> Ok, I'll ask - I am well aware of how AltiVec functioned. And no > argument that an Intel-written SW may not properly run on a PPC to > take advantage. Honest question though - Doesn't Intel have a similar > functioning SIMD unit? Also 128bit wide? If that's the case, I'd > expect that a 4x2.8GHz machine to be 4.48X as fast as a 2x1.25GHz > machine, given the similarity between both SIMD units. The near 10X > improvement I see proves your point, to me, at least, that the code > was not optimized for PPC, specifically AltiVec. I have the latest DVD > rip I'm sending to a TiVo, will run on both machines to confirm exact > ratio I see.
You're right - Intel does have a competing technology called SSE. You can read more about it here, though don't ask me to translate into English: http://en.wikipedia.org/wiki/Streaming_SIMD_Extensions I've never seen a performance comparison between Altivec and SSE, though it would make an interesting read. Eric -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
