I used the chrome orb that came with my T-Bird 850 MHZ on my P3-800. I have an Alpha for my T-Bird, and the chrome orb is better than the POS that I had on my P3. It was a direct fit. You are "going the other way" however, so be careful. Test-fit it on the socket without the CPU installed to see if it lines up, so you don't end up cracking the CPU.