I just built a watercooling loop for my PC and when the GPU is put under load it overheats. The GPU is an R9 390. The block is an EK full cover block. I checked and made sure the block was seated right and everything was making contact. At this point I am not sure what it could be and any help would be appreciated.
Overheating Watercooled GPU
- Thread starter jloch21
- Start date
Solution
- May 18, 2007
- 23,815
- 5,265
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If you are absolutely certain the block is making GOOD contact, then the next two most likely issues are no/insufficient flow and trapped air.
- May 18, 2007
- 23,815
- 5,265
- 108,890
Check that you haven't brain-farted and hooked things up differently from what you thought you had.
If the CPU and GPU blocks are hooked up in parallel, the CPU block may have much lower flow resistance and most of the flow is going there, leaving the GPU block starved.
Sufficient flow should be able to dislodge bubbles. Another thing you can do is remove the GPU from the PC, make the pump run and while the pump is running, tilt the GPU in every direction while keeping an eye on the hoses to see if bubbles come out, how fast and from which hose. If you see bubbles coming out of the inlet, then you know you have nearly zero flow - not enough to carry bubbles.
If the CPU and GPU blocks are hooked up in parallel, the CPU block may have much lower flow resistance and most of the flow is going there, leaving the GPU block starved.
Sufficient flow should be able to dislodge bubbles. Another thing you can do is remove the GPU from the PC, make the pump run and while the pump is running, tilt the GPU in every direction while keeping an eye on the hoses to see if bubbles come out, how fast and from which hose. If you see bubbles coming out of the inlet, then you know you have nearly zero flow - not enough to carry bubbles.
- May 18, 2007
- 23,815
- 5,265
- 108,890
If you have a parallel connection between the CPU and GPU blocks, disconnect the CPU block, put caps on its feeds and run the pump (use an external 12V source or disconnect everything from the PSU and use the PSU + paperclip to run the pump) to send all the flow through the GPU block. If there are bubbles in there, that should purge them.
Another possibility would be an obstruction in the GPU block.
If your blocks are setup in series, then both the GPU and CPU should be getting the same flow.
BTW, when you say that your CPU is staying below 40C, is that while running a burn-in test or idle? Idle temperatures are largely meaningless. If that was idle, run AIDA64, Prime95, SuperPi or anything else of the sort. If CPU temperatures shoot up, you have no flow through the CPU block either.
Another possibility would be an obstruction in the GPU block.
If your blocks are setup in series, then both the GPU and CPU should be getting the same flow.
BTW, when you say that your CPU is staying below 40C, is that while running a burn-in test or idle? Idle temperatures are largely meaningless. If that was idle, run AIDA64, Prime95, SuperPi or anything else of the sort. If CPU temperatures shoot up, you have no flow through the CPU block either.
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