#ryzen 5 5600x

Hello peeps, recently i bought the Sapphire RX 6700 XT Nitro+ graphic card. The installation of it was fairly simple the drivers were installed properly and so on. Nevertheless, i came upon the conclusion that the GPU is underperforming in games like Overwatch(which rlly was a buffling example)...

I was planning to pair ryzen 5 5600x with MSI b450 pro vdh but i want to know does b450 supports pcie 4.0, I know b450 don't supports 5600x straight out of the box but i can download the bios in usb from my friend's computer, also, people on the internet have have been running 5600x with...