I now have a dell gx270 optiplex with a p4 2.4 ghz northwood cpu with a 800 fsb and 512 k L2 cache. also it is socket 478. i want to replace it with a Intel Pentium 4 3.0E Prescott 3.0GHz 1MB L2 Cache Socket 478. i am looking to purchas one from new egg and in the reveiws one cust stated he had...