Power Supplies: Standard Outputs

Most PSs provide 3 levels of output voltage at various amp ratings:

• AGP vid card (not available from older AT PSs): +- 3.3 V, 14 A
• ISA bus (At Bus) adapter: -5 V, 0.3 A
• Mobo, CD/DVD, HDD, PCI adapters, P III and earlier: +5 V, 30 A
• "Soft" power switch (ready-to-start mode) : +5 V, 0.85 A
• Older network adapters and serial ports: -12 V, 1 A
• Cd/DVD drives, HDDs, P4 and Athlon cpus, Mobo.
  

Note that more devices draw +12 V power than any other range. Therefore, make sure your replacement PS has enough +12 V connectors.