PSU with HD5770

Hi, I'm planning to build a gaming computer and I would like some help to choose a good PSU and how much wattages I need. Here are the specs:

RAD HD5770 1024M single card
AMD PHENOM II X4 945 3.00G/3800/8M/AM3
AM3 ASUS CROSSHAIR III FORMULA AMD790FX ROG
CORSAIR 1333 MHZ DDR3 6GB XMS3
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  1. One last question, what does it do if my PSU has to much wattages, for example I buy a 750 W when I only need 600 ?
  2. all the wattage rating means is that (for example) 750w is the max amount of power the psu can output. but if your computer only is using 400w at a given time, then that means its only outputting 400w...
    iow its fine :)
  3. so if I'm planning to leave a door opened for upgrading cards or using crosshair/sli, I should get something with more wattage then ?e
  4. That Antec NEO ECO 620C 620W PSU that shovenose recommended to you will have plenty of power for 2s HD 5770 video cards.
    Or enough power for one of the new next generation big video cards - think HD 5870 replacement.
    It's a very good choice.
  5. Ok thank you for your time guys.
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