Since Half-Life 2 is ~2 GB (or 16 Gb) over the wire, we can serve up about a person/second with a complete copy of the game. These are idealized numbers - the real capacity planning numbers are quite a bit lower.
well i have enough specs for that3.0 ghz p4512mb pc3200 ddr sdram200gb 7200rpm128mb ddr geforce fx 5200