PCIe (PCI Express)

PCIe (PCI Express) is the high-speed serial interconnect used inside computers. Components such as GPUs, NVMe SSDs and network cards connect through lanes that carry data in both directions.

Why it matters

Speed depends on the generation and the number of lanes. Each generation roughly doubles the per-lane bandwidth, and slots are labeled x1, x4, x8 or x16 for lane count.

If a device plugs into a slot with fewer lanes than it wants, it works but may run slower.

You can check the negotiated link in tools such as lspci or the vendor's utility, which show the generation and width actually in use.

Example

PCIe 3.0 x4: about 4 GB/s
PCIe 4.0 x4: about 8 GB/s
PCIe 5.0 x4: about 16 GB/s

A PCIe 4.0 NVMe SSD in a 3.0 slot works but is limited to the lower figure.

Common mistakes

• Assuming a physical x16 slot always has 16 lanes wired.
• Putting two NVMe drives on lanes that are shared with other slots.
• Ignoring that the chipset link can bottleneck several devices.

Related

• NVMe
• GPU
• Motherboard
• Chipset

यह पेज सामान्य जानकारी है, जिसे हमारी संपादकीय टीम ने लिखा है और दस्तावेज़ीकरण बदलने पर अपडेट किया जाता है। सर्वर और प्रदाता अलग-अलग होते हैं, इसलिए बदलाव पहले सुरक्षित तरीके से जाँचें। देखें: संपादकीय नीति और अस्वीकरण.