P4A/B/C/E ???

[aReda]

Why are P4’s rated with letters and what do they stand for? I know that the Prescott is an "E" but how about the others? Just some clarification and explanations please.

Thanks,
Red

[osprey4]

I think it has to do with the FSB speed. The A runs on a 400-MHz FSB, the B runs on 533, etc.

[VHockey86]

the a/b/c refers to the revision/relesae of the pentium 4 chip. As osprey already started, the main changes the FSB. As with all p4 chips, they run at 4 times the motherboard fsb, thus
"a" ran at 400mhz, mobo at 100mhz
"b" ran at 533mhz, mobo at 133mhz
"c" ran at 800mhz, mobo at 200mhz

the "a" chips were more or less a flop, b was a good improvement, the c chips are actualy pretty damn good (waits for beatdown from all the amd fanatics).

I've never heard the term "e" yet but im assuming thats the new prescott release which has 1MB of cache rather than 512K, for increased performance. So far its had little increase in processing power but are projected to get better in the near future