How much power do I need?

I know, I know. I read the sticky, but I am just lost. My brain glazes over when so much foreign info tries to cram its way in. Here is my config:

Processor: Core 2 Duo E6750 (On 7/22)
Case, 3 fans (1x 140, 1x 120, 1x 80) plus several LEDs built-in
Video Card, Geforce 8800GTS 320MB PCIE x16
RAM, 2 sticks of 1gb DDR2 800
One SATA HDD, A DVD-RW/DVD+RW drive, maybe a sound card, and probably a PCI slot fan. PS2 Keyboard and mouse of course. USB headphones.

I have the XPS calculator Pro, and I can't entirely figure it out. Is it a high-end or regular desktop motherboard? What's with the SLI vs Crossfire, are these both dual card setups? What's a high performance fan?

I guess I'd prefer to err on the side of caution.

I'm sorry to be a bother. Thanks in advance to anyone who can help.
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  1. As much as you can afford. :)
  2. Thank you.

    With the worst case scenario, the calc is telling me I need:

    Recommended PSU wattage: 352W (Can this possibly be right??)
    +3.3v: 7.2A
    +5v: 13.1A
    +12v: 21.9A

    Minimum UPS rating: 503VA
    Recommended UPS rating: 600VA

    The wattage sounds awfully low, can it be right?
  3. It can very possibly be right, however you may want to account for capacitor aging, I think it suggests 15%... Most systems do not draw as much power as people would expect, but its good to have the extra headroom because as the PSU gets older output can decrease.

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