This brings me back to LGA775 - or more specifically, when I wanted to insert an LGA771 CPU into that socket. Cutting off the notch in the motherboard's socket

This brings me back to LGA775 - or more specifically, when I wanted to insert an LGA771 CPU into that socket. Cutting off the notch in the motherboard's socket was something I never thought I'd do! Oh and before anyone goes off trying this, you do need to swap two pins - you can buy a conductive sticker online to make it easy. I just upgraded to i7 6 months ago - you'd be surprised how well a Xeon x5470 (4 cores @ 3.33 GHz, 12MB cache) can stave off the need to upgrade. I'm not a gamer, though.