My friend has a Pentium II 350 on an Abit BX6 rev.1 mobo and he asked me if he put in a Celeron 533 PGA, if it would be faster than his PII 350...i'm guessing that it would be equivalent to a Pentium II 450 or so...am i close or way out in left field??
The only difference between a Pentium 2 and Celeron of the same clock speed is that the Pentium has more on board cache than the Celeron. So it depends on what you're doing, but generally the Pentium is much faster since having a big on-die cache can speed processing up tremendously. The Celeron was created as a low-cost alternative to the Pentium 2, since on-die cache is (or was) very expensive.
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So a best guess then is that a Celeron 533 will be equivalent in "processing power" of a Pentium II 400 then? ( I used 25% because the difference you gave me between 350 and 466 is about 25%), wouldn't be much of an increase, bottom line is he wants to be able to run the current games on the market without putting any money into his system and some of the newer games have steep system requirements on processor, so maybe a 533 celeron would get him another 6 months or so eh?