On my Asus A7N8X if you use a factory default mulitplier and bus speed then it picks upon the chip type an displays it:
So if its 12.5 x 166 is shows as an XP2600
if its 11 x 133 its an XP1700
But if you deviatefrom it, then it shows the CLOCK SPEED.....
10 x 166 = 1666 XP
but the odd exception is running 12.5 x 180 (my current default thanks to my Mushkin) where it CONTINUES to show XP2600+
even though What Clock speed confirms my 2250 cpu speed.
Funny old world innit?