Has anyone done any benchmarking/testing to see if -march=686 makes any difference? I suspect the GPU probably matters more than the CPU? Usually binaries have to work on the base CPU instruction set for an architecture, IIRC that is 486-level instructions for i386. I imagine detecting CPU support for SSE at runtime is an acceptable way to make one set of binaries. -- bye, pabs http://wiki.debian.org/PaulWise