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Dual boot from same BIOS, different overclock behavior?

post #1 of 4
Thread Starter 
I just built a system with a i7 4770k on an Asus Z87-A. I installed dual Windows 8.1 OSs.

I overclocked by changing BIOS parameters one by one and testing the results before proceeding.

The BIOS is set:

Enhanced Intel SpeedStep Technology: Enabled so the CPU frequency can increase and decrease as needed by the load.
EPU Power Saving Mode is also enabled, although whether enabled or not, it doesn't seem to affect anything.
CPU Core Voltage: Adaptive Mode so the voltage can increase and decrease as needed by the CPU.

Right from the start, the two systems behaved differently in one respect:

On one system, the CPU Frequency does indeed vary as required, just about always sitting at the minimum of 800 MHz because there's nothing going on. The voltage follows along, supplying just what is needed.

On the other system however, the CPU Frequency all the time stays at the maximum as set in the Core Ratio Ratio Limit, and the voltage correspondingly stays at the maximum set to keep up. It acts just like the EIST was not enabled, but of course it is.

When there is no load on either system. I can look right at each CPU and see that there's no load, yet one is idling and the other is running full out.

How can two systems running off the same BIOS behave differently like this?

Has anyone ever encountered anything like this or have any ideas what's going on?

My only idea is turn EIST off and back on and see if the misbehaving OS picks it up.
Edited by drobertbaker - 4/9/14 at 8:59pm
post #2 of 4
Try looking in your power settings in the misbehaving OS's control panel. go to advanced power options and look under minimum cpu state, make sure that it is not set at 100%. If it is set at 100% the cpu cannot downclock.
  
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post #3 of 4
Thread Starter 
Brilliant! AND you were right! Thanks for the fresh eyes. Now where is that REP button?
post #4 of 4
No problem!! Glad it worked out!
  
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