AMD Ryzen 3900X on a B450 Mobo

[Petrolhead]

Above 100c. Just keep them below 80c. Should be doable if you keep the cpu at stock or turn the SMT off when not needed. Issue with that is you might lose sleep function. Can you even do that with Ryzen Master?

Pointing the top and rear fans toward the motherboard might help cool the vrms too.

Probably being think, SMT?

 

[MartinPrince]

Whats an acceptable temp for the VRMs, mine are running 40deg C

Yep, keep them below 80c at full load, so something like a Handbrake encode that keeps the CPU at max for ~10min should get you there or you can use RealBench stress test.
What are you using to get the VRM temp, HWInfo64?

 

[Petrolhead]

What are you using to get the VRM temp, HWInfo64?

yes

 

[MartinPrince]

yes

Is 40c the max you see under >10min FULL load? Sounds a little low.

 

[Petrolhead]

I am starting to wounder if HWInfo64 is actually montoring VRM temp at all as it stays at 40 even when stress testing with Prime95

 

[Petrolhead]

Just been checking and my Mobo does not have VRM temp sensor