Bus Clock: 266 megahertz. on a Bus Clock 1066MHz What Does this mean?

[themrspeedoist]

Operating a "Intel D975XBX2" the link is for the Intel processor strange when after running "Belarc Advisor" Bus Clock: 266 megahertz. The Intel specs say 1066MHz; where does the Bus Clock: 266 megahertz come from if it is Bus Clock: 1066MHz? How is this number 266 possible?

http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=2643933

 

[Freestone]

The 1066MHz bus speed is derived from the base clock of 266MHz (actually 266.66... MHz) being "quad-pumped" (266.66 MHZ x 4).

http://en.wikipedia.org/wiki/Quad_Data_Rate

http://www.directron.com/fsbguide.html