What does the X4 mean in an PCIe Gen X4 NVME drive?

The SSD should work because the _2 slot supports both NVME and SATA but the speed will of cause be lower than the main _1 port Another

I do have some doubts though on power draw requirements over x4 PCIe since A2000 doesn't

pcie x1 in x16 slot x16 PCIe slot supporting x8 PCIe Gen4 Key M slot with x4 PCIe Gen4 x4 + 3 x1 USB*, USB Type-C connector

pcie 50 x16 slot x4, x8, or x16 lanes available in a single PCIe slot For instance, PCIe x4 refers to a Gen 3 expansion cardslot with 4-lane configurations