Pci Express Specifications -

Tip: Always check your motherboard manual. While the slot might physically fit, the electrical lanes are often shared. For example, plugging an NVMe SSD into a certain slot might cause your top GPU slot to drop from x16 to x8 speeds.

| PCIe Version | Raw Bit Rate (GT/s) | Encoding | | x16 Bandwidth (≈) | Year | |--------------|--------------------|----------|-------------------------------------|-------------------|------| | 1.x | 2.5 GT/s | 8b/10b | 250 MB/s | 4 GB/s | 2003 | | 2.x | 5.0 GT/s | 8b/10b | 500 MB/s | 8 GB/s | 2007 | | 3.x | 8.0 GT/s | 128b/130b| ≈985 MB/s | ≈15.75 GB/s | 2010 | | 4.0 | 16.0 GT/s | 128b/130b| ≈1.97 GB/s | ≈31.5 GB/s | 2017 | | 5.0 | 32.0 GT/s | 128b/130b| ≈3.94 GB/s | ≈63 GB/s | 2019 | | 6.0 | 64.0 GT/s | 128b/130b + PAM4 | ≈7.56 GB/s | ≈121 GB/s | 2022 | | 7.0 (draft) | 128.0 GT/s | PAM4 + FLIT | ≈15.13 GB/s | ≈242 GB/s | 2025 (est) | pci express specifications

| State | Description | Power | |-------|-------------|-------| | L0 | Fully active, transmitting data | ~100 mW/lane (Gen3) | | L0s | Low latency standby (≈1 µs resume) | ~10 mW/lane | | L1 | Higher latency standby (≈2–4 µs resume) | ~1 mW/lane | | L2 | Auxiliary power only (wake-up capable) | ~1 mW total | | L3 | No power, full cold reset | 0 mW | Tip: Always check your motherboard manual

| Form Factor | Lanes | Use Case | Hot-plug | |-------------|-------|----------|-----------| | | x1, x4, x8, x16 | Desktops, servers | No | | M.2 (Key M) | x2, x4 | NVMe SSDs, Wi-Fi | No | | M.2 (Key E) | x1 | Bluetooth/Wi-Fi cards | No | | U.2 (SFF-8639) | x4 | Enterprise SSDs | Yes | | ExpressCard | x1 | Laptop expansion | Yes | | Thunderbolt 3/4 | x4 | External enclosures | Yes | | OCuLink (SFF-8611) | x4/x8 | External GPU/storage | Yes | | CEM (Add-in card) | up to x16 | Graphics, accelerators | No | | PCIe Version | Raw Bit Rate (GT/s)