cekim wrote:
It seems, at least in windows, that something is stopping it from throttling the clock down with no load.

Make sure your Windows power plan is set to Balanced for it to automatically throttle between full overclock and down to 800Mhz as needed, assuming you are set to core voltage adaptive mode in BIOS with adaptive voltage set to same as you have in manual mode.

Steve N. Mavronis wrote:
Make sure your Windows power plan is set to Balanced for it to automatically throttle between full overclock and down to 800Mhz as needed, assuming you are set to core voltage adaptive mode in BIOS with adaptive voltage set to same as you have in manual mode.

I hadn't had to do that previously, but I see in linux it is throttling as before at 4.7, so you must be correct that it is the OS. Maybe I missed it this time around, I reinstall windows a lot on that machine and use it little to do other than test.

Running Windows 10? If so, the CPU failing to step down at idle after a while seems to be a bug. If you open the Windows Task Manager when nothing else is running, go to the "Details" tab and check to see if "System and Compressed Memory" is eating up around 15% or more CPU time continuously. That will stop SpeedStep from kicking in. It appears to be a Windows bug -- it's what's causing reports of portables consuming battery power too fast. On a desktop, it's annoying and tends to run the CPU a little warmer since it doesn't ever back down the speed.

I've seen my system do it particularly after waking from sleep. A restart will stop it. It took me a little bit to get stable sleep/wake/restart/power-off behavior anyway (Apparently typical of Skylake) so I never noticed it while I had sleep disabled. Once I enabled sleep (and only manually, no sleep timer) I started noticing that SpeedStep wasn't always reducing CPU speed after waking. And a little research shows this is a complaint on a lot of Skylake systems, not just custom overclocked rigs. Haven't found a way around it yet, so I shut the PC down when I leave for work and at night. And here's hoping the next major Windows 10 update ("Anniversary/Redstone") will fix it.

Steve N. Mavronis wrote:
Make sure your Windows power plan is set to Balanced for it to automatically throttle between full overclock and down to 800Mhz as needed, assuming you are set to core voltage adaptive mode in BIOS with adaptive voltage set to same as you have in manual mode.

Just so you're aware, there's a better option than this. Choose the high performance plan, but then modify it :

"Change Plan Settings"
"Change Advanced Power Settings"
"Processor Power Management"
"Minimum Processor State"

The setting defaults to 100%. In the balanced plan, it defaults to 5%. Change this value to 5% for the high performance plan as well. I don't know what else the high performance plan does, but it's enough to make a significant performance increase in several benchmarks over the balanced plan, and you still get all the advantages of speedstep/adaptive voltage.

Qwinn wrote:
Just so you're aware, there's a better option than this. Choose the high performance plan, but then modify it :

"Change Plan Settings"
"Change Advanced Power Settings"
"Processor Power Management"
"Minimum Processor State"

The setting defaults to 100%. In the balanced plan, it defaults to 5%. Change this value to 5% for the high performance plan as well. I don't know what else the high performance plan does, but it's enough to make a significant performance increase in several benchmarks over the balanced plan, and you still get all the advantages of speedstep/adaptive voltage.

Nice thanks! I guess one of the other things balanced plan does is turn off hard drives when not in use and maybe network. I'll try this though.