Question 3950x - Is Ryzen Master or CPU-Z Misreporting Idle Clocks?

Ian_UK1

Junior Member
Jul 31, 2020
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New build - Fractal Define R6 USB-C case, Ryzen 3950x, Be Quiet! Dark Rock Pro4 cooler, Gigabyte Aorus x570 Elite with latest BIOS, 128GB Corsair Vengeance 3000, RTX 2060 Super, Samsung SSD. O/S is Win10 Pro; fresh install with the latest drivers from AMD and using Ryzen Balanced Power Plan. BIOS is at stock settings apart from XMP 'Profile 1' selected for memory.

The machine will be used for graphics work and rendering, won't be overclocked.

The 'problem'? At idle, both Task Manager and CPU-Z report clocks for all 16 cores at 3400MHz, whereas Ryzen Master shows all cores in sleep mode at about 100MHz! One (or more) of them must be wrong! Idle temps are about 35 deg C. with the Dark Rock's fans barely turning, so I'm guessing Ryzen Master is the tool reporting the clocks correctly? I'd be really grateful if anyone can offer any insights as to what might cause such a big difference between what Ryzen Master is reporting and what Task Manager / CPU-Z are reporting.

Thanks in advance for any suggestions you may have.
 

IEC

Elite Member
Super Moderator
Jun 10, 2004
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The processor has advanced hardware power management features and will sleep/idle at very low power states. In addition, it changes states so quickly that monitoring tools aren't that great outside of load situations.

If you do benchmarks and the performance is as expected AND you are getting proper idle in Ryzen master with cores at sleep, you have a properly configured system.

My 3950X at idle (ECO mode enabled):
3950 Eco Mode.PNG
 
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Ian_UK1

Junior Member
Jul 31, 2020
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Thanks for the suggestion. I'll install HWiNFO64 and see what it tells me. Ryzen Master does have a CPU Power Meter though - 4th one along in the screenshot above - that is showing a 1.3 - 1.4 W CPU power draw at idle, in my machine, with all cores in 'sleep' state. Interestingly, the SOC power draw (5th meter along) is 5x that of the CPU at idle. I'm guessing 'SOC' in the case of the Ryzen, means the I/O chiplet?
 

DrMrLordX

Lifer
Apr 27, 2000
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Thanks for the suggestion. I'll install HWiNFO64 and see what it tells me. Ryzen Master does have a CPU Power Meter though - 4th one along in the screenshot above - that is showing a 1.3 - 1.4 W CPU power draw at idle, in my machine, with all cores in 'sleep' state. Interestingly, the SOC power draw (5th meter along) is 5x that of the CPU at idle. I'm guessing 'SOC' in the case of the Ryzen, means the I/O chiplet?
Yeah all the Ryzen 3000 CPUs with an I/O die will burn some power @ idle which is why Renoir doesn't use an I/O die like that. And yeah Ryzen Master also has a power meter. I just find reading the percentages to be a bit annoying.
 

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