Base Clock Lower than Expected

[PapaSmurf6768]

This has been bugging me for a while but I've never really done anything about it. I have my 3570K overclocked to 4.5GHz 24/7 and it's completely stable. Problem is my base clock, although is set at 100 in the BIOS, shows up to be lower than that in CPU-Z.

Here's a screenshot of the CPU-Z window with this overclock:

Also, today I went for 5GHz on this chip with my new water loop, and I was able to get a validation off while the multiplier was set to 50 and base clock to 100, but it came out to 4.98GHz, not the infamous 5GHz. Is this a normal thing, and if not, what can I do?

 

[airdeano]

nope, my giggy, evga and msi all say the same 99.8 BLCK. even the evga e-leet and cpu-z
read the same.. just that tick short...
even if i clock .2 into the BLCK, it still show 99.8 shove another .1 and now im 100.1

airdeano

 

[Josh Weston]

Hmm, that is weird. I do sometimes get fluctuation when I look at my base clock on CPU-Z, but never that much.
May be worth giving the BIOS a flash?