I want to know what's the thing to do from adding 256M of 266mhz ddr to have 512M with windows XP or buy a raid controller to improve disk performance (I think that the raid is better), and what controller is best low budget.
If you do a lot of works on your pc that require frequent disk access (eg. video capturing/editing), then raid0 is the way to go. Promise makes good raid controller cards which you can consider.