PCIe 3 vs 4 for Gaming GPUs and SSDs

2 Slot is from the Ryzen 7 5700G then it will only support PCIe Found this tech site that explains that a Motherboard can have both PCIe and slots

Yes, PCIe standards are thankfully backwards compatible, meaning that a PCIe device will work in a PCIe slot, but it will only be able to reach PCIe

pcie 20 x1 slot Ans: Yes, PCIe and PCIe are backward and forward-compatible This means that devices and components designed for PCIe can work in PCIe slots,

pcie x4 in x16 slot The real advantage of the PCIe interface over SATA is the ability to transmit data on up to four lanes, whereas SATA only has one When combined with an NVMe