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Top card (2x GTX 980) overheating flow issue? (Pictures)

post #1 of 11
Thread Starter 
About a month ago I bought a second GTX 980. Since this weak I'm heaving trouble with the temperature of only one card.
Yesterday I cleaned the GPU's out and swapped the two cards from position. After some stress testing today I saw the previous top card having normal temperatures.
Before the clean out this card was going up to 95 degrees when normally they never go over 40 degrees.

This indicated the card isn't damaged. Now after doing another test the other card (now placed on the top PCI slot) gets to 95 degrees when stressed.
When I turn the stress test off after 10 min the card goes back to 30 degrees.

I looked at the manual of the EKWB water cooling bridge for the two graphic cards. It seems my flow goes in the other direction.



water cooling loop setup: res - gpu - gpu - cpu - rad - rad -res
My flow is clockwise


Question:
If I change the direction of the water flow, will this solve this heating issue?
Could it be possible my motherboard is damaged?


I have a EK Water Blocks EK-D5 PWM Pump. When I disconnect the power to the pump I see the temp rise slowly. (this is my indication the pump still works)
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post #2 of 11
I assume that bridge is the dual serial version. Because of that you have the flow and connections set incorrectly. The direction of the flow does not matter but the dual serial bridge needs to have the top connection on the right hand side. At the moment the flow is coming from the pump, through the bottom GPU block, up to the the top GPU block but not passing through it, instead exiting towards the CPU.

The top gpu and block is getting no direct flow and only minimal cooling from the water inside it mixing a little with the flow passing by it.

Edit: Although that looks like the parallel bridge so it should work fine. Hard to tell from the pic.
Edited by Jakusonfire - 9/23/15 at 6:04am
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post #3 of 11
I was under the impression that flow in these blocks need to go from the left hand port (closest to display outs) through the block and out the right hand port. This is due to the jet-plate and fin design inside the waterblock which from everything I have seen and used only works well in one direction.

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), default quality


So in the case of this image the water _should_ be flowing counter clockwise. In addition I believe the reason why only the card in the top position is having heat issues is because its being starved for flow. I'm no expert here so someone please correct me if I'm wrong but all signs point to this being the cause IMO.
post #4 of 11
Thread Starter 
Quote:
Originally Posted by Jakusonfire View Post

I assume that bridge is the dual serial version. Because of that you have the flow and connections set incorrectly. The direction of the flow does not matter but the dual serial bridge needs to have the top connection on the right hand side. At the moment the flow is coming from the pump, through the bottom GPU block, up to the the top GPU block but not passing through it, instead exiting towards the CPU.

The top gpu and block is getting no direct flow and only minimal cooling from the water inside it mixing a little with the flow passing by it.

Edit: Although that looks like the parallel bridge so it should work fine. Hard to tell from the pic.

Its a Dual parallel 3-slot. I thought this was ok because it said inlet and outlet possible...

Quote:
Originally Posted by xerythul View Post

I was under the impression that flow in these blocks need to go from the left hand port (closest to display outs) through the block and out the right hand port. This is due to the jet-plate and fin design inside the waterblock which from everything I have seen and used only works well in one direction.

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), default quality


So in the case of this image the water _should_ be flowing counter clockwise. In addition I believe the reason why only the card in the top position is having heat issues is because its being starved for flow. I'm no expert here so someone please correct me if I'm wrong but all signs point to this being the cause IMO.

I had only one card for a few months and the flow was the same direction. Never got an issue... But indeed I think you are right.


And even more strange the symbol and text would be upside down on the cpu if I correct the flow to -> res - rad - rad - cpu - gpu - gpu - res
Edited by dr_serious - 9/23/15 at 7:32am
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post #5 of 11
If it's not too much of a pain and you have the time will you try reversing the flow direction from where you have it now? This issue hits close to home as I am working on a build with the same exact setup (two 980s, 3-slot dual parallel) and this has me very curious. If you can run them either direction without problem, and your issues stem from somewhere else that might make my build a whole lot easier. I'm hoping it's an easy swap for you though..

To your edit, can you not just rotate the block 180 degrees and switch sides with the tubing? I mean you're going to have the loop drained anyways... ;-)
post #6 of 11
The direction of flow does not matter in these GPU blocks according to the guys @ EK, and on the product page of the blocks. It is fine to have them the way it is now. It wouldn't make sense to only affect one of them anyway.
I thought it should make a difference too but if it did it would never be to this degree. If it did make a difference we would only be able to use parallel setups and not serial.

If that is the parallel bridge then it should be working fine. The only thing that made sense with the symptoms was one card being starved for flow.

Maybe the top card is not being filled properly and has a large air bubble resting in it. Parallel arrangements are more difficult to bleed air out of. Or are you sure you didn't mix the cards up and the same card was at the top each time?
Edited by Jakusonfire - 9/23/15 at 7:54am
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post #7 of 11
Quote:
Originally Posted by xerythul View Post

I was under the impression that flow in these blocks need to go from the left hand port (closest to display outs) through the block and out the right hand port. This is due to the jet-plate and fin design inside the waterblock which from everything I have seen and used only works well in one direction.

EK says in the instructions that either port may be used as in/out

https://shop.ekwb.com/EK-IM/EK-IM-3831109869246.pdf

But the bridge would still need to be configured correctly to keep from possibly bypassing a card.
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post #8 of 11
Oh I read the same documentation from EK about the stuff, but why put that jet plate in then? Why not come up with a better pin-array or something for the gpu? If you run water through that block backwards the fins are still getting saturated, but the jet-plate is necking it down on the way out, instead of creating more directed flow on the way in. I guess what I'm trying to say is, I hear what EK is saying about it, but I don't trust it because the physical evidence says something else.
post #9 of 11
The purpose of the jet plate is to distribute the flow evenly along the IHS, as well as focusing the flow. The distribution effect works much the same either way. I would have expected it to be similar to CPU blocks of the same style where I'm pretty sure flow direction does have a small effect but you can bet the guys at EK have tested it out. If there is an effect it would be slight, not like the symptoms, otherwise everyone running serial multi GPU setups on new blocks would be getting markedly different temps.
Edited by Jakusonfire - 9/23/15 at 8:12am
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by Jakusonfire View Post

The direction of flow does not matter in these GPU blocks according to the guys @ EK, and on the product page of the blocks. It is fine to have them the way it is now. It wouldn't make sense to only affect one of them anyway.
I thought it should make a difference too but if it did it would never be to this degree. If it did make a difference we would only be able to use parallel setups and not serial.

If that is the parallel bridge then it should be working fine. The only thing that made sense with the symptoms was one card being starved for flow.

Maybe the top card is not being filled properly and has a large air bubble resting in it. Parallel arrangements are more difficult to bleed air out of. Or are you sure you didn't mix the cards up and the same card was at the top each time?

100% sure it isn't the same car at the top. (serial number)
I will do the air bubble test first before I change the flow.

Quote:
Originally Posted by GnarlyCharlie View Post

EK says in the instructions that either port may be used as in/out

https://shop.ekwb.com/EK-IM/EK-IM-3831109869246.pdf

But the bridge would still need to be configured correctly to keep from possibly bypassing a card.

I still don't get it why they say in/out in the manual of the Parallel...


The weird thing about all of this. I changed the water yesterday evening and let the stress test run 8 hours when I was asleep. The card didn't overheat.
So sometimes the flow goes well. Maybe the pump loses power and can pull the water thru the cards anymore because of the wrong connection?
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