How do I know what wattage power supply I need?
The internal components of your PC determine what wattage power supply you need. Below is a list of common components and their watt usage. This is only a guide with all wattages estimated.
- ATX Motherboard - 30W-40W
- AMD Athlon 900MHz-1.1GHz - 50W
- AMD Athlon 1.2GHz-1.4GHz - 55-65W
- Intel Pentium III 800MHz-1.26GHz - 30W
- Intel Celeron 700MHz-900MHz - 25W
- Intel Celeron 1.0GHz-1.1GHz - 35W
- Intel Pentium 4 1.4GHz-1.7GHz - 65W
- Intel Pentium 4 1.8GHz-2.0GHz - 75W
- 128MB RAM - 10W
- 256MB RAM - 20W
- IDE CD-ROM Drive - 20W
- IDE DVD-ROM Drive - 20W
- SCSI CD-RW Drive - 17W
- SCSI CD-ROM Drive - 12W
- 5400RPM IDE Hard Drive - 10W
- 7200RPM IDE Hard Drive - 13W
- 7200RPM SCSI Hard Drive - 24W
- 10000RPM SCSI Hard Drive - 30W
- AGP video card - 20-30W
- PCI video card - 20W
- Floppy Drive - 5W
- Network Card - 4W
- Modem - 5W
- Sound Card - 5W
- SCSI Controller Card - 20W
- Firewire/USB Controller Card - 10W
- Case Fan - 3W
- LED Case Fan - 6W
- CPU Fan - 3W
We have also come across this website which will help you calculate the amount of wattage your PC will use.