Well, right now I'm in a transitionary phase. I have a A64 3000+ / MSI K8T800 and the Mushkin 512MB RAM. I've got a 60GB and a 40GB ATA100 hard drives (don't even know if they have cache) running from my old P3 1GHz computer and a Ti4200 128MB from my old comp as well. Compaired to that rig, the new is nice. Once things are loaded (games, photoshop, etc) the comp is very snappy. Loading times have been rather slow though, which prompted me to buy 2 SATA 120GB 8MB cache drives which I plan to RAID 0. Hopefully that will help the load times. Games such as Warcraft 3 are running beautifully smooth with the new processor, whereas in large battles on the P3, it was a little clunky. I've been having problems with my Ti4200 crashing (it is RMAed) and ordered a BFG 5900 which should be in next week. Once that and the hard drives are in I will be able to give a definative opinion on my new rig.
HOWEVER, compaired to my 2.6GHz Xeon (HT = on) at work, also has 1GB RAM, 120GB HD ATA(not sure if it's 100 or 133 or cache size), and a matrox G550 card it seems slow on load times, things like programs opening and start menu loading. I'm really hoping it's the hard drives, and not the RAM or some other factor, but I guess I will find out shortly. I don't regret my upgrade though. I'll gladly take a stock A64 3000+ which beats out a P4 3.0 / 3.2GHz chip than a P4 2.6 / 2.8 GHz overclocked all the time to get P4 3.0/3.2 like speeds.
-Nate