2500k @ 4.5ghz - OC not showing up in CPU-Z or in BIOS?

[ELCID777]

I'm new to OC, hell, I'm new to gaming PC's. But as the title suggests, I'm a bit confused as to why the OC I just did through bios is not showing up in programs like CPU-Z, and when I restart and enter bios, my CPU appears to have defaulted to stock settings at 3.3ghz.

Motherboard is P8P67 pro. To OC, I simply set the CPU multiplier to 45, turb ratio to buy all cores, and set CPU voltage to 1.25 (it was at 1.081 at stock). I saved the settings, restarted the PC and checked with CPU-Z but it the OC does not seem to have taken effect as the core speed it at 1600.2mhz. Shouldn't it read 4500?

What did I do wrong?

[enaberif]

Go back into windows and do something cpu intensive.

[keto]

Yup, it downclocks by default at idle or very low usage by design, this is a good thing. Run Prime95 and see what CPUZ reads. I'm guessing your computer will crash, 1.25v is not enough *likely*, I told you 1.36v to try. You can try though, it might run.

Also, I only told you to change your turbo multis. The 'regular' cpu multi you leave at stock (I think it's 33).

[ELCID777]

Well, like I mentioned, I'm totally new to this. I don't think I touched anything in the turbo numbers.

I set my OC according to this guy who has the same set up.

Overclocking i5 2500K to 4.5 GHZ with ASUS P8P67 Pro - YouTube

Let me know if I should tweak or undo any of these.

Oh, and I just adjusted the CPU voltage to 1.30, just to be safe. It's currently at 1.312v according to CPU-z.

[Ed103194]

Run prime95, and open cpuz to check the core speeds again, set your voltage to 1.35v

[tyreman]

Post a screenshot of prime 95 64 bit version to BTW after your system has run overnight with those voltage settings
Here is a 24 hour screen of mine