Originally posted by: SH
I've read SSE4a (supported by K10 and K10.5 AMD CPUs) is nothing to do with SSE4.1 (supported by Intel 45nm CPUs), right?
Correct. You can see the list of SSE4.1/SSE4a instructions here
and see what instructions go with which processor.
Now, wich applications make use of SSE4.1?
Right now, very few. Some encoding programs have beta support for it, though. If you compile your own code, you can compile SSE4.1, SSE4A, or SSE4.2 support.
Will those applications perform better on an Intel CPU just because they support it?
From what I've seen, yes, to some degree.
Will future AMD CPUs support SSE4.1?
I don't know.