PS What about support for SSE2
Isn't that supposed what the Optimized Pentium 4 Build and P4 Fred2 Builds means ?. Doesn't Athlon support also Intel's SSE and SSE2 ?, it does, but it performance its worse compared to Intel processors, even so if that build if Compiled using Intel ICC Compiler (which I don't know if it is), I wouldn't use it if I have an Athlon.
Does anybody in the planet know of a game or application that use SSE3 instructions?
Not, even Sandra, which is a Bechmarking Program use it, it just use SSE2 Intructions for Performance/Becnhmarking Tests, and just a simple Test to see if the processor supports SSE3. It's one of those features that make me wonders why it exists...