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azjazz
Adept I

Re: Updating my definitive guide to configuring the Ryzen 3900X/3950X and all other 3000 Series CPUs

@ajlueke - This writeup was very helpful!

I'm suspecting that you have a much more aggressive cooling solution than my lame ol' Noctuta NH-D15 for my 3900X CPU.

I peaked out at 65 DegC on Cinebench R23 at the "default-ish" PBO settings you suggested, and my multi-core Vcore hangs around 1.28V.

Just setting my PPT/TDC/EDC at 150W/100A/120A pushed my 3900X temperature up to 74 DegC and Vcore to 1.32 V.

It looks like my MSI X570 Ace motherboard doesn't have the gobs of headroom that you have, or I need to move to water cooling.

AzJazz

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ajlueke
Grandmaster

Re: Updating my definitive guide to configuring the Ryzen 3900X/3950X and all other 3000 Series CPUs

Probably a combination of things.  Matisse in particular didn't have loads of headroom, so the issue is most likely the Ryzen 3900X you are using.  I had very similar results with my 3900X as well.  It seems the Vermeer processors are a little bit better in that regard.

 

I do have an EKWB custom loop, but at a certain point the processor is limited by the heat transfer from the IHS to the cold plate.  No amount of increased dissipation will help, and the only way to get additional headroom would be to cool the coldplate below ambient.

You can try curve optimizer to get a bit of headroom on the voltage.  I would look in Ryzen master and take note of the two best cores on CCD0.  The numbering might be a bit different in Ryzen master vs UEFI, so keep that in mind.  Next, enter curve optimizer under "AMD Overclocking"  Give your two best cores a -5 voltage offset, and everything else on CCD0 a -10.  Set everything on CCD1 to -20, these cores should only be used in multithreaded workloads and should never need to clock up that high.

Repeat your benchmark and see if you gained anything from a voltage headroom perspective.

azjazz
Adept I

Re: Updating my definitive guide to configuring the Ryzen 3900X/3950X and all other 3000 Series CPUs

Thanks for the update, that's helpful. I'll give it a shot. Can I look at the cores Win10 seems to frequently use to determine the optimal cores I should set in UEFI?

I have been trying to get my hands on a 5950X for months now, and the closest I've come is getting it into my Best Buy shopping cart before I can successfully check out.

Me and the rest of humanity. 😀

AzJazz

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ajlueke
Grandmaster

Re: Updating my definitive guide to configuring the Ryzen 3900X/3950X and all other 3000 Series CPUs

Ryzen master should have the cores labeled up for you.  But Windows should be loading those cores as well, so I suppose the task manager would work.

 

I was able to snag a 5950X at my local Microcenter a while back.  Online orders just seem to be the domain of bots these days.  The Ryzen 9 5900X was actually out of stock faster at my store vs the 5950X.  The 5600X and 5800X have been in stock for over a month now.

azjazz
Adept I

Re: Updating my definitive guide to configuring the Ryzen 3900X/3950X and all other 3000 Series CPUs

Hi, @ajlueke,  I'm back!

I just installed my 5950X upgrade today, and followed your instructions. I'm seeing more of an effect of the settings on the 5950X, and more control.

My final settings (for now) are at 202W PPT / 135A TDC / 155A EDC

My Vcore voltage was around 1.27 V when running Cinebench, with a CPU temp of 74 DegC, CPU Clocks around 4265 MHz

I do have a few questions ...

  1. My PC idle temperature is a lot higher now, roughly around 43 DegC, where it used to be around 36 DegC for  my 3900X. My peak temperature on Cinebench with my 3900X was 60 DegC. Are these much higher temperatures for the 5950X normal? I'm wondering if I didn't apply my Thermal Grizzly compound properly to my Noctua NH-D15.
  2. When running other multi-threaded processes (like 7-Zip), I am seeing Vcore jump up to 1.46 V and my CPU temperature spikes up to 79 DegC. Multiple cores are at 4600 MHz for a short time while 7-Zip is running. Is this OK?
  3. My HWInfo Windows Gadget doesn't seem to be able to update while I am running Cinebench. I didn't see this occur with my 3900X. Not sure what to do here.

Thanks,

AzJazz

 

 

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