i7 2700k Throttling?

[xSystemFailurex]

I'm trying to get more out of my 2700k. I'm currently in windows @ 4.5ghz with voltage set to auto. CPU-Z however, is showing my multiplier is at 41 as i run IntelBurnTest. Hottest core in RealTemp is 75C. Any idea why my proc thinks it needs to run at 41 multi when I tell it to run at 45 and put load on it?

 

[Falkentyne]

While I don't recommend internal CPU stress/QA testing utilities like Linpack being used while overclocking and raising vcore (Linpack can cause degradation, heck even prime can, at 1.4v+), and I don't know your bios settings, see if you can disable OS multiplier control so you use a fixed multiplier for all cores, and maximize the power and amp and current limits (like, set them to 300 if possible). Also disable TM monitor.

 

[Forceman]

As Falkentyne mentioned, it may be the current limiting it - normally there is a BIOS setting that you can change, it normally reads in percent, so changing it from 100% to 120% or something might help.

It does run at 45 sometimes though?

 

[paperwastage]

its current limiting or TDP limiting

if you don't care (have a good board with good power phases (6+2?)), then set the current limit to 99999 and TDP short/long to somethign like 300/300W

otherwise, current limit of 250 is fine, TDP short/long limit to 140/130W (IBT will require more than 130W at 5ghz. PRime requires ~115W at 5ghz)