Question Low performance of DeepCool LS720?

[askaroth]

Hello everyone!

I have a DeepCool LS720 WH settled on i7-13700KF, but its cooling performance seems to be significantly worse than expected.

Initially, my MB auto settings set 1.35-1.4V for my CPU. During Cinebench test, it immediately hit 100°C, consuming 253W of power.

I undervolted my CPU to 1.24V and package temperatures during the test remain at around 87-90°C (core temperatures 80°C), idle package temperatures stay at 35°C. This result is of course acceptable, but significantly worse than the temperatures which are presented by others (maximally 80°C).

The cooler is mounted properly, I use custom thermal paste (Endorfy Pactum 4).

Does it mean that I have some kind of "weaker unit" of my cooling? Or an unusually hot CPU? Or maybe this kind of variation is normal?

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System specs:
CPU: Intel Core i7-13700KF
MB: MSI MPG Z790 EDGE WIFI
Cooling: DeepCool LS720 WH
Case: Fractal Design Meshify 2 RGB
PSU: be quiet! Pure Power 12 M 1000W

 

[kerberos_20]

whats your pump speed? should be shown as 3.1k +-10% rpm
if you see less, than thats youre reason why it doesnt performs as it should

 

[askaroth]

whats your pump speed? should be shown as 3.1k +-10% rpm
if you see less, than thats youre reason why it doesnt performs as it should

Pump speed is correct, it remains at approx. 3100 RPM

 

[kerberos_20]

then id say theres difference between your ambient temperature and "others" ambient temperature
if you have mounted radiator as exhaust, that would mean your ambient temperature is from PC insides, which could be around 40C ambient or more if GPU is pushing heat there aswell

 

[geofelt]

13th gen does run hot, but it is designed to do so safely.
Z790 motherboard may have a default to make the processor run as fast as ti can until it bumps up against the 100c. limit.
This is normal operation and fiddling with undervolting will simply reduce your performance.

Your aio is probably operating properly since it is new.
In time(think 5 years) air will intrude, reducing performance.

For best cpu cooling, mount the radiator in front where it can use fresh air.
For best motherboard vrm cooling and gpu cooling, mount the radiator on top using inside air for cooling.

I would not expect a magical difference which ever way you go.

 

[askaroth]

Thank you guys for your help. Z790 behavior seems explainable in the case of maximum power priority. There's only one thing that's not clear for me - I tested CPU behavior with default BIOS settings and then switched back to the same undervolted settings I mentioned above, the temperatures went even 7° higher (43 idle, 95 full load), voltage reached 1.3V (but power consumption stayed at 210-220W) despite having it set to 1.24. Other parameters (like pump RPM etc.) were okay. I don't know why it suddenly went way hotter with the same settings, the same ambient temperature and no additional load...