Originally Posted by directfiesta

Anyway, bandwith you are at 1500 / 3000 gigs a month ... This means 5 mbps/ 10 mbps .
You need a decent amount of memory, probably 4 gigs would be OK. As for processor, a high power Core2 Duo ( or better Core2 Quad ) should handle the load.
As for disk, a raid setup would increase a bit the performance.
So, in your case, a dedicated is required.