PCIe 4.0: Everything you need to know, from specs to compatibility to caveats | PCWorld
Which PCIe Slot is best for your Graphics Card?
Best Buy: NVIDIA GeForce RTX 3090 24GB GDDR6X PCI Express 4.0 Graphics Card Titanium and black 9001G1362510000
Amazon.com: ZER-LON AMD Radeon RX 580 Graphic Cards, 8GB 256Bit 2048SP GDDR5 1284/7000MHz, DP HDMI-Output, PCI Express 3.0 with Dual Fan for Office and PC Gaming : Electronics
Amazon.com: SHOWKINGS Radeon RX 580 8GB Graphics Card, 256Bit 2048SP GDDR5 AMD Video Card for Pc Gaming, DP HDMI DVI-Output, PCI Express 3.0 with Dual Fan for Office and Gaming : Electronics