Visage seems to be using x/1024*n to get up to Gigahertz (treating it like it's Gigabytes)
7419199488 hertz == 6.91G ? Not really.
This is probably what you'd want when showing bytes, but all other high values should use x/1000n to convert to Mega, Giga etc.
Per a conversation with @jessereynolds, I've changed the default value formatting from base 2 to base 10, as base 2 formatting seems to be required in the minority of cases.
dd2521a also add support for specifying the base you render with, which will be useful for nicely converting network device octets to megabytes.