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GTX 670 SLI issue

Last response: in Graphics & Displays
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April 19, 2013 6:35:37 PM

Hello guys,

I bought another 670 yesterday to SLI. The performance is fantastic but I am worried about the temps. The temps while idling are 34-38 degrees (2-4 degrees lower on the 2nd card). But the load temps while running heaven 4.0 are 69-70 degrees at 79% fan speed. The fan curve has been setup on Precision X. These are factory overclocked cards (slightly). These are my cards and they have a 680 PCB:

http://www.zotacusa.com/geforce-gtx-670-zt-60304-10p.ht...

My case is a Phantom Full tower and I have these fans installed:

1 140mm front intake 87CFM
1 120mm bottom intake 69CFM
1 120mm 5.25" bay intake 69CFM
1 120mm rear exhaust 45CFM
Corsair H100i Cooler at the top as an exhaust (Has gone for an RMA)

I have also changed the thermal paste on both the cards and that helped but not much. Any other suggestions guys. Below are the pics of my setup.







More about : gtx 670 sli issue

April 19, 2013 6:45:37 PM

70c is not high.
April 19, 2013 6:53:41 PM

Mousemonkey said:
70c is not high.



But the rate of the fan speed surely is. I am running them at 79% fan speed and they are loud. So I was thinking if I could optimize the airflow so that I could reduce my GPU fan speeds. Any suggestions? the 200mm side fan did not help me at all. So I removed it to keep my clear side panel on.
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April 19, 2013 7:06:33 PM

79% fan speed is high, considering 80% is the maximum on the reference 680 board.

Tbh, I let my 670's run up to 80 degrees celcius. Since it only goes down 13 mhz every 5 degrees, it means I only lose 26 mhz of performance in exchange for alot less noise. Let it run up to around 80 degrees I think.
April 19, 2013 7:07:44 PM

I tend to go for dual fan cards these days simply because of the noise that single cooler fans make.
April 19, 2013 7:38:45 PM

If you run at the reference fan speed, they aren't very loud, and all you lose is about 2% performance by JJ1217's numbers.
April 20, 2013 7:21:39 PM

bystander said:
If you run at the reference fan speed, they aren't very loud, and all you lose is about 2% performance by JJ1217's numbers.


I tweaked my fan profile a bit 1 degree = 1% fan speed and now the 1st GPU temps are max 72 degrees and 69 degrees for the second GPU. Still a bit loud but can manage. I also managed to change the cabinet fans with Corsair SP120 high performance but not a degree difference.

As far as my knowledge, the SP120's are used for RAD's and Heatsinks. Should I remove them and install normal airflow fans?
April 20, 2013 10:44:35 PM

what are the temps in-game? probably lower than the heaven bench. 70c is quite cool for a dual card setup.
April 20, 2013 11:02:24 PM

Mousemonkey said:
I tend to go for dual fan cards these days simply because of the noise that single cooler fans make.


irfan88 said:
bystander said:
If you run at the reference fan speed, they aren't very loud, and all you lose is about 2% performance by JJ1217's numbers.


I tweaked my fan profile a bit 1 degree = 1% fan speed and now the 1st GPU temps are max 72 degrees and 69 degrees for the second GPU. Still a bit loud but can manage. I also managed to change the cabinet fans with Corsair SP120 high performance but not a degree difference.

As far as my knowledge, the SP120's are used for RAD's and Heatsinks. Should I remove them and install normal airflow fans?


Just make it so they can run up to 80 degrees, you'll have minimal performance loss for a lot of noise loss.

Static pressure optimized fans don't have to be just for rads, they can be used if they need to push air through a tight space.. I'd leave them, they'll do fine and the benefit you'd get from changing would be minimal. The only real way to help I guess would be to have some fans blowing directly on the cards.
April 21, 2013 12:27:39 AM

JJ1217 said:
Mousemonkey said:
I tend to go for dual fan cards these days simply because of the noise that single cooler fans make.


irfan88 said:
bystander said:
If you run at the reference fan speed, they aren't very loud, and all you lose is about 2% performance by JJ1217's numbers.


I tweaked my fan profile a bit 1 degree = 1% fan speed and now the 1st GPU temps are max 72 degrees and 69 degrees for the second GPU. Still a bit loud but can manage. I also managed to change the cabinet fans with Corsair SP120 high performance but not a degree difference.

As far as my knowledge, the SP120's are used for RAD's and Heatsinks. Should I remove them and install normal airflow fans?


Just make it so they can run up to 80 degrees, you'll have minimal performance loss for a lot of noise loss.

Static pressure optimized fans don't have to be just for rads, they can be used if they need to push air through a tight space.. I'd leave them, they'll do fine and the benefit you'd get from changing would be minimal. The only real way to help I guess would be to have some fans blowing directly on the cards.



No, the side 200mm fan did not help at all. Probably because the shroud is covering the entire card unlike the aftermarket one's. So, the only way to feed the GPU's is near the blower fan. I changed the SP120 fans to CM Sickleflow's as they are airflow fans and immediately saw a 2 degree dip in load temps.

My question is, will a GPU backplate help in these circumstances? I want to buy 2 EVGA backplates for my cards just because they look great but will they help in cooling. I have heard people saying on various forums that they dissipate the heat from the PCB. I dont know how true it is.

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April 21, 2013 1:03:56 AM
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I installed two 670 FTW backplates on my card (Make sure you get either a 670FTW backplate or a standard 680 backplate), and they reduced temps by around 3 degrees at load. Not sure if its worth it, it really depends on your airflow.

Seriously, running them at 70 degrees is going to be loud. Just let them run hotter, its fine.
April 21, 2013 1:32:57 AM

JJ1217 said:
I installed two 670 FTW backplates on my card (Make sure you get either a 670FTW backplate or a standard 680 backplate), and they reduced temps by around 3 degrees at load. Not sure if its worth it, it really depends on your airflow.

Seriously, running them at 70 degrees is going to be loud. Just let them run hotter, its fine.


Thanks mate. I will try and get them ASAP. Will also reduce the fan speed. Thanks for your valuable suggestions.
April 21, 2013 1:35:31 AM

Sorry I realised I actually meant to say I put two backplates on my two cards haha, not two backplates on the same card :) 
April 21, 2013 1:49:49 AM

JJ1217 said:
Sorry I realised I actually meant to say I put two backplates on my two cards haha, not two backplates on the same card :) 


They are all out of Stock. Damn!!!
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