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When hooked up to a motherboard’s PCIe x16 slot, a card such because the GeForce RTX 4080 can draw as much as 75W from the +3.3V and +12V rails (3.3V x 3A + 12V x 5.5A). That is the utmost quantity laid out in the PCI Categorical usual for a x16 slot (PCIe 4.0 and 5.0 spec). If a graphics card calls for extra capability, it’ll normally have extra capability connectors to provide the vital power.
Plugging a 6-pin PCIe capability connector into the graphics card supplies as much as an extra 75W, and an 8-pin connector trade in an extra 150W.
Some of the key updates within the PCIe 5.0 specification comprises the advent of the 12VHPWR capability connector, which is able to provide as much as 600 watts of capability via a unmarried connector.
PCIe x4 and x8 playing cards can draw as much as 25W from the motherboard’s slot, day x1 playing cards are restricted to 10W until configured as a ‘full-height’ or ‘high-power card’ to drag the aforementioned 25W.