i can mine with it, its just very slow and inefficient. anyways, something weird happened. i changed the flags and turned on the CPU affinity, and the speed shot up to 3GHash/s then slowed down to 996MHash/s... wtf?
even still, i get nothing in the "accepted" and nothing shows up in the pool website. and after a while the mining speed just stays on one number and doesnt change
You cannot CPU mine, especially with a Sempron.
CPU mining is worse than mining with nVidia, neither should be done by sane individuals.