The first PCIe specification, version 1.0, was released in 2004, with a bandwidth of 2.5 GT/s (gigatransfers per second). Since then, the standard has undergone several revisions, with each new version increasing the bandwidth and improving performance. The current PCIe standard is version 6.0, released in 2021, which offers a staggering bandwidth of 64 GT/s.
The PCIe standard specification has several key features that make it an attractive choice for high-speed interconnects: pcie standard specification
GT/s (Giga-transfers per second) is not the same as Gb/s. Due to encoding overhead (e.g., 128b/130b in PCIe 4.0/5.0), the effective data rate is slightly lower than the raw transfer rate. The first PCIe specification, version 1