Ultra brand 600w power supply - adequate? Safe?

I got an Ultra brand 600w PSU about 3 years ago but never used it. I'm considering using it for a new build:

-Core i5-750
-HD 4890 (possibly getting another one for Crossfire)
-4GB G.Skill Ripjaw 10666 RAM

Basically, I have 2 questions:

1) Is Ultra a reputable PSU brand or should I play it safe and buy a new PSU from Antec, Thermaltake, etc?

2) Is 600w sufficient? What about if I run it in Crossfire?
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More about ultra brand 600w power supply adequate safe
  1. Whats the current rating on the 12V rail? The best i could find for an ultra 600W was 37A which isnt good for a 600W unit, and certainly is not crossfire capable for 4890s, a good 700-750 with atleast 60A is generally recommended for crossfire, it keeps you well inside the efficiency range for the PSU.
  2. 12v1 is 18A and 12v2 is 20A. I'm not sure what that means, I don't know much about PSUs. It's an Ultra XFinity PSU. The box claims that it's SLI-ready.

    The PSU in my old build is an OCZ GameXtreme 700w, but it's heavily used and full of dust.
  3. So best case scenario its got 38A, likely a few less, thats still pretty weak for a 600W PSU as a good 550W unit is expected to have atleast 40A. For a single 4890 the Ultra is fine, however for crossfire you should definitely upgrade.

    Being SLI ready doesnt mean too much, because you can technically SLI 2 9600GTs, it wont take much power so it would be fine, but it isnt what most people expect with SLI.
  4. Ahh I see. Would it cause damage of any sort if it doesn't supply enough power to my system? Or would it just not power on?
  5. It depends, a good PSU will just shut off if you try to draw too much power from it like if you were playing a game, a bad PSU will self destruct if you try to draw too much power from it, there is a lot of middle ground between the two but im not sure where that ultra sits in there. It would probably just shut off but you can never be sure.
  6. BTW, here's the dusty PSU I was talking about. It's got four 12v rails, 3 at 18A and 1 at 20A. The repair center that I took my old PC to for a diagnostic test said that it seemed to work fine, but the power dissipated abnormally slow.

  7. The OCZ can provide a maximum of about 56 amps at 12 volts. The OCZ is a much better PSU. I'd take it apart and clean all the dust out and use it.

    If you are going to use compressed air, hold the fan so it doesn't freewheel. That can damage a fan.
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