not all CPu work on the same socket: pentium 4 uses an 478-pin socket while the core 2 duo uses LGA-775 socket. Btw having for example an LGA-775 on your motherboard does not mean that every CPu with an LGA-775 socket can work. Take a look at the Core 2 Extreme Families, althoughthey are LGA-775, they cannot work on DP35DP which has an LGA-775 Socket.
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