Re:CPU Driver Problem? (Score 2, Informative)

Actually, a "CPU Driver" would probably contain code to handle specialize features of certain CPU's. For example, in order to take full advantage of Hyperthreading, you would need different code to distribute threads between the two virtual processors. Likewise, there could be additional code to take advantage of extended instructions sets like MMX, SSE, 3DNow, etc. At the very least, it could contain information about which features are available in the CPU.