A technician is setting up a desktop workstation for video editing. The motherboard features one primary PCIe x16 expansion slot wired electrically at x16 and a secondary full-length PCIe x16 expansion slot wired electrically at x4. The technician installs a dual-slot PCIe x16 graphics card in the primary slot. Which of the following components can be installed into the secondary expansion slot without encountering physical keying or mechanical fit issues?
- A PCIe x4 dedicated network interface cardCevap
- BA legacy PCI sound expansion card
- CAn M.2 2280 NVMe solid-state drive directly inserted into the slot
- DA dual-channel SO-DIMM memory expansion module
Cevap
A PCIe x4 dedicated network interface card can be physically and operationally installed into the secondary full-length PCIe slot.
PCI Express expansion slots support backward physical compatibility. A card with fewer lanes (such as a PCIe x4 card) can be physically inserted into any larger mechanical slot (such as a x16 slot). Because the secondary slot is wired electrically for x4 speed, the x4 network card will function at its maximum rated bandwidth.
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PCIe Mechanical vs. Electrical Lane Compatibility