NikKTech checked out the Seasonic VERTEX GX-1000 Power Supply Unit
A quote from the article:
The VERTEX GX is the very first ATX 3.0 and PCIe 5.0 compliant line of power supply units by Seasonic and on my test bed for the past week I've had the rather impressive 1000W variant.Seasonic VERTEX GX-1000 Power Supply Unit Review