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

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Essentially, PCIe is a data transfer bus The purpose of any bus is to offer a standardized physical structure -- the slot and electrical contacts

PCI Express x16 — Sixteen lanes, largest slot *some slots may not have matching lanes in bandwidth, more on this throughout the article  PCI vs PCIe Slot · PCI-E x16 slot: It is 89mm long and has 164 pins It is often used for graphics cards and backward compatible with x1 x4

where is the gold slot game PCIe bifurcation is no different to the definition dividing the PCIe slot in smaller chunksbranches Example, a PCIe x8 card slot Each lane can transfer speeds around 250 MBs and each slot can be scaled from 1 to 32 lanes With 16 lanes, PCI Express supports a bandwidth of