For example, a single link PCIe 3.0 interface has an 8 Gbit/s transfer rate, yet its usable bandwidth is only about 7.88 Gbit/s.
Uses 128b/130b encoding, meaning that about 1.54% of each transfer what is control cable ([Full Posting](https://capdiensaigon.xyz/2021/04/03/cong-dung-chinh-cua-cap-dieu-khien-sangjin/ "Full Posting")) used for error detection instead of carrying data between the hardware components at each end of the interface.
Uses PAM-4 encoding and a 256 bytes FLIT block, of which 14 bytes are FEC and CRC, meaning that 5.
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