Let see---did he say anything about changing to a Celeron II 667. No. He asked about a Celeron 533, probably in an older motherboard that will not support a Coppermine or anything less then 2.0 volts. If you are going to respond to a post, please answer the question the person asked. If you do not have personal knowledge of the question, do not respond. Writing twenty sentences about a subject then ending with "I think" or "I'm not sure" doesn't do us any good. RRRRRRR.