Linda Walsh wrote:
"125MB/s is literally impossible with a 1Gbit/s line - there will be
overhead"
This comment is using the usual powers-of-1000 abbreviations for both the first figure (125 MB/s) and the second one (1 Gb/s), so it supports the assertion that powers-of-1000 are more common in ordinary usage. 125 MB/s is impossible is because there is some overhead at lower protocol levels, which means that you cannot possibly transfer 1 Gb of data over a 1 Gb/s line in one second, i.e., you cannot possibly transfer 125 MB of data over that line in one second, and that's what the comment says.
Google is a wonderful tool, and I'm sure that if you search hard enough you will eventually find uses of powers-of-1024 abbreviations for secondary storage capacity and transfer rates. But they're rare compared to powers-of-1000 abbreviations, such as the abbreviations in the example you gave.
