My Video card says it needs XX amps to run correctly, my PSU has YY amps per rail, can my PSU run my Video card?
The amperage stated by the Video cards manufacturer, is not the amperage necessary to run just the card. The manufacturer is recommending a PSU with at least that many amps total for the whole system. If your PSU has 4 rails of 18A each, that means potentially you have (18 x 4) amps available total. The actual number will be lower, depending on the total wattage rating of the PSU.
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