Maximus X Hero and Speedstep

[Gaspari]

Hi Everybody, 

 

So i have just got my i7 8700K with the Asus Maximus X Hero. I have delidded the cpu and used conducatanout and running a 360 radiator with push/pull config and running the 8700k @ 5.2 ghz (4.5ghz ring/cache) with no problems.  Im currently running 1.35v in manual mode. 

 

There is just one thing i cant get my head around, in my earlier mobo MSI Z97 Gaming 5 which is running a 4790K at 5ghz (1.4V). The beauty with this rig is that im running EIST (intel speedstep) so whenever the system is not doing any heavy loads it keeps it clockspeed but the voltage throttles down to let say 0.8v  when idle and when i start doing stuff it cranks up to 1.4V depending on load. 

 

On the Maximus X hero (my first Asus board) i have the intel speedstep activated but the system will just 1.344V all the time, if i change my power plan in win 10 it will throttle down the clock speed but not the Voltage. 

 

Does anybody know how what settings i have to go through to get EIST activated so it throttles down voltage (keeps clockspeed) when it's idling? 

 

Hope someone out there is an Asus guru that can help out! 

 

(Picture of build is attached for the one who is curious) 

Cheers! 

 

[Jurrunio]

c-state? You might need to use offset rather than manual to tune the voltage

[Gaspari]

Just now, Jurrunio said:

c-state? You might need to use offset rather than manual to tune the voltage

Where is the C-state configuration in the bios? I have looked for them but cannot find it!

 

 

[Jurrunio]

Just now, Gaspari said:

Where is the C-state configuration in the bios? I have looked for them but cannot find it!

 

 

or is it called p-state? I remember that's still a thing in Haswell and very likely still is in Skylake. It should be in either CPU config section or power management section

[Gaspari]

3 minutes ago, Jurrunio said:

or is it called p-state? I remember that's still a thing in Haswell and very likely still is in Skylake. It should be in either CPU config section or power management section

Found the C-State, it was set to auto, tried setting it to enable and see what's what. 

[Gaspari]

27 minutes ago, Gaspari said:

Found the C-State, it was set to auto, tried setting it to enable and see what's what. 

It only changes the clockspeed of the cpu but the voltage is still static. 

[Gaspari]

Alright, after som fiddling i got this nailed down: 

Activate Intel speedstep

Activate Turbo Mode

Activate CPU C-States 

Activate Ehances C-State 

CPU C3 Report Enabled

CPU C6 Report Enabled

CPU C7 Report (CPU C7s)

CPU C8 Report Enabled

C-State Limit Default

CFG-Lock Disabled

Intel speed shift Technology Enabled 

 

Activate CPUSVID and set to - Best scenario 

LLC set to Level 6 

 

Set Adaptive mode 

Set Negative offset

Set 1.35v (sweet spot for me) 

IA AC Load Line 0.1

IA DC Load Line 0.1

 

Keep high performance profile in Windows. 

 

Not my computer idles at 0.08v to 0.2V and clock drops down from 5.2Ghz to 4.8Ghz 

When setting load to the CPU it goes directly to 1.35V (1.344) and keeps it there and is set to 5.2Ghz 

 

I ran AIDA64 Stresstest on CPU/FPU/CACHE for 1h and 15minutes and had a max peak of 66 Degress C (20c ambient).