i5 6600k OC drop

[nvidiafanboi]

hi,

So when i run prime with my 4.5ghz overclock, after about 3 minutes the multiplier drops back to stock and then back to 45, it does this constantly.

im at 1.36v on the Vcore and temps never go above 65c before the drop happens.

any suggestions greatly appreciated.

 

[synphul]

Are you running the test with small fft's? If not try enabling that setting to allow the test to run at a steady state load. Other types of stress tests have a habit of running a variable load which fluctuates making it more difficult to establish cooling efficiency.

 

[nvidiafanboi]

yes, i was running the small fft test. the one at the top.

 

[synphul]

What motherboard are you using?

 

[nvidiafanboi]

the msi z170 gaming pro

 

[synphul]

Ok well it's not the slow mode switch common on other msi boards, it's not included on that one. Have you tried setting your overclock back to stock settings, rebooting and then running prime? See if it still does it, just to eliminate the possibility of a bios setting change being the problem.

Are you running prime95 version 26.6? There are some differences though I've not run the latest version. Typically it's recommended on haswell and later cpu's to run v26.6 but I'm not sure if that's got anything to do with it. I'd still think that small fft's would produce a steady state load unlike blend which cycles.

What are your settings like under windows power options? If set to balanced try high performance and run prime, see if that has any effect for you. You can also try reducing max cpu state under advanced options to 99% instead of 100% (sometimes there can be quirks). Another thing to check might be your c states in the bios, if c6/7 are enabled try disabling them. They should be under power options but I'm not overly familiar with the msi click bios 5. I tried looking at pics of both click bios 4 and 5 and had no luck finding a "c6" or "c7" option, only c1e. C6 is core parking, not sure if that's having an impact on your cpu or not. Setting windows to high performance in the power options 'should' disable/prevent core parking.

 

[nvidiafanboi]

i will try all your suggestions later this evening and post my results. thanks for all your help mate.

 

[nvidiafanboi]

Thank you so much for your help buddy. it was the windows power options. i just upgraded to win 10 and completely forgot about that option.