They don't make nearly as much of a difference, I was just concentrating on the main ones.
based on that fact alone I would give it a higher benifit rating than the sse support.
And data prefetch works better on some applications than others. The Athlon's data prefetch also doesn't make as much of a difference as the P4s, for reasons I've given before.
I'd definitely say SSE makes a bigger difference.
I can guarantee you that a lot less than 99% of apps have SSE.So you'd rather have a technology that helps 1% in all applications, rather than one that gives a 300% boost in 99% of apps?