Hey, I'm looking to upgrade my dell dimension 3000 but i don't know if my PSU can handle it so i might need to upgrade my PSU also. I think the power supply is 250W. This will be the computer after I'm finished upgrading: -Intel Pentium 4 2.8GHz CPU -I'm using 2 optical drives - WINTEC 2GB (2 x 1GB) 184-Pin DDR SDRAM DDR 400 (PC 3200) (search Newegg for more info) - DIAMOND 2400PCI256 Radeon HD 2400PRO 256MB 64-bit GDDR2 (search Newegg for more info) -I'm also getting an exteral hard drive. Can someone tell me how much power this system will need? If you need any other info please ask.