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Irregular temps on card 3 of 4 on GPU Loop.

post #1 of 9
Thread Starter 
I am running 2x 295X2 in quadfire, with koolance waterblocks. MSI AB and OpenHardwareMonitor both read that the 3rd GPU(out of the 4 GPUs on 2 cards) is running a full 10C+ hotter while under load. The rest are within a degree or two of one another (hovering around 60-63C under load for the other three). The problem child can reach 73 or 74C causing it to throttle. They are roughly the same temps at idle (Around 40C, I have ULPS disabled). Any ideas on how find the issue? I am using koolance waterblocks on the two cards, I have already tried repasting them. While in idle all 4 temps on all 4 cards are very close. Whilst underload, the temperaturature curve mimics the other 3 but is 10-12 degrees Celsius hotter. Could a bad temperature probecause this? Should I attempt to repaste again? Thank you.
post #2 of 9
Try swapping the waterblocks, and see if the problem follows a card or a waterblock.

I had temperature on one GPU creeping up by +10 C after a few months; shuffled the waterblocks, and in a few months the problem reoccurred - following a particular waterblock. I replaced it and so far all looks good.
post #3 of 9
By any chance is your monitor connected to card with the higher thermals?


Run your rig through the paces again and compare the GPU Load and Power Consumption between the 4
Not sure of AB or Hardware Monitor have this, but I know GPU-Z does.

Also try stress testing and comparing everything on something you know for sure can fully utilize a quadfire set-up like 3dmark or Heaven. Oh and make sure V-Sync is disabled everywhere too.
post #4 of 9
Thread Starter 
That is solid. Thank you.

The GPU is the 1st GPU in PCIe slot 3. The monitor is hooked in slot 1 (Gpu's "0" and "1").
post #5 of 9
Quote:
Originally Posted by ocmersh View Post

That is solid. Thank you.

The GPU is the 1st GPU in PCIe slot 3. The monitor is hooked in slot 1 (Gpu's "0" and "1").

Cool, when you swapped the output to the other card did the temp increase follow it?

edit: So Your monitor is connected to the Slot one card which has Core 0 and core 1
and the card containing core 2 (the problem child) and core 3 has nothing connected to it's outputs.

That correct?

If so, and since you re-seated it already to no avail and all the other readings are correct and even, then I would try one last thing. Put a fan to be blowing on the back of the card with the higher temps. The second card in a multi gpu set-up can sometimes get stagnant air building up around it due to being blocked off.

If that fails to fix the issue as well, try the block swap. That way you will know for sure if your card is starting to fail on you or if the block is junky.

If the block is junky replace it with a good block from EKWB or Aquacomputer. Koolance blocks aren't nearly as good as those two normally.
Edited by DNMock - 11/1/15 at 12:37am
post #6 of 9
Thread Starter 
No I don't think so. I will have to get home and test to make sure.
post #7 of 9
From my experience having a monitor connected does not change GPU core temperature by any noticeable amount.
post #8 of 9
Quote:
Originally Posted by cmpxchg8b View Post

From my experience having a monitor connected does not change GPU core temperature by any noticeable amount.

That makes that card the master card, right? It's in charge of taking all the other 3 cards data and packing it up and sending it on it's way. I know after extended periods of time I've seen my primary GPU get 3 or 4 degrees hotter than my secondary card. Having 4 cards would be even more taxing after extended periods of time. Granted it's not much at all, but after 5 hours straight of a graphically intensive game that tiny extra bit slowly builds up.

Correct me if I'm wrong here, I do not know that to be a fact. Truthfully, if I were a gambling man, I'd say it's a lack of airflow on the back of that core since it drops right back down even with the others when it's not under load.
post #9 of 9
Quote:
Originally Posted by DNMock View Post

That makes that card the master card, right? It's in charge of taking all the other 3 cards data and packing it up and sending it on it's way.

Never seen anything like that. Host does that with GPGPU, and I suspect it's the same with graphics. I've no experience with the latter though.
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