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Required amps on 12V rail?

Last response: in Graphics & Displays
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August 15, 2010 2:23:19 AM

Does the the amperage on the 12V rail from the PSU need to exactly match the requirements of the video card? I have a 500W PSU with 18A and a PCI-E 6+2 connector I'm trying to decide on a low-end card for some moderate gaming.

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a c 202 U Graphics card
August 15, 2010 2:28:41 AM

The ratings of the PSU are just what is available, components only pull what they need. The ratings on the GPU are always for the system as a whole and they test with a pretty high end system.

Now does your 500W unit only have a single 12V rail at 18A? If so you definitely need to upgrade that because its weak for a 350W unit.
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a b U Graphics card
August 15, 2010 2:30:39 AM

No, but 18A is pretty low for a 500W, are you sure it doesn't have multile rails for 12v?

For you (if you really have only 12A), the best card I would suggest is a HD5670.
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a b U Graphics card
August 15, 2010 4:50:46 AM

What kind of PSU?
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a c 376 U Graphics card
August 15, 2010 4:54:12 AM

Yes, tell us the brand and model. Unless it is ancient you are incorrect about it having just 18 amps on the +12v.
Even if it is a poor 500w you can likely use at least an HD5770.
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