On XPS 600, I have always felt that Maxtor 250GB harddrive that came with my Dell XPS 600 was the bottleneck. Whenever I do any resouce intensive tasks, the harddrive keeps running even if CPU and memory ultilization is very low. I looked up some specification for the Maxtor and noticed that it was an older generation. It looked like upgrading the harddrive will be the biggest improvement that I could make the system faster; however, there were a couple of options. I could purchase a brand new drive with higher capacity, or I could purchase the same capacity drive and configure a RAID 0 stripping array. I decided to go with RAID route since I have been doing daily backup to another older harddrive - I considered only performance factor.