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I was wondering if it would be possible to upgrade the CPU in my old eMachines T3990 PC, since my current one can't easily handle what I would like to do on my PC. (My processor is a 3.20 GHz Intel Celeron D). Celeron D seems to use the 478 Socket and the only other processor made for that socket was the Pentium 4 (which is discontinued). Any ideas?