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Im confused about my Ryzen 3900X

Martin James

Martin James

Martin James

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Joined
3 Jun 2020
Posts
163
Im having issues with my new Ryzen 3900x. When I first built my system it was been cooled by a CoolerMaster AIO, but it was getting rather warm (60c at idle), it kept revving up the fans and I subsequently read a load of reviews saying that people had problems with it leaking without warning, so I ditched the AIO and got a CoolerMaster MasterAir MA620M. Now it seems quieter but still seems a tad hot at 50C at idle. I noticed that with the BIOS at nominal and no overclock, it runs the CPU at around 1.4V-ish but if I overclock all cores to 4.1GHz, it runs slightly cooler and at around 1.1V. So I’m terribly confused, why with no overclock does it run hotter and uses more volts than when I overclock it?? Not sure Im explaining myself but as the title says, Im confused.

Also, is it running too hot?

thanks

Martin
 
I believe they do run pretty warm most of the time, so I wouldn't say your temps are an issue. Under load, like rendering videos, I've seen mine reach well into the 80s and that's with a Noctua DH-15.
 
Martin James said:
Im having issues with my new Ryzen 3900x. When I first built my system it was been cooled by a CoolerMaster AIO, but it was getting rather warm (60c at idle), it kept revving up the fans and I subsequently read a load of reviews saying that people had problems with it leaking without warning, so I ditched the AIO and got a CoolerMaster MasterAir MA620M. Now it seems quieter but still seems a tad hot at 50C at idle. I noticed that with the BIOS at nominal and no overclock, it runs the CPU at around 1.4V-ish but if I overclock all cores to 4.1GHz, it runs slightly cooler and at around 1.1V. So I’m terribly confused, why with no overclock does it run hotter and uses more volts than when I overclock it?? Not sure Im explaining myself but as the title says, Im confused.

Also, is it running too hot?

thanks

Martin
Click to expand...

4.1ghz all core is about what a 3900X does at stock under all core loads so you've not really overclocked it, you've just lost the higher boosts it will do out the box under lighter loads. A 3900x will boost to 4.6ghz on 1-2 cores under light load.

Under all core load it won't be using 1.4V vcore, it drops a lot lower. Idle vcore like in the bios is around 1.4V, thats normal.

Your undervolt may well be so low you're actually losing performance. Normally if you undervolt too far you will see a drop in performance even if the clock speeds look OK.

I wouldnt worry about idle temps much at all, its all core load temps that matter. The Ryzen 2 dies are tiny being on 7nm so they run relatively warm due to the heat generated in such a small area.
 
Mine idles around 10C over ambient so unless you live somewhere hot those temps do seem high. Are you running the latest BIOS?
 
Martin James said:
Im having issues with my new Ryzen 3900x. When I first built my system it was been cooled by a CoolerMaster AIO, but it was getting rather warm (60c at idle), it kept revving up the fans and I subsequently read a load of reviews saying that people had problems with it leaking without warning, so I ditched the AIO and got a CoolerMaster MasterAir MA620M. Now it seems quieter but still seems a tad hot at 50C at idle. I noticed that with the BIOS at nominal and no overclock, it runs the CPU at around 1.4V-ish but if I overclock all cores to 4.1GHz, it runs slightly cooler and at around 1.1V. So I’m terribly confused, why with no overclock does it run hotter and uses more volts than when I overclock it?? Not sure Im explaining myself but as the title says, Im confused.

Also, is it running too hot?

thanks

Martin
Click to expand...





Yeah running at 1.1v it's cooler because you're losing performance and not boosting properly.
If you put the Ryzen back to stock it means that it's boosting properly , even though you think it's faster in GHZ with lowering the voltage it's actually making the cpu performance weaker.

AMD officially say that you shouldn't lower voltage because it affects performance. I have seen some lower it maybe 0.1or so but going significantly less than that will hurt it.
 
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