The PCIe Version Doesn't Matter for Graphics Cards Like You Think

So, I intend to build a sub $100 rig for light gaming I already have a GPU

While unlikely, some RTX 4090 buyers may still be on PCIe Gen 3 platforms, such as 10th Gen Core Comet Lake or Ryzen 2000 series PCIe Gen

pcie 4 ssd in pcie 3 slot The Matrox C900 PCIe x16 graphic card powers nine displays from a single That is, a device designed for Gen-3 PCI Express functions at Gen-2 speeds

pcie 40 gpu in 30 slot Power Phase, Chipset, Memory, Slots, Multi 13, Intel X299, 8 x DDR4 DDR4 4200+, 4 x PCIe x16 1 x , AMD 3-Way CrossFireX NVIDIA 3-Way