Q6600 muliplier stay at 6 in Vista 64, changes in Vista 32

Hi,

First post here, and I've not been able to find any relevant info by searching. No answer to this question on a couple other BBs either. Here goes ...

I have a dual-boot Vista / Vista 64 setup. Both Home Premium. I just noticed that in the 64 bit, when I test with prime95 (64 bit) the multiplier stays at 6 even while all the cores are at 100%. In 32 bit Vista the multiplier sits at 6 when idle then jumps up to 9 when I run prime95, as you'd expect.

Motherboard is an Asus P5Q Pro. In the BIOS - multiplier is [Auto], C1E, Virtualisation, TM, Execute Disable and Speedstep are all Enabled. Of course the BIOS settings are the same for 32bit or 64bit OS.

I'm reading the actual multiplier from "coretemp" while testing, but I think its reading correctly as the temps are lower when testing under 64 bit suggesting that the CPU's running slower.

Is there something in Vista 64 that I need to set? I have the chipset drivers installed.

Currently I'm overclocked to 345 x 9, but I get the same behaviour at stock FSB of 266. Vcore is currently manual at just over 1.2v, but again the behaviour is the same when set to [Auto] which gives a bit over 1.3v.

Any ideas?

Thanks in advance, TonyS

Maybe your performance profile in vista 64 is in saving energy mode and not for balanced performance mode.

xD

No prob men

All the ppl seams to have any kind of problem with the multipliers with Intel cpus...