650w Antec Earthwatts enough for crossfire?

So I have a 650w Antec Earthwatts power supply and I have a hd 5770 hoping to get another one to crossfire? Does it have enough power to run both?

This computer build is probably about 2 years old btw.

Windows Ultimate x64
2x2 G.Skill ripjaws 1600
650w Antec Earthwatts
AMD Phenom II X4 955 Black Edition
HD Radeon 5770
Antex two-hundred black mid tower case

Oh and I might also want to install 4 more gb of ram into my computer. Anyone have good suggestions I would love it.

Ty :D
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More about 650w antec earthwatts crossfire
  1. Best answer
    Yep. Should be just fine and you'll have no problems.
  2. Would the heat be severe? or is it still okay to get another 5770 because I heard it's really tough with 2 gpu's.
  3. Not really. Just fill up all the possible case fans slot in the antec 200 and setup custom fan profiles for the GPU fans. It'll be fine.
  4. Before you buy any PSU you should read accurate, objective PSU reviews at reputable sites such as or on the EXACT model PSU that you are interested in as some brands have good and poor quality PSUs.

    You can also get an accurate rating of how much PSU power is required for your current or future system at the PSU calculator link below. Once you know the total PSU watts required then you need to confirm that the 12v rail has enough amps. to support your Vid card(s) and the rest of the PC system.

    There are several websites that show the Vid card power consumption in watts. Divide the watts by 12 to determine the amps. required on the 12v rail(s). Add 15 amps for the rest of the PC on the 12v rail and you now know the Minimum total 12v rail amps required under full load. It's best to have at least 5-10 amps. reserve on the 12v rail available under full load so the PSU is not loaded to 100%.
  5. Best answer selected by slashobeint.
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