photoshop cs3 plug-in filters and vso convertx dvd/br encoder, well thats the only apps I use that utilise the new instruction set and also support multiple cores. Probably more but thats the ones I use.
oh, nearly forgot solidworks photoworks 2008 has just implemented sse4 but Ive yet to try it out on my home pc, need to get a home licence from work 1st. Still only use 2007 which of course supports multiple cores.
hhmmmmm..........re-thinking the need for 4 cores..........
