On Wed, 2005-04-13 at 09:02 -0500, Justin Conover wrote: > I'm just curious if that makes a difference in speed on amd64, does > mtune=nocona affect the way k8 processors perform. Or do they for the > most part have little effect. The speed hit (if any) from -mtune=nocona on AMD64 is miniscule, which cannot be said for using -mtune=k8/opteron/athon64 with Intel EM64T processors, if I understand some of Jakub's past comments correctly. Basically, k8+EM64T is worse than nocona+Opteron. Jakub would be more authoritative on this issue though. Dan