I have a 166MMX (66Mhz bus) with 128M RAM running 98. Looking to get a newer bigger faster EIDE hard drive. What's more important: RPMs or cache ? Does it really matter since I'm still using a (relatively) slower 66Mhz Bus, or will performance of the hard drive actually be a factor ? I'm thinking of dabbling in some audio and video editing, which is why I'm even considering hard drive performance.