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Am I Crossfire ready?

Hi Guys :) A couple months ago I built this system:
AMD Athlon II x3 445 [Unlocked to Phenom II x4 B45, overclocked to 3.7GHz by increasing to about 240 x15.5]
Radeon HD 5770, not overclocked
Asus M4A79XTD Evo. Supports Crossfire at x8/x8.
Kingston 4GB [2x2GB] DDR3-1333 RAM
Samsung Spinpoint F3 500GB
Zalman CNPS9700NT Cooler
Antec 300
Corsair VX-550W PSU


I built it as such so that I could add a second 5770 in the future... but I think I should've gotten a different PSU e.g. Antec EA-650W or something for crossfire.


Do I have enough power to add in a second 5770? The eXtreme Power Supply Calculator recommends a PSU of at least 440W to me, but that sounds awfully low, even though the 5xxx series are pretty good regarding power usage.

And for reference, yes I would be willing to undo the CPU overclock or even just re-lock the 4th core and L3 cache if it would help me.


Thanks!
5 answers Last reply Best Answer
More about crossfire ready
  1. The PSU is good for CF, you can keep the CPU as it is.
  2. Best answer
    5770s are very light on Wattage. Each one has a TDP of only 160W (Maximum) so to Xfire that'd be 320W leaving 230W for the rest of the system. I believe the chip only uses either 65W or 95W, so that still leaves at least 125W. And since it's a Corsair PSU, it will reliable give you all 550W

    So to answer your question, go head and Crossfire!
  3. I guess that's as straightforward as it gets, thanks for the help guys :)
  4. Best answer selected by rzilla91.
  5. Thanks for the best answer. Should be my 50th for a silver badge :)
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