Pcie Specifications -

PCI-SIG is finalizing electrical specs, but the next frontier is optical PCIe (expected around 2026–2027). This will:

The specification is the standard interface for connecting high-speed components (GPUs, SSDs, network cards) to a motherboard. Managed by the PCI-SIG (Peripheral Component Interconnect Special Interest Group), the specification defines physical dimensions, electrical signaling, and protocol layers. pcie specifications

*PCIe 7.0 specification v0.7 was released in early 2025 for member review; full release is expected by late 2025. PCI-SIG is finalizing electrical specs, but the next

| If you have... | Upgrade to Gen 4.0? | Upgrade to Gen 5.0? | | :--- | :--- | :--- | | Gen 3.0 motherboard + Gen 4.0 SSD | – double SSD speed | Not yet (minimal gain for storage) | | Gen 4.0 motherboard + RTX 4090 | No | No (GPU doesn't saturate Gen 4.0 x16) | | Data center AI accelerator (H100) | N/A | Yes – Gen 5.0 x16 cuts training time | *PCIe 7