potatojoe93

Replaced the coolant after flushing the system a dozen times with distilled water. I counted. Now using EK blood red coolant instead of Primochill clear. Temps have maxed out at 57C on the GPU. May consider additional rinses when it's time to replace the fluid again.

It would be my luck then to get two poseidons with defective blocks. I'll take it apart again and take pics, see if there's anything that anyone finds odd.

I think it is a flow problem. I'm still getting air bubbles out of the loop even though it's been filled for a month now.

The 92C was pre-paste change.

I've assembled/disassembled/modified this loop a few times and the temperatures have never really changed. Originally it was just a 280mm rad for the CPU alone, then added the GPU and a 420mm radiator, and I've noticed that the last radiator takes significantly longer to fill than the first, in spite of requiring a much smaller volume of water. I once had a second Poseidon 1080 Ti in the loop, but the cooler was defective (92C on water with all fans at 100%) so I had to send it back, and haven't found it back in stock since. Even then, the temps on the original Poseidon didn't change, and the GPUs were in parallel.

It's pretty rough, appearance-wise. However, there are no kinks anywhere in the tubes.

It's worth noting that idle temps sit usually in the mid-high 30C range, with the fans on the air cooler at 42%, so at that point the water is doing basically nothing, but without water the temps climb easily to 92C with the fans at 100%... And temps do NOT change if I squeeze the cooler and PCB together. And let's say I do add a second pump to the loop. I don't have anywhere in my case to put it. I could put it outside the case on top of one of the exhaust fans, but then powering it would be ... Interesting.

According to the PWM header on my motherboard, about 5000rpms

I also already cleaned up the CPU block already with a soft bristle toothbrush, but haven't taken the GPU block apart yet.

So... Should I try a better pump or just adding a second pump to my loop?

The contact with the block is good. I took the block off and replaced the stock thermal paste with Arctic Silver 5 already. Not sure about liquid temps but the tubing feels outright hot to the touch. The pump is just an EKWB D5 pump. Not sure what it's rated for to be quite honest.

So I'm running an Asus Poseidon 1080 Ti and an Intel i7 5820k in the same loop. There's two 420mm radiators and a 280mm radiator also in the loop. CPU temperatures sit in the low-mid 60s overclocked to 4.4GHz at 1.25V, but my GPU temperatures go as high as 70 degrees in some games. Shouldn't the temperature of a GPU with that much radiator space be a little bit lower? The fans are EK Furious Vardar 140. They draw enough power to dim the lights from the LED strips operated by the same controller.