LAST EDITED ON Mar-27-01 AT 06:36 PM (GMT)
"Rule of thumb; if last letter of an AMD CPU part number is B=200 FSB or C=266 FSB
There is a BIG difference in these devices, as the BUS_FREQUENCY_MULTIPLIER
is hard-wired on the device..."
"At any rate, using the A1200AMS3C device with a 200 MHz FSB will give a CPU
speed of 900 MHz.
(1200/266*200 = 902) the BIOS will actually report the 900 MHz speed in this
case, even though a 1.2GHZ processor is in the socket!!!
Similarly, all other Athlons, which are available in both 200 and 266 FSB's
have this same characteristic.
Example, the OPNs for the 1.2G Athlon are:
A1200AMS3B for an Athlon1.2G with 200 MHz FSB
A1200AMS3C for an Athlon1.2G with 266 MHz FSB"
See http://www.amd.com/products/cpg/athlon/techdocs/pdf/23792.pdf for more info.