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cpu/crossfire water cooling temps too high. - Page 3

post #21 of 26
Quote:
Originally Posted by ZytheEKS View Post

..... When was the last time you opened up your waterblocks? A bit of scaling over the surface and you basically have a insulating film over your heatsink. rolleyes.gif Keep in mind, good flow does not mean you would inherently have clean blocks. Gunked up blocks can mess up flow, but if material were to scale over the surface it might not mess it up that much.
His coolgate rad has a .3PSI pressure drop at 1gpm, the raystorm has a .7PSI drop at 1gpm. So if the Kamodo has a 1.5psi drop at 1GPM we're looking at an estimated 4.3PSI pressure drop. That's pushing upwards of what a D5 with stock top can handle. Whether that was indeed the problem or not, it would have been wise to upgrade regardless.


I would make sure your fans are getting proper airflow because, as PCilliterate said, with the orientation visual analysis suggests it seems like you may be having some weird air flow issues. Though it's kind of hard for me to tell your airflow by the picture linked. If you haven't opened up your blocks in a while, I'd check that too.

That is a completely different, more restrictive radiator. Even if the pressure drop was approaching the 4.6ish PSI a D5 can handle at 1 GPM, that isn't really a reason to need dual pumps. It takes a lot more restriction to drop flow rates by very much at all because when flow drops the individual restriction drops too. eg. It would take about twice the blocks and rads or more to drop flow to half a GPM.
A single D5 is plenty of pump for 2 GPU's and a CPU, especially when combined with 2 fat radiators like those.

The testing of 7970 blocks linked before was done with flow rates as low as 0.6 GPM and only as high as 0.7 GPM and temps were fine. The first block at least should have fine temps if it was a flow problem.

If Dual 480 rads can't cool 2 GPU's there are severe problems ... a lot worse than intake vs exhaust.
Edited by Jakusonfire - 8/2/13 at 7:37am
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Kusanagi
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post #22 of 26
Thread Starter 
Quote:
Originally Posted by Jakusonfire View Post

That is a completely different, more restrictive radiator. Even if the pressure drop was approaching the 4.6ish PSI a D5 can handle at 1 GPM, that isn't really a reason to need dual pumps. It takes a lot more restriction to drop flow rates by very much at all because when flow drops the individual restriction drops too. eg. It would take about twice the blocks and rads or more to drop flow to half a GPM.
A single D5 is plenty of pump for 2 GPU's and a CPU, especially when combined with 2 fat radiators like those.

The testing of 7970 blocks linked before was done with flow rates as low as 0.6 GPM and only as high as 0.7 GPM and temps were fine. The first block at least should have fine temps if it was a flow problem.

If Dual 480 rads can't cool 2 GPU's there are severe problems ... a lot worse than intake vs exhaust.

I will have to agree. yes airflow is important but I think this is more of an issue with the blocks themselves, or something else.
Quote:
Originally Posted by pc-illiterate View Post

i said this 3 days ago. from that picture, his airflow is crap. hell that rear exhaust fan is just sucking air in the top rear 'mesh' area and blowing it right back out. its circulating its own air. his rads are starved and no indication that attempts have been made to see if thats the problem.

*EDIT* - and i was wrong. he doesnt have 3 fans on his rad exhausing. he has 4 fans on that radiator exhausting. 99% probability thats what his problem is. its his LOAD temps that suck, his idle temps are bad. which is also an indication of poor airflow.

Yes this could be it but since I have been doing all my testing with the side panels off, I over looked this. Since the beginning, I have 2 120mm intake fans in the front of the case and I have turned the rear fan to also intake. All fans are set to intake except for the fans on the top rad(exhausting).
Quote:
Originally Posted by snef View Post

the shim is for universal block, no need shim with full block

74 is high for these block

specially at stock clock and voltage

2 things

not sit proprely or you need to open your block and clean it

can you check your VRM temp

The VRMs idle around 33-34c. at load using furmark, they never went over 50c. this is running the burn-in test on the first card.
post #23 of 26
Thread Starter 
Quote:
Originally Posted by ZytheEKS View Post

..... When was the last time you opened up your waterblocks? A bit of scaling over the surface and you basically have a insulating film over your heatsink. rolleyes.gif Keep in mind, good flow does not mean you would inherently have clean blocks. Gunked up blocks can mess up flow, but if material were to scale over the surface it might not mess it up that much.

I can try to take them apart since I haven't yet. i dont know how much "Gunk" they would have on them but its an idea. It seems like the CPU and my VRMs on the 7970s are running quite similar at idle and load, while the GPU core is whats really heating up. It could be something as stupid as dirty cloged blocks but i wont know unless I take them apart.
post #24 of 26
Thread Starter 
Opened the first block, this is what it looks like. Some gunk and build up around the fin array. Will clean them both and try that too.
post #25 of 26
Thread Starter 
Quote:
Originally Posted by Electrocutor View Post

that said, there still may be an issue with your GPU mount that should be ruled out first.

Your GPUs really ought to idle about 1-2C above the water temp, and increasing flow rate won't do squat to idle temps.

I am sorry to ignore your response and not really follow up with any tests on this aspect. In an act of desperation, i switched back to the stock cross bracket from the card in conjunction with the water block and it dropped my temps by ~5c. The card idles at 36c now. I am thinking more and more that it is a contact issue since I have tried everything that you and everyone else was saying. I have contacted Swiftech and we shall see whats what soon.
post #26 of 26
Hi

I had the same problem with my 7970 crossfire setup using the komodo blocks. I was just wondering if you found a way to fix it?
Edited by Luke92h - 11/24/13 at 5:00pm
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