Aren't Katmai P3s locked? So your board couldn't change the multiplier even if it wanted to. It could be that the board is just detecting (and reporting) the multiplier wrong, maybe because it is older than the CPUs? Anyway, you could test (with benchmarks) if your CPUs are actually being underclocked... perhaps only the ones with unlocked multipliers are.

Sounds like some sort of "fail-safe" feature where the FSB and multiplier revert to a default setting when the BIOS detects a CPU change. It is a bit annoying, but harmless.

JayCeeBee64 wrote:

Sounds like some sort of "fail-safe" feature where the FSB and multiplier revert to a default setting when the BIOS detects a CPU change. It is a bit annoying, but harmless.

+1

Check your battery, it might be low. Past that its actually a USEFUL feature if you are an overclocker. Considering its an AOpn board, I would venture a guess it does cater to overclocking.

I have three of this board. Firstly there are a ton of revisions, but all of them act "funny" when you swap the processor frequently. I always do a full CMOS clear / reset when changing hardware on this board 😀

But otherwise it's a great board.

Thats good to know 😀 Guess I'll just have to remember to make some multiplier changes after cpu switches. Not planning to make any fow now anyway. Thaks for the info.

The board is jumperless, but has some BIOS options for FSB and whatnot. But it never hurts to do a CMOS clear 😀 I did remove all the slot brackets however, because one day I struggled removing a processor and got frustrated 😊

Depends if the cpu was so-called 'multiplier locked'? also, what
Revision of the motherboard AX6BC (and maybe bios) you have...