The next time you plug in a graphics card or an M.2 SSD, take a moment to appreciate the quiet complexity behind that plastic slot. It’s not just a connector; it’s a ratified, rigorously tested treaty on how computers talk to themselves.
Marketing loves bandwidth (GB/s). Engineers love latency (nanoseconds). The spec carefully defines latency budgets for things like NVMe over PCIe. A GPU might not need 128 GB/s of bandwidth for a simple draw call, but it cannot tolerate a 1-microsecond delay. pcie specification
Bandwidth is only half the story. PCIe specifies mechanisms for low-latency communication: The next time you plug in a graphics card or an M
Don't look now, but PCI-SIG is already finalizing the 7.0 specification (expected 2025). It will double the data rate again to using PAM4. Engineers love latency (nanoseconds)
The is the technical standard maintained by PCI-SIG (Peripheral Component Interconnect Special Interest Group). This group—comprising giants like Intel, AMD, Microsoft, and Nvidia—votes on how data should move between the CPU/chipset and peripheral devices.
The newest specification (Gen 6.0) introduces PAM-4 (Pulse Amplitude Modulation) .