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I have a HP DC7100 sff and have added a GeForce 8400 515mgb video card, 2Gb ram, sound card and a dvd burner w/lightscribe. My question is should i replace the 24watt power supply with a higher power unit?
i mean 240 watt.
How much power is necessary for PC systems ?
For your reference, following are details that illustrates approximately how much wattage you will need to run various common components in a PC system ( the components are on the left and the wattage required on the right):
The Motherboard: 15-30
Midrange to high-end CPU: 40-100
RAM: about 7 per 128MB
PCI add-in card: 5
High-End graphics board: 60-100
IDE/SATA hard drive: 10-30
Optical CD/DVD drive: 10-25
So let's calculate a system with a powerful motherboard, a (High-end) CPU, 4 Gigs of RAM, 3 PCI cards (including the 2 (high-end) graphic cards), 2 hard drives and 2 optical drives.
That would be 30+100+224(128MB X 8 X 4 = 4Gigs @ 7 per 128MB)+15(3 X 5)+200(2 X 100)+60(2 X 30)+50(2 X 25) = 679
So compare your computer specs with the list and do your own math, you will then know what PSU you should get.
NOTE: Leave yourself a bit of slack in your calculation for future hardware - Example: As calculated above, I would consider a PSU of at least 800 Watts and get up to 850 Watts if the price difference is slight.
Hope this helps you
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