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PSU Wattage??

I have noticed a lot of people askin whether a PSU will have enough power to keep their PC alive

Most of the time I give them a copy of this text file, but here it is in plain.
Simply add up the different bits, I usually use the high end values. Then add about 100W just to make sure.

AGP video card - 30-40W
PCI video card - 30W

AMD Athlon 900MHz-1.1GHz - 50W
AMD Athlon 1.2MHz-1.4GHz - 55-65W
AMD Duron 1.0MHz-1.3GHz - 50W
AMD Athlon 1.47MHz-1.73GHz - 75W
Intel Pentium III 800MHz-1.26GHz - 40W
Intel Pentium 4 1.4GHz-1.7GHz - 65W
Intel Pentium 4 1.8GHz-2.0GHz - 75W
Intel Pentium 4 2.2GHz-2.4GHz - 90W
Intel Celeron 1.0GHz-1.1GHz - 35W
Intel Celeron 1.2GHz-1.4GHz - 50W

ATX Motherboard - 35W-45W

128MB RAM - 10W
256MB RAM - 20W

Optical Media
24X or higher IDE CD-RW Drive - 35W
32X or higher IDE CD-ROM Drive - 25W
10x or higher IDE DVD-ROM Drive - 20W
SCSI CD-RW Drive - 17W
SCSI CD-ROM Drive - 12W

Hard Drives
5,400RPM IDE Hard Drive - 10W
7,200RPM IDE Hard Drive - 13W
7,200RPM SCSI Hard Drive - 24W
10,000RPM SCSI Hard Drive - 30W
15,000RPM SCSI Hard Drive - 45W

Floppy Drives
Floppy Drive - 5W

Expansion Cards
Network Card - 4W
Modem - 5W
Sound Card - 5W
SCSI Controller Card - 20W
Firewire/USB Controller Card - 10W

Case Fan - 3W
CPU Fan - 3W

I've attached the file as well

If people have more up to date info on DDR Ram, CPUs and GFx cards let me know and I will add them


So basically my 250 watt PSU that came with my computer wont be able to handle all my hardware (I reaalized lately that the computer wont shutdown standby or restart) Im concerned though I went to compaqs site and they dont have any info on upgrading my PSU all they have are replacement parts.
you should be able to get a Enermax or Antec PSU which should handle your needs, or goto Compaq site, and look for a shopping section. They might have more powerful PSUs there. Check the dimensions of your compaq PSU it should be the standard size, but you never know.

I dont actually know what standard size, is. Mine is about 8.75 tall and 14.5 long, the width would have to be pretty much the same for PC case widths.


I checked there site, and the PSU's that they have are direct repacements they have no upgrades, I'll be contacting customer support to see what they have to say.
Thanks for the quick reply.


so in that case I need 400 w of psu, right now I have 300w antec. My pc working great o/c cpu and 9700 pro. but when I attach a little 12v fan on mobo the da*e asus probe(when I turn it on) keep showing up with the Voltage meter where the 12+v is over 13.184 points(After I disconneted the fan).

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