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4 +12v rails rated at 18amps each on a 700w can it power an ati 5770?

my psu is a rocketfish 700w rated at 18amps per rail and im just wondering if that can power a 5770 graphic card ?

also wondering if when buying a graphic card does processor matter in requirements for example if the requirements for the graphic card are 2.4ghz will it still work on a 2.2 ghz system? if not would that lead to a non bootable pc(as in doesnt even go to bios)?

And would a socket 939 motherboard with ati x200 chipset have any problems running it? as i know it is atleast a 5 year old pc im not sure if the mobo can handle such a new card
10 answers Last reply Best Answer
More about rails rated 18amps 700w power 5770
  1. The PSU is big enough. There have been some issues with older motherboards running PCIe 2.1 cards but not so if the card you get is PCIe 2.0. If you have a single core s939 CPU then the card is going to have a bottleneck. The higher clocked dual core the better.
  2. well its a dual core 2.2ghz system im getting a problem that when i install it to the mobo it wont boot now i dont plan to use the card long term as im actually building something with a new mobo and such but im jsut trying to make sure the card works and dont want to send it back if it does and i just did something wrong.... thank you
  3. a1l3 said:
    my psu is a rocketfish 700w rated at 18amps per rail ...

    Not true. It has 4 12 volt rails, each capable of supplying a maximum of 18 amps. Not the same thing.

    18 amps X 4 = 72 amps X 12 volts = 864 watts.
  4. so wait by saying 4 12 volt rails each capable of a maximum 18 amps is different from saying 18amps per rail?
  5. a1l3 said:
    well its a dual core 2.2ghz system im getting a problem that when i install it to the mobo it wont boot now i dont plan to use the card long term as im actually building something with a new mobo and such but im jsut trying to make sure the card works and dont want to send it back if it does and i just did something wrong.... thank you

    Do you have the last BIOS for the board installed?
  6. yes latest bios available that i can find for it
  7. Is it 2.0 card or 2.1 card?
  8. its 2.1 so im assuming its just the mobo
  9. Best answer
    Here is a review of your unit.

    http://www.hardocp.com/article/2008/05/13/getting_best_buy_on_power_supply/5

    It can provide 18A max on one rail. But the 12V source feeding all the rails can only do "42.42A". This is much smaller then 18x4. (which is well above 700W as jsc pointed out.) Read that review carefully. I don't think the 5770 will stress it, and as long as you don't have "brown outs" in your area you should be ok. But I wouldn't put a demanding card in there and would probably swap it out for a better PSU when I could.
  10. Best answer selected by a1l3.
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