Multi-rail PSUs aren't absolutely required mate...he just needs minimum 24amp current for 12v...18amps would be a minimum 12v rating for running an AMD64 if that's where you're pulling that number fromThe Neo Power is Antec. Wattage isn't everything. high systems such as this should be supported by a power supply with dual 12V rails with 18 AMPS or more on each. Sure he can go more, but at the moment he doesn't HAVE to.