Temps High on Custom Loop

  • Thread starter Thread starter mk1_salami
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therealdippy said:
@mk1_salami - I have been interested in this thread because there are similarities between your system and mine. This is my first ever water cooled system so I must have made mistakes but I seem to be getting much better results than you.

Prompted by your thread I have been doing a few of my own tests, rerunning Cinebench and checking my PBO settings. However I don't have any need for CPU-intensive applications so I have focussed more on monitoring temps during gaming. I have my system balanced to be as quiet as possible by allowing temps to get near the operating maximum, which is dominated by the CPU. During gaming my 5900X peaks into the 80-85C range and my 3090 can reach up to 50C. That's with the CPU peaking at 4,900 MHz and around 175W. I managed to achieve -24 on the fastest 4 cores and -30 on the rest. The GPU is undervolted and limited at 0.875V and 1,980 MHz with a 360W peak.

As you have noticed, cooling certainly makes a difference. I have a more aggressive set of fan curves which will shave off 10C from the CPU peaks. This curve tends to increase the fastest fans from about 600-700rpm to 700-800rpm with a noticeable increase in noise, so I'm happy to keep with the quieter curves as long as my CPU never hits 90C. My front rad is a 420 HW labs Black Ice SR2 60mm with 3x140 as intake. I also have 2x140 in the base as intake (no rad). The top rad is a 420 Alphacool XT45 45mm crossflow with 3x140 as exhaust and the rear rad is a 140 Alphacool XT45 45mm crossflow with 1x140 as exhaust. I have dual D5 pwm pumps which run at about 65l/h at idle and peak at around 135l/h when the water rises to 37-39C.

Let me know if I can give you any more data to help compare to your system.

I should have noted that although it had good reviews, I mainly chose the HW labs rad as intake because it only has 9fpi as opposed to the 12fpi of the Alphacools, in the theory that it would be less restrictive in passing airflow. The two bottom fans are just to ensure that I am getting enough cold air into the case and try to keep a positive air pressure (to avoid extra dust - although I'm not sure how much effect that has). I think at load my case air hits nearly 40C although I have not paid much attention to that.
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Do you have pictures of your setup?
 
Bit of a mini update. Some may have seen in the other thread that the second Xd5 pump I received made the same grinding noise as the first.

So … time to drain the loop again and replace it. While I’m there, I relocated the 480 to the roof, the 280 to the front and have ordered an additional 240 rad for the base of the case.

Top and front will be in push pull configuration. It’s a bit of an excuse to have a play again and add a third radiator. Will report back when I receive the new radiator and fans with the results. Here’s a small work on progress - mock up (not final runs) pic while I wait.


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