I have attached an RTX 2080, which works wonderfully.

The power supply has four plugs for 6+2 pin PCIE connections (this is also stated in the product description under "Power supply connections"), whereby the power of the power supply is probably not sufficient if the full power is to be drawn via the four connections. However, the power is sufficient for a GeForce 3080. If you are unsure, Seasonic also offers a calculator for calculating the required power supply: https://seasonic.com/wattage-ca...