OK, yeah, I know, it's not an Apple thing. But I've just decided I'm in rather a good position to upgrade my folding machine, and have a few questions about the Athlon 64. 1. Main, killer all-or-nothing question: I have some old DDR333 sticks which are running with my Barton atm, and I want to save expense by re-using them. They won't clock up to 400, though, so would using them at 333 cause my CPU to fall back? 2. The 64-bit Windows beta. Worthwhile? 3. I'm pretty much decided upon socket 939, (a 3000+ actually) since it's current. The new 90nm Winchesters, exactly how cool, and how quiet are they? 4. Finally, do they deliver a visible increase in speed over and above their 32-bit counterparts? I've read Toms, but really want firsthand experience. Motherboards I can research, but there's so much crap out there regarding CPUs I'd rather hear it from someone. Cheers!