Without attaching additional power cables, how much can a PCIe x16 graphics card draw from the motherboard’s slot?

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 persistent, it’s going to normally have further persistent connectors to provide the vital power.

Plugging a 6-pin PCIe persistent connector into the graphics card supplies as much as an extra 75W, and an 8-pin connector provides an extra 150W.

Probably the most key updates within the PCIe 5.0 specification comprises the creation of the 12VHPWR persistent connector, which will provide as much as 600 watts of persistent via a unmarried connector.

PCIe x4 and x8 playing cards can draw as much as 25W from the motherboard’s slot, whilst x1 playing cards are restricted to 10W except configured as a ‘full-height’ or ‘high-power card’ to tug the aforementioned 25W.