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In SLI GTX 580 #1 hits 100c while 2nd hits only 75C - Page 2

post #11 of 16
Thread Starter 
Quote:
Originally Posted by windfire View Post
When these temperatures happen, are the 2 cards both under full load from gaming?
Both GPUs at 99% usage?

As there is an empty slot in between the 2 cards, the top card should be, in general, about 10C (15C most) higher than the bottom card. So, your 25C delta is unusual.

Suggestions:-
1) The 2 GTX580s run at the same speed for SLI. But they might not have the same voltage. Use the card with lower voltage at the top position.

2) Add a 120mm fan (blue in pic 1) right in front of the 2 cards to blow more air into the gap for the benefit of the top card.
If necessary, use a self made funnel (see the orange funnel in diagram 2 for the idea) to channel the air in.
Make sure cables are tidy up to not disrupt the airflow.






Good temperature numbers.
I suggest to make a wind shroud (funnel as shown by orange in pic 2 below) with hard construction paper or plastic to channel more air into the gap to further benefit the top card.

This simple move might bring down a few more degrees.
My cable are well arrange
The card are apart from each other
The temp rise at full load, when card are hitting 97-98% usage.
The flow my be block because i have my Radiator in the front incoming air fan but i have push and pull with air.

here is a better pic



Edited by eduardmc - 10/4/11 at 10:39am
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post #12 of 16
Does the air from the rad seem too hot to cool the 580's ?
It might explain why they are hitting such high temps under load...
especially since you're running 5ghz on your cpu...

Try checking how hot the air from your rad is when your running your gpu's at load..

But since you have a watercooling system, i'd recommend getting a couple of watercooling blocks for the gpu's!
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post #13 of 16
Thread Starter 
Quote:
Originally Posted by NicMer89 View Post
Does the air from the rad seem too hot to cool the 580's ?
It might explain why they are hitting such high temps under load...
especially since you're running 5ghz on your cpu...

Try checking how hot the air from your rad is when your running your gpu's at load..

But since you have a watercooling system, i'd recommend getting a couple of watercooling blocks for the gpu's!
thanx, i do have a 240 rad laying around, my use that. the only thing i need to buy is the 2 blocks and some fittings.
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post #14 of 16
NP =)

sounds like a good idea. costs some money though, but if you have a rad lying around, might as well use it =)
Keep us updated on your results!
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post #15 of 16
Thread Starter 
Quote:
Originally Posted by NicMer89 View Post
NP =)

sounds like a good idea. costs some money though, but if you have a rad lying around, might as well use it =)
Keep us updated on your results!
i wanted to update that i redid the thermal paste with "Gelid GC-Extreme" and got amazing result. Now my card max temp after playing BF3 for an hour.

Max temp 15 minutes 100C with original thermal paste

Max temp 1 hour 86C With GC extreme.

i cannot believe thermal paste made such a different.
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post #16 of 16
Quote:
Originally Posted by eduardmc View Post
i wanted to update that i redid the thermal paste with "Gelid GC-Extreme" and got amazing result. Now my card max temp after playing BF3 for an hour.

Max temp 15 minutes 100C with original thermal paste

Max temp 1 hour 86C With GC extreme.

i cannot believe thermal paste made such a different.
Ah, so it turns out the factory applied thermal paste of your top card is bad and that causes the unusual high temp.
Speaking with a hindsight and looking at your pictures, your 2 cards receive similar amount of airflow from the front rad and the temperature of air reaching the cards is also the same, so there should be around 10C delta between them (as I said in my first post).

Now, top card is 86C and the bottom card is 75C. The delta is much more in line with a typical SLI situation.


Quote:
Originally Posted by adjas View Post
Thanks for the advice on the shroud, going to look into, see how it performs

I'm actually thinking of doing this to my two cards, (probably over the weekend)

removing the bracket
This is actually a good idea. The shroud at the front end is meant for better intake and this bracket removal is geared at the rear end exhaust.

I have another proposal to further enhance the exhaust.
Read my posts in these 2 threads:-
a) post#5
http://www.overclock.net/graphics-ca...ng-system.html
b) posts #12 and #21
http://www.overclock.net/nvidia/1130...g-too-hot.html

This 'pull' fan system, if set up properly, can lower temp by 4-5C (at least).
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