Demystifying the Frontside Bus
"To begin with, the frontside bus is the physical pathway between the CPU and the RAM controller. AMD64 (Athlon 64, Opteron, and Athlon 64-FX) processors have integrated memory controllers, meaning that there is no FSB, technically. Instead, AMD64 processors are measured by their bus speed, which is determined by the number of HyperTransport links that they employ. The frontside bus operates at a certain frequency. These days it's 400mhz, 533mhz, and 800mhz for Intel-based motherboards. A motherboard will generally support a range of FSB frequencies, although some of the later models will only do 800mhz due to other architectural constraints (a different socket type)."
(Submitted by Noel Wed Aug 25, 2004 )
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