PCIe 3.0 vs 4.0: What’s the Difference and Which Is Better - MiniTool ...
At present, there are x1, x2, x4, x8, or x16 lanes available in a single PCIe slot. For instance, PCIe 3.0 x4 refers to a Gen 3 expansion card/slot with 4-lane configurations.
PCI Express - Wikipedia
Technically speaking, an eGPU enclosure can serve as an PCIe expansion chassis, as most of them feature slots for at least one PCIe card.
What are Small PCIe x1 Slots Used For? - CGDirector
Many modern laptops and small form factor PC’s (and even some full-size PC’s) come with one or more Mini PCIe slots on the board for adding Wi-Fi cards or mSATA SSDs and these can often be used to add additional PCIe Ethernet cards instead.
Best PCIe chassis expansion for Mac - AppleInsider
Máy tính công nghiệp không quạt DS-1102 7/6th Generation Intel® Core™ i3 / i5 / i7 High Performance, Modular and Expandable Rugged Embedded Computer with Two PCI/PCIe Expansion Slots Hoạt động liên tục 24/7 Bảo hành 24 tháng.