Then it should be GB.s or GBs. GB/s gives a different meaning. For example I could use 600 GB in the first second, then 400 GB in the second second. All togeth

Then it should be GB.s or GBs. GB/s gives a different meaning. For example I could use 600 GB in the first second, then 400 GB in the second second. All together its 1000 GB.s, at an average of 500 GB/s for 2 seconds. This is not perfect because kilowatt is a rate so kWh is a quantity. But GB is already a quantity. So a GB.s doesn't make sense either. It would need to be an equivalent memory rate usage × time in order to get memory quantity. Like avg GB/s × s.