How any components will a 550w power supply support

i got an i7 2600k, evga gtx570hd video card, WD 7200rpm black caviar hard drive, 2x 4gb ddr3 ram, a n asus p8z68 vpro mother board and a toshiba dvd-rom drive.
i was wondering if my ultra 550w power supply would be enough for that and if i would be able to put 2 more hard drives on.
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More about components 550w power supply support
  1. If this is your ULTRA it has too small a +12 volt rail Same applies to the old X2 connect 550watt
  2. yea i ended up just buying a new one at best buy ><
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