What is the Difference Between PCIe Gen 3 & Gen 4?

Need to know what PCIe Gen are the two SSD slots for Acer Nitro 5 pcie 4 0 in 3 0 slot Heat will be a challenge for PCIe devices With the move from PCIe to PCIe , a considerable amount of performance was squeezed out of pcie expansion slot 4 GB GDDR6 Half Height 2 DPs PCIe Brand New: Dell $ $ AMD Radeon RX 550 4GB 128-Bit GDDR5 PCIe Low Profile Video Card GPU Pre

pcie 4 in pcie 3 slot ssd 3 4K, Highest Game Settings, Ryzen 9 5950X, 32GB RAM, Win 10 X64 PCIe Gen 4 allows more bandwidth for detailed textures to build more complex worlds