Undervolting CPU increases the temp

[benjii]

I'm setting up an HTPC, specs are Pentium G4560, 8GB DDR4 2400MHz and ASUS H110I-PLUS mobo. I've gone for minimal fans, so all I have is a 200mm case fan, the CPU cooler is just a heatsink, no fan. Therefore I'm undervolting the CPU. It's rock steady at .98v bios (.976v actual), after 8 hours of realbench, max temp was 68c on both cores.

I decided to drop it further, .95v bios (.944v actual) and after 70 minutes I noticed a max temp of 69 on 1 core and 68 on the other. I appreciate the 69c may be within the margin of error. However, why wouldn't undervolting it further reduce the temperatures more? My only thought was that some of the auto settings in the bios might be messing with it. The only options I've changed to manual are core voltage, dram voltage (to match RAM specs) and LLC (lvl 4).

Any insight into this would be greatly appreciated.

 

[benjii]

Sorry if being a bit obvious but did you let the PC cool down before you ran the 2nd test after dropping the voltage?

Giz

Yep, I did.

You've made a small drop in Vcore, (0.03V is nothing) you wouldn't expect a significant drop in temps.

As you rightly say it's likely just margin of error. Also did your ambient temps change?

Fair enough. I don't really have any experience undervolting, I've only ever added voltage and that makes a difference to temperature pretty quickly!

Thanks chaps.