Power supply Wattage needed for a computer?

I'm thinking of building my own computer, and can't determine what power supply I'll need to run it. I've created two setups, based off of whether I want to cut corners a bit more (and suggestions for changing the setups would also be nice).



The first setup consists of

Core 2 Duo E7200

nVidia 9600GT

500GB or so WD Caviar

DVD Drive (maybe a burner too)

G.Skill 2x1GB rated at 2.0 or 2.1V



And the second setup with

Athlon X2 4600+

nVidia 8600GT

-- the rest same as above.



Any help in how to determine how large a power supply I'll need would be extremely helpful. Thanks.Power supply Wattage needed for a computer?
I second sj's suggestion for the Corsair 450W. It's actually overpowered for your setup by 50%, but at least it's an 80-Plus-Certified high-quality unit.



The first answer had some good figures for the power draws, but some of his numbers are woefully outdated. With the 1.8v-2.2v DIMMs we use today, the DIMM modules don't draw more than 5 watts apiece. Two 1GB DIMMs will draw just a measly 10 watts. No memory today will ever draw up to 120 watts-- That would be emitting as much heat as a 120W light bulb.



The E7200 Core 2 Duo is a Wolfdale 45nm CPU and it will draw a measly 40W under load when run at stock speed and voltage.



The 9600GT is a very power-efficient card with a 95-Watt TDP.



Your peak maximum system draw would be around 200 watts.



You can actually run your setup on nothing more than a 300W PSU, but what the hey, I say go for that super-nice 80-Plus-Certified 450W Corsair.Power supply Wattage needed for a computer?
1st setup: 600W to 700W ATX PSU with at least 80% efficiancy and make sure it has SATA power connectors in case you need them.

2nd setup: You can get by with a 500W+ power supply. You may want to go ahead and get the highest wattage in your budget in case for future upgrades.Power supply Wattage needed for a computer?
Well both seem to be fairly good setups but here goes:

CPU w/mobo - 75-125w

Video card - 65-100w

Hard drives run -25-40w

Any cd drive -15-30w

Memory runs 7w per 128mb so - 112w for memory

PCI Cards slots of any kind -10-15w

But you want a 10% buffer for upgrades later. Your looking around 435w+43.5= 475w I would go with a 600-650w range this will give you a good upgrade path. Make sure if your HDD is SATA you will need a PSU that has sata power connectors. Then make sure it has the video connectors too most of the videos these days require seperate power for better results. ThanksPower supply Wattage needed for a computer?
This is all you need to run that rig. I build sell and repair computers and I'm suprised a %26quot;computer engineer with 20 yrs experience%26quot; thinks you need a 600 watt PSU for that rig. My Vista gaming rig Runs a dual core Extreme, 3 hard drives, an 8800GTS, ATI TV tuner, Creative sound card, floppy drive, 4GBs of XMS DDR2, 5 led case fans, 2 UV tubes and a Vantec Tornado 92mm cpu fan that pulls 14.5 watts all on a 550watt Antec. This 450watt Corsair will put most 600watt PSUs to shame and you'd have enought power to run a 9800GTX if you wanted to upgrade your card in the future. 600watts! LOLOLOL

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