Why is CPUz, Handbrake running at 50% CPU load? Can't stop CPU throttling.

[ubiquityman]

This weekend I put together a system:
- CoreX 7820X
- 32GBDDR4 3200 (14-14-14-35) latency
- Intel P3520 1.2TB PCI-e SSD (boot)
- Seasonic Prime Titanium 750W
- Nvidia 1070X
- Two 2TB drive in RAID1 (mirror).
- Nepton 280 liquid cooler
- Windows 10 pro

I was able to get to 4.8 using the default OC profile on the motherboard.

MEMTEST86, everything passed.

I've only had a short bit of time with it, but the latest versions of CPU-Z (bench) and Handbrake run benchmarks at half speed. It's getting loaded to about 50% and I'm not sure why. Prime95 on the other hand does get the CPU >90% average. It doesn't matter if I'm OC'd or at base.

Is there a common reason for this behavior?

 

[1LiquidPC]

Are you running balanced power plan or high performance by chance?

 

[ubiquityman]

I've tried it both ways. On "Performance" profile, the CPU is set to 100% minimum, 100% maximum.

 

[1LiquidPC]

Are all your voltages on AUTO? I had a similar issue w/ my Ryzen build a few days back after assembly. Turned out that trying manual CPU voltage even on stock CPU speed would force a lower multiplier under stress testing. Like your situation, CPU said 100% minimum and maximum.

 

[ubiquityman]

I'm still having the problem. It probably not Handbrake specific, but I cannot find a way to keep the CPU cores at 100% (3.6GHz). CPUz shows they are dropping down to 1200MHz

I've tried the following:
1. set the power "Performance" profile to 100% min and 100% max on the processor
2. I've made the registry change that adds "Processor performance core parking min cores for Processor Power Efficiency Class 1", and then set that parameter to 100%.
3. I've disable speedstep in the BIOS.
4. I've set maximum processor frequency to 0MHz and I've also tried it at 5000MHz.
5. I've updated the chipset drivers to the latest 10.1.1.42 and also via windows update to 10.1.1.44
6. When I run handbrake, the CPU temp averages about 48'C "under load"

There's something going on with CoreX and Windows 10.
I'm not sure if it's SpeedStep, Processor/CPU throttling for power saving or something else?

 

[1LiquidPC]

Some folks solved similar issue by disabling Intel Adaptive Thermal Monitor setting in UEFI. Seems to be a sensor bug for some folks. However, this would disable thermal protection as well.

 

[ubiquityman]

Thanks for the suggestion. I tried disabled Thermal Throttling in BIOS just now but it didn't appear to make any difference.

 

[1LiquidPC]

OK. I see you disabled speedstep, what about the C-states in the UEFI as well? Outside of this, not sure what else to try. I have my X99 setup in signature running @ 4.4Ghz at all times on Windows 10 Pro. I disabled both speedstep and C-states in UEFI , and running manual voltage since August 2014.

 

[ubiquityman]

I had previously tried disabling all the C-States in bios, and again, that didn't help either.

But I did make some progress over the weekend. It was good and bad.

The good: I found out that the Intel overclock utility "Performance Tuning" was able to override the bios settings and get all the cores. As far as I can see, either I'm just not seeing something in BIOS or there's a BIOS bug that causes the default multiplier to be 12x.

The Bad: After I got things running for about a day, then the water cooler I have, Cooler Master Nepton 280L appears to have stopped pumping water.
I ordered a Noctual D15 which is supposed to cool 200W and installed that last night, but at stock voltages and at all cores hitting 4.7GHz, the D15 can't keep up. CPU is hitting 100'C so about 75'C above ambient. It doesn't add up. I'll create a new thread topic on that issue.

 

[1LiquidPC]

X299 is known to run very hot, even stock. Does your board turbo all cores by default up to max turbo? Some boards, including some ASUS boards I have, have this feature. Normally, only a few cores do. It runs much hotter than X99 and uses a good bit more power. Water cooling was said to be nearly mandatory in the X299 launch reviews.

 

[ubiquityman]

That's the AVX2 and AVX3 settings. if you set those to zero, then it turbos all cores.
So yes, I can get it to turbo all cores.