Carpellix h150i pump speed too slow for 13700k

[Kulturnilpferd]

Hey there,

I love really your products but you must definetly incerase the pump speed of the h150i so that it can better cool these new types of Intel cpu's (13700k). The cooling fluid is on chilled 35 °C while it can't cool properly my 13700k on minimal OC settings with standard boost clock and even -80mV offset (undervolting). If i set the pump speed from "intensive" to lower settings its getting even worse. When I have mounted the cpu I checked the cooling paste that was factory applied (was in really good shape). The Pump is also installed lower than the highest point of the cooling system so it can't have any air bubbles in it decreasing the cooling function so I gues everything is working as itended (also defineltly everyhing installed like mentioned in the manual).

Maybe there are some other people using that type of configuration and have same bad results?

[c-attack]

This is more likely to be a contact issue vs slow pump speed. None of the current Corsair AIOs can be forced into a low flow state. A low flow state would cause coolant to linger in the block for too long in maximum load tests. It might be a couple of degrees higher than expected. If you are seeing more than that, it’s likely to be another issue or a unit with some type of blockage causing poor temps even when not loaded. Contact issues also reveal themselves with normal activities like browsing, gaming and other desktop work. A wide spread variation on P-core temps may also be an indicator. The new 1700 socket CPUs have some non-traditional contact problem that have received some media discussion. 

[Kulturnilpferd]

The Temperatures under normal specs are 35-40 °C while browsing, while gaming i got 50 °C but I have here some tensorflow and some things going on pushing it to its limits of 90-100 °C (on stock settings) with undervolting i can get it to 85 °C. What makes me curious that even the cooling fluid temp is barely rising from 35 °C to 40 °C, so I think a bit more speed to the pump would maybe solve the problem.  Last thing I want is to delidding it... 😄

Edited November 21, 2022 by Kulturnilpferd

[Kulturnilpferd]

Ah sorry forget to mention, the temp difference between the cores are max 4 °C idle and 8 °C under load, so bending or inproper installation souldn't be the problem.

Edited November 21, 2022 by Kulturnilpferd

[c-attack]

1 hour ago, Kulturnilpferd said:

What makes me curious that even the cooling fluid temp is barely rising from 35 °C to 40 °C

This is normal and not reflective of pump speed. Coolant temp change is watts conducted in, less watts dissipated out through the radiator. The cpu is cooled conductively. The liquid temp, radiator, and fans are waste heat disposal. So if your coolant delta is +5C, then if the cooling system was maximally efficient you could only reduce the CPU temp by those 5C. I don’t think that’s the reduction you’re looking for, so something else is in play. Any kind of blockage would be revealed with large liquid temp increases that never seem to come down. “Too slow” pump speed might add 2-3C to the liquid and cpu temp, but that doesn’t fit this either. 
 

I think we probably need to be looking at cpu watt output to put the cpu temps in context. Most of the mid to higher tier boards are going to override the Intel 253W limit and that may also effectively cancel the under volt. When I set my 13900K to default Intel limits and then balance the adaptive voltage, I can run something R23 at 5.5x8 and peak at 65C. Clearly something is different here. Not sure what that is yet. 

[Kulturnilpferd]

Awesome thanks for your advices will definetly look into the power limits. I initially have set it to 350W. But that is what I am intended to do: running the cpu always in turbo mode with default clocks without clock down after 56 seconds or when it runs into a power limit. The thing I observe is that even with a multiplier of 53(p) and 43(e) cores what is the default stock multiplier for turbo mode, it gets really hot if you doesn't undervolt it. Have managed it to cool it a bit down with undervolting and setting the tjmax to 85 °C so if the cpu hits that temp it reduces the multiplier. With these settings it only overheats and reduce clock if I run Prime95 with maxed out settings. I am fine with this but a bit sad that I couldn't get a x56 or x58 multiplier for the p cores that way...

[Kulturnilpferd]

Also didn't like the default Vcc of 1.4-1.42V  that my mainboard initially trown at my cpu when ideling (can't believe that this are default settings for a 13700k) Have now reduced it to 1.3-1.32V in turbo with full load it goes even down to 1.28V, that helps a lot and its even stable.

Edited November 21, 2022 by Kulturnilpferd

[c-attack]

I am not sure what motherboard brand you are using.  The info below was written for Asus but the values are not board tied to my knowledge and should be found in most motherboards.  The LLC range does change with boards.  Pick one in the middle.  The thread has a lot of overclocking information, but the really useful bit is the first step of setting up a baseline.  When I first installed my 13900K and ran it in straight Asus default configurations, I was into the 80s in Cinebench and mid 70s in a light stuff like CPU-Z.  After doing nothing more than turning the limits back on the values below, I could now run R23 in the upper 60s and my score went up several hundred points.  The author makes the point several times during the thread and thus far my experience agrees with the idea that these new high core count CPUs work best when they are temperature managed rather than throwing power at them.  Staying out of the throttle zone leads the highest results in anything that lasts more than 60 seconds.  Lots of press about massive watts and crazy temps, but when tuned my 13900K uses less power and run cooler than the 10900K it replaced while offering a big jump up in performance.

 

This about half way down the first page. It should apply to 13700K as well.

 https://www.overclock.net/threads/asus-maximus-z790-extreme-and-intel-i9-13900k-a-tuning-guide-for-beginners.1801569/

 

Tuning the CPU to run at standard frequencies with the lowest possible power and temperature

Enforce All Limits (If you desire you can remove all limits) *

LLC#4

DC_LL = 1.02

AC_LL = 0.2

IA VR Voltage limit = AUTO (or 1700 if you desire) *