[phire]

Not really accurate. The switch from NRZ to PAM4 actually massively increased the bit error rate. They switched away from the 8b/10b style line code and replaced it with forwards error correction.

PCIe 6.0 uses 256 Byte frames, with 242 Bytes of data, 8 Bytes or CRC and 3 Bytes of error correction.

So it actually has way more overhead than the older versions and their 128b/130b line coding, It's just at a slightly different layer.

[tux3]

Thanks! Did not know they added FEC, that makes more sense :)