Is there a way to determine if my slots are running x2 or x4 lanes?

m 2 slot with pcie x4 lanes
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Now I am also using a GTX 1050 TI GPU with it So if I Install a NVME SSD, as far as I know that B450 mobo dont have its own PCIE x4

Generally speaking, the number of lanes supported by a PCIe device is represented as follows: x4 means 4 lanes, and x8 means 8 lanes Taking the ADATA

m2 expansion slot Most of those cards are x16 and their switches split to x4x4x4x4 But there are x8 cards with 4 sockets which then split to x2x2x2x2 Check

m2 slot types If you connect a NVME SSD to a PCIe x4 slot it will have a higher maximum bandwith than if you connect it to a 1x or 2x slot So logically it