FSB anges som 200 MHz vilket blir 800 MHz när man anger det i Quad.
Utdrag från en FAQ:
"My CPU says that it has a 266, 333, 400, 533, or 800 BUS speed, how is that?
Newer CPUs now "double pump" or even "quad pump" the FSB, this is similar to how DDR memory works. For example, the 333Mhz BUS on a processor take a 166Mhz FSB and "double pumps" it. 166Mhz FSB x 2 = 333Mhz
Similar to that, the 533MHz BUS processors are "quad pumped". 133MHz FSB x 4 = 533MHz"