It's strange, cpu-z detects the change in multiplier, so far everything from 9.5 - 11 has worked. The calculation done by cpu-z on the total speed of the cpu is correct too, but my FSB can only go up to 217 MHz, regardless of multiplier. Basically I could set the multiplier to 9.5 yet my FSB won't go further than 217.
So far, it looks as though the multiplier change is having an effect, unless cpu-z is really messing with me...
ASUS A7N8X-E Deluxe
AMD Athlon XP 3200+
OCZ 1GB Platinum PC3200 Rev2 Dual Channel
ATI Radeon 9800 Pro
Enermax Noisetaker 485W
2 x 80GB SATA Maxtor Diamondmax 10 on RAID 0