Re: What is the difference between CPU speed and Clock speed?
266MHz is the speed of the bus, as Intel are Quad Pumped, so effectively makes 266X4 = ~1066MHz which maximum (theoretical) your processor can have. but, yours is Northwood, and they had 200Mhz (200Mhz x 4 = 800Mhz FSB). your motherboard has capability of speeds up to 1066MHz (266 x 4) as told before.
now CPU speeds are calculated by the Clock and Multiplier, like in your case, your CPU is showing 3GHz (3000/200 = 15) or 200Mhz (FSB) x 15 (Multiplier) = 3000Mhz / 3Ghz
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"