10Mbps is 10 times slower than 100Mbps. When you have 100Mbps - that doesnt mean you can download at 100Mbps. It depends how many sites you plan to host, etc. If you have one site, then you could run it off of a P2 with 512MB RAM. If you have 50 sites or lower, 10Mbps would do. After the 50 or slow, you will notice differences, they are minor, but differences nonetheless. The ATA Hard Drive is good, it is faster than the 7200 RPM.