GPU suggestions

I am on Sequoia 15.1.1 and i need graphics card suggestion for my PC.

My Specs (almost maxed expect GPU)

Dell Optiplex 7010

i7 - 3770K (Ivy Bridge 3rd gen)

Ram - 32GB

SSD - 4TB NVME m.2 3.0 (Crucial) (on Pcie 2.0 Slot)

Wi-Fi - TP Link WN823N

Bluetooth - TP-Link UB500 (not showing other devices in settings but iMessage / SMS and Facetime / Cellular Calls works perfectly when my iPhone SE 3rd Gen near my PC IDK how)

Anyway I am thinking between RX 590 and RX 5500 XT (Both are exactly same performance) difference between them only generation gaps (Nano Tech).

I know RX 590 has Metal 2 and RX 5500 XT has Metal 3 Support but RX 590 based on interface PCI-Express 3.0 and RX 5500 XT based on interface PCI-Express 4.0 and my motherboard have only PCI-Express 3.0 slot and I think it will Reduce Speed / Performance of RX 5500 XT as compared with RX 590. (means after all exact same performance by both cards in actual RX 5500 XT will not give me same performance as RX 590 because of my old generation motherboard?)

Which one i choose? RX 590 (Metal 2) vs RX 5500 XT (Metal 3)

and also tell me if any visual differences on mac between metal 2 and metal 3?