Ryzen CPU Clock/Voltage fluctuations causing high load/idle temps?

[DoomSlayer]

I've been running my R7 3800X at 4625MHz all-core OC for its whole life at 1.375mvs (1.325mvs under full load), and idle temps were around 30 to 40c on my 360mm deepcool AIO... No degradation problems, day 1 overclocked to this frequency, for a good few months, probably closer to a year now.

Full load temps are around 65 to 70c.

Since I don't *always* run 4625, I set that in Ryzen Master, so it runs at stock clocks if I don't set anything. All I changed in the bios is boot speed, I also disabled spread spectrum and I set the LLC to Turbo.

So, when running stock clocks, the CPU voltage is all over the place. Usually gives me higher idle temps, 40c to 50c spikes.
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So I did some experimenting...

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This time I set the CPU to run at 4.1ghz all-core in the bios, I didn't touch the voltage. Now its running at 1.087mvs giving me a idle temp of 23 to 25c

Now, instead of using Ryzen Master, I set the CPU to run all-core in the bios at 4625MHz, at 1.375mvs instead of 1.381mvs. After a reboot, CPU is now running at 4625.1MHz on all-cores, at 1.350mvs SVI2....

Pretty much identical settings from Ryzen Master, except the bios is giving the CPU .025mvs less.

Idle temps are 25 to 26c with Steam, Edge Chromium (playing music) and HWiNFO open.

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Now for game stability/everyday computing testing.

(Here's HWiNFO Screenshots of the temps, 4100mhz all-core/4625 all-core temps)
https://imgur.com/a/uAoH7Jt

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Maybe this is why you always bios overclock?

I always found with the bios, at least with Ryzen CPUs, it doesn't give the CPU as much voltage as you give it. I put 1.375mvs for the vcore in the bios, yet it only gave the CPU 1.350mvs or less when on windows.

I always had an unstable idle temp. I have a feeling its because the voltage loves to go all over the place at idle, and suddenly when its limited to 1.100mvs, its super cold. Even overclocked to 4625MHz, 'fixed' voltage at 1.375, idle temps are WAY more stable than running the chip stock. Very strange, AMD...

[Illusion of Progress]

Can't speak much for overclocking with Ryzen as I haven't done it and doubt I will (but if I do, given I'm currently on stock fan and heatsink for the Ryzen 7 3700X and want to consider Zen 3, it will be later if at all).

From what I understand, however, at default settings, yes, Ryzen (at least Zen 2) voltage can get high (1.4V is common, and up to 1.5V isn't unheard of). Mine behaves this way. This should ONLY be happening at low load, so it is safe (low amperage draw at idle). Be careful when setting a fixed voltage, as I've heard conflicting personal opinions about what is safe or not under load.

And I might be old fashioned but I only ever overclocked through the BIOS/UEFI.

[[☥] - CJ -]

Well
In BIOS the system is basically in an idle state so couldnt that account for the small difference in BIOS compared to being in the OS?

[Illusion of Progress]

I've always gotten some degree less than what I set it at, BIOS or in the OS, even at idle, but especially under load where vdrop/vdroop needs to be taken into account.

[DoomSlayer]

引用自 Illusion of Progress：

I've always gotten some degree less than what I set it at, BIOS or in the OS, even at idle, but especially under load where vdrop/vdroop needs to be taken into account.

Yeah, voltage is way lower under load when setting the voltage in the bios. Now when the CPU is under full load, its running at around 1.319mvs SVI2, at 4625MHz all-core overclock.

I have never been able to get this type of stability (low voltage) using Ryzen Master at this high of a OC for a Ryzen 7 CPU.

Games are running way more stable now for example, Doom Eternal on Ultra Nightmare graphic settings at 1440p - I'm now averaging around 200fps with my 5700 XT, before I would get around ~160 to 180fps.

Assassins Creed Odyssey used to run at 60 to 70 fps maxed out at 1440p (GPU usage was around 75 to 80%), now I'm getting a stable 80 to 100fps (GPU now being fully utilized)...

So I guess setting the clock speed and voltage in the bios really made a difference...

(The second reason why I even overclock my CPU is temperature (and the high voltage), even at stock settings, the CPU ran warmer than it is now.)
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And for those on the fence about Ryzen CPUs and longevity...I've had this CPU for about a year, its been overclocked to this frequency on day 1 on the stock cooler, not my current AIO that I have now.

I haven't had any problems with my hardware, and I push the living crap out of my hardware. Overclocking, overvolting - I've done both on my CPU and GPU, I never had a problem. No degradation problems, CPU still runs amazingly at 4625mhz, I can even push it to 4650mhz without a problem.

My first ever AMD build, and other than minor driver problems with the GPU - its been perfect.

[Illusion of Progress]

That's, uh... quite a difference in frame rate merely from setting the overclock in the BIOS. Sounds like something else is being made different. I would normally guess boosting due to lower temperatures/different voltages, but if you're setting a fixed clock speed, I'm at a loss.

And I neglected to overclock since with Ryzen, it's often a case of choosing single core boost performance, or multi core performance. You usually trade a little of the former to get some of the latter unless you end up with a golden sample, and you often need good cooling as well. I currently don't have that, as I'm using the stock cooler for now (and again, may just wait to upgrade that until I do the CPU).

Glad things seem to be better off now for you though, though it's still somewhat strange as to why. I don't know much of Ryzen overclocking though so maybe there's a logical reason for it.