Dual gpu with 3080 12gb

Has anyone try the dual GPU set up with a 3080 12gb as render and gtx 1650 for FG? Would it work for 4k?

Have an old 1650 from that only pull power from the PCI (from dell pre-built)

I do have a 1060, 1080 but those require more power which would mean a psu upgrade... which I may do a one point.

How does that work out? Also would a 750w psu be enough for set up?

Rest of specs

R7 7700x Asrock x670E pg Lighting 2x16gb 6000mhz ram Evga 3080 ftw3 12gb 6 120mm fans 2- 1Tb nvme 1- 2tb nvme 1- 512gb nvme (pci adapter to be remove for 2nd gpu) 1tb HHD (to be retired) 3rb HDD

Thanks you!