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570 sli GPU1 hotter than gpu2 ?

post #1 of 15
Thread Starter 
I've got some strange temps on my GPU's

Inno3D 570 (GPU1) and Vanilla 570(GPU2) using Koolance VID NX580 Blocks

I used the koolance paste that comes with the blocks but the GPU1 block was bought 2nd hand so I reused the thermal pads it had on the block since they were in good nick . Used a large dot method on both Gpu's for the paste.

Temps are great but they just way off from each other

GPU1 is reading temps 6-7 degrees hotter than gpu2.
This is my first time water cooling and always thought gpu2 would run hotter but gpu1 running hotter confused.gif


Loop order
Res/Pump > CPU> RS360 > GPU1 > GPU2 > RS120 > Res

Running OCCT (40-50% load)
570slitemps2.png

And running Tessmark overclocked for 1hr
570slitemps.png
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post #2 of 15
if i remember correctly. That is normal for SLI'd cards, as the first card has to process slightly more then the 2nd card.

(correct me if im wrong)
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post #3 of 15
Quote:
Originally Posted by patawic;15301934 
if i remember correctly. That is normal for SLI'd cards, as the first card has to process slightly more then the 2nd card.

(correct me if im wrong)

this^

top card is utilized therefore causing slightly higher temps
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post #4 of 15
Thread Starter 
Thanks guys rep for both of you. thumb.gif
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post #5 of 15
Perfectly normal dude

Another factor is the bottom card blocking off airflow to the top card which also heats up the top card, on top of that, heat rises so there is heat rising from the back of the bottom card into the top card,

again, perfectly normal dude, mine vary around 15 degrees.
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post #6 of 15
Quote:
Originally Posted by jacobrjett;15302049 
Perfectly normal dude

Another factor is the bottom card blocking off airflow to the top card which also heats up the top card, on top of that, heat rises so there is heat rising from the back of the bottom card into the top card,

again, perfectly normal dude, mine vary around 15 degrees.

water cooled
post #7 of 15
Comments on why GPU1 is hotter than GPU2 by 6-7C:-

1) The 2 cards are watercooled and so the usual 'top-card-is-hotter-due-to-relative-insufficient-airflow' does not apply to OP.

2) The loop order has GPU1 ahead of GPU2. Therefore, GPU1 should receive slightly cooler water and this factor alone should give GPU1 having a lower temp. But it appears not so.

3) The main card (usually the top card that has the monitor connected to) usually runs just a little bit hotter because it works just slightly harder. I think this factor alone accounts for, perhaps, 1-3C difference and certainly cannot explain the 6-7C delta.

4) IMHO, the main and chief reason is that a card is having a higher voltage than the other card's, even though both run at the same speed.

From the 2 pics, it is noted that the 2 cards have different Core Voltages.

Pic 1: GPU1 has 950mV vs GPU2 has 988mV
Pic 2: GPU1 has 1075mV vs GPU2 has 1100mV

So, the card (which is assigned as GPU1) which has lower core voltage should be cooler.

5) As to why GPU1 is hotter than GPU2 by 6-7C, I reckon it is because:-
Afterburner does not necessarily report the top card (ie in an upper PCIEx16 slot in motherboard) as GPU1. For instance, it reports my top GTX570 as GPU2 and my bottom GTX570 as GPU1.

To find out which is which, see this:
http://www.overclock.net/nvidia/1137594-solved-sli-setup-afterburners-temperature.html
Edited by windfire - 10/14/11 at 12:23am
post #8 of 15
Thread Starter 
Quote:
Originally Posted by windfire;15302797 
Comments on why GPU1 is hotter than GPU2 by 6-7C:-

1) The 2 cards are watercooled and so the usual 'top-card-is-hotter-due-to-relative-insufficient-airflow' does not apply to OP.

2) The loop order has GPU1 ahead of GPU2. Therefore, GPU1 should receive slightly cooler water and this factor alone should give GPU1 having a lower temp. But it appears not so.

3) The main card (usually the top card that has the monitor connected to) usually runs just a little bit hotter because it works just slightly harder. I think this factor alone accounts for, perhaps, 1-3C difference and certainly cannot explain the 6-7C delta.

4) IMHO, the main and chief reason is that a card is having a higher voltage than the other card's, even though both run at the same speed.

From the 2 pics, it is noted that the 2 cards have different Core Voltages.

Pic 1: GPU1 has 950mV vs GPU2 has 988mV
Pic 2: GPU1 has 1075mV vs GPU2 has 1100mV

So, the card (which is assigned as GPU1) which has lower core voltage should be cooler.

5) As to why GPU1 is hotter than GPU2 by 6-7C, I reckon it is because:-
Afterburner does not necessarily report the top card (ie in an upper PCIEx16 slot in motherboard) as GPU1. For instance, it reports my top GTX570 as GPU2 and my bottom GTX570 as GPU1.

To find out which is which, see this:
http://www.overclock.net/nvidia/1137594-solved-sli-setup-afterburners-temperature.html

Yeah had that happen to me before too where it would read the cards wrong.
Did your method and its showing the correct card as gpu1 and gpu2.

Gonna add a extra rad next week when it comes so I'll take it apart and add some mx4 and change the thermal pads with some new ones.
Edited by PhatLarry - 10/14/11 at 12:57am
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post #9 of 15
Quote:
Originally Posted by PhatLarry;15303020 
Yeah had that happen to me before too where it would read the cards wrong.
Did your method and its showing the correct card as gpu1 and gpu2.

Gonna add a extra rad next week when it comes so I'll take it apart and add some mx4 and change the thermal pads with some new ones.

My method can only find out which card is GPU1 and which card is GPU2 as shown by Afterburner. The method cannot change this assignment.

Sometimes for a reason (unknown to me, at least), Afterburner likes to assign the top card as GPU2 (instead of the expected and more logical assignment of GPU1). And this is what is happening in my situation. Some people, however, report that AB assigns their top card as GPU1.

I am unaware of any way to change this Afterburner's assignment. It is just a bit annoying but the important part is to find out which is which. Once this is found out, then you can relate all the numbers reported by AB to the actual physical card.
post #10 of 15
Thread Starter 
Quote:
Originally Posted by windfire;15303079 
My method can only find out which card is GPU1 and which card is GPU2 as shown by Afterburner. The method cannot change this assignment.

Sometimes for a reason (unknown to me, at least), Afterburner likes to assign the top card as GPU2 (instead of the expected and more logical assignment of GPU1). And this is what is happening in my situation. Some people, however, report that AB assigns their top card as GPU1.

I am unaware of any way to change this Afterburner's assignment. It is just a bit annoying but the important part is to find out which is which. Once this is found out, then you can relate all the numbers reported by AB to the actual physical card.


I know what you mean that it only finds out which is which.

Now just plugged my monitor to the bottom card(GPU2) and its showing monitor connected to GPU2 in nvidia control panel so its reading it correctly.
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