Very nice though, if I had a p4 I would probably do the same. Around here in the summer, (colorado) It gets pretty hot for just air cooling.. around 100 degrees during july and august. I put my old 2000+ pally through hell last year, using just stock AMD heatsink and 1 dinky 30cfm case fan. it idled at ~75 degrees So any sort of way to get a little cooler temps I'd go ahead with it.
THE POINT IS YOU TOTALLY VOIDED YOUR WARRANTY FOR A 2C TEMP DIFFERENCE. Are there people that anal that they need to do that?? I could understand a heatsink but damn I want some chance to rma if I needed too. And lapping the cpu has been done for years so its nothing new sorry for you newbs