My last CPU was the longest I've ever went without upgrading. It was and still is a good one. AMD Opteron 180, dual core @ 2.6ghz. I couldn't get it past 2.8 stable on an Asus A8N SLI-Deluxe, so it stayed at 2.8 for 3 years. Only reason I never upgraded was because it was just about the best you could get for the 939 socket (DON'T START, LET IT STOP THERE).