see if its a card issue (too much TIM..and that is common) is sound advice. The 2 6870's on my bench had the same issue and they are in a horizon layout so your hot air rises argument holds no water.

Ah.. you're right smile.gif My mistake.. I guess it comes down to which is more significant and sloppy stock thermal paste definitely takes the cake. It's a bit late here (haven't slept yet haha) and I apologize if I got a bit snippy.
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post #19 of 40
Quote:
Originally Posted by Zonda View Post

Power consumption of each card are different because the individual (ASIC quality).

This has an effect on it too, I swapped one of my 6850's over and the one with better temps was on top (so they both got to the same temperature). OP could try this thumb.gif

Also because heat rises.. That is the general consensus on forums worldwide..
 
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post #20 of 40
Thread Starter 
Quote:
Originally Posted by Darylrese View Post

You need to remember aswell the top card has a monitor attached, which means it could run hotter than the bottom card which does not have to output to a screen (unless you have multiple screens of course!)

B NEGATIVE, Haven't seen you post in ages, how are you man?

Swapping the cards over to confirm one way or another is a good starting point, if the top card is still hotter, you can rule out quality control / TIM.


Yea I swapped the cards, and the top card is still hotter. So the problem is not the card itself.
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