milktea :
universal remonster :
pjmelect :
"2.0GB/S = 20Gb/S (aprox).
No... it doesn't. By using your math we could also say that 80% = 100% (aprox).
8bits in a Byte would be 2GB/s = 16gb/s, making it less than three times faster.
I believe SATA spec Gb/s is stated in 2^30 bits/s instead of 1x10^9 bits/s. For SATA3.0, 6Gb/s actually does give you 600MB/s taking into account for 8b/10b and some extra headroom. So I'm not surprise that SATAexpress 2GB/s is indeed 20Gb/s.
First of all, binary units are almost never used when talking about communication speed,
The M and G here are metric not binary.
Also,
SATA 3.0 channel speed: 6Gb/s
SATA 3.0 actual data speed: 0.6GB/s not 0.75GB/s because of 8b/10b encoding
PCIe 3.0 channel speed: 8Gb/s per link
PCIe 3.0 actual data speed: 1GB/s per link because it's using the more efficient 128b/130b encoding
SATA Express = 2 lanes PCIe 3.0 = 16Gb/s = 2GB/s