If you like it fast get 2 WD 36.7 Gig 10,000 rpm hard disk and set them up as RAID 0 configuration. Also as you have read, PC2100 only has a frequency of 266 Mhz which creates a bottleneck with a FSB that is 400Mhz; always buy RAM that matches your motherboard FSB frequency. Many company sell complete systems with RAM that actually slows down the system. Once you find out about that, if you want RAM that matchs your motherboard, you have to buy them. Always ask what is the bus frequency and memory frequency; that if were you see that some dealers are "get rid of their slower memory. Memory wise, the lower the cas latency (time it takes to react, the faster or better it is). That is why two same PC3200 may be $50 or even $100 different for 512 Meg for instance.