CPU-Z 1.82.0 versus Task Manager (Win10 1709) - Ryzen 3 power-management behavior?

[VirtualLarry]

Trying to figure this out. Got a Ryzen 3 1200 CPU (3.1 nominal, 3.4Ghz Turbo), manually overclocked in an ASRock AB350M board, to 3.800Ghz @ 1.3500V. Fully stable, as far as I can tell.

Well, in Windows at the Desktop, with CPU-Z running in the corner, Firefox nightly 59a1 for Windows, and Task Manager running, showing the "Performance", "CPU" tab, it shows "Speed", and at idle, shows 3.37Ghz to 3.49Ghz. Yet, CPU-Z, on the "CPU" tab, shows the clock speed to be locked at 3.790Ghz, x38 multi, 99.76Mhz bus speed.

Can they both be correct? Can the multiplier and external clock be locked at those numbers in CPU-Z, and yet, the CPU behaves like it's running at 3.37-3.47Ghz?

Is there some sort of clock-modulation / stretching / throttling going on on-chip, to save a little power, that's not visible externally (not dropping external multi or input clock)?

It's really curious, I'm wondering who else is seeing this.

If I select "Bench" in CPU-Z, and click "Stress CPU", then Task Manager's "Speed" reading, pins to 3.79Ghz.

It should be noted, that Task Manager also displays "Base Speed" on the right hand side underneath the graph, and that is locked to 3.79Ghz.

So, what causes the discrepancy between CPU-Z's clock reading, which matches with Task Manager's "Base Speed", and Task Manager's (current) "Speed" reading?

 

[cfenton]

I can't help answer why this is the case, but I can confirm it happens on my system too. I have an R7 1700 at 3.7Ghz and task manager shows it idle at about 3.4, while other monitoring programs show it at 3.7 all the time.

 

[The Stilt]

Use HWInfo to monitor the individual cores.

 

[DrMrLordX]

Task Manager under Win10 has been showing goofy clockspeeds since forever. It did this on both my static-clocked Kaveris, and it does it on my static-clocked R7-1800x.

 

[VirtualLarry]

Use HWInfo to monitor the individual cores.

All six cores, show a current of 3791 Mhz, a low of 3737 Mhz (throttling?), and a high of 3814 Mhz. (XFR?)

Also, it seems like, when I'm overclocked to 3.800Ghz in UEFI, running the same 10-thread WCG load in BOINC, and F@H on my RX 580, that it seems that Task Manager reports a higher load percentage (100%, in this case), than when I'm at stock clocks (95% load). Seems a bit counter-intuitive to me.

Edit: Checking temps with HWMonitor, CPU Package temp got as high as 91C, hovering around 81-82C. Fan speed for "CPU fan" (my radiator exhaust fan for my MasterLiquid Lite 120), was dipping below 1000RPM.

I booted to BIOS, and it was still at 1000RPM, even after setting both Fan Speed controls to "Full Speed", and rebooting again back into BIOS.

So powered-down the system, and used some canned air, and boy, did a lot of dust fly out of the Rad. (Or got jammed into it too, maybe.)

Now, booted into Windows 10, HWMonitor shows 2000+RPM for that fan. Nice.

Normally, temps don't go above 80C, with decent fan-speed, even though it's a 120mm Rad.