wfgarnett3, by looking at the benchmarks you posted it looks like some of the other dc projects aren't as well written for SSE2. I'm mainly talking about "Seventeen or bust". That the project where Athlon64's were slower with SSE2. Not too long ago folding@home released another core I think it's fahcore_79 it's for SSE2. folding@home is different from most as each wu detrimends which core you get some use mmx, 3dnow or sse, and sse2. kind of pot luck but from asking around it doesn't appear that athlon64 does very good with the new core.