645 KiloBytes (KB) = 5160 Kilobits (Kb) = 5 Megabits (Mb) = 0.63 Megabytes (MB)

If you have change to MB instead of Mb then you are correct.

Just as a comparison, the average DSL connection is 384 Kilobits or 512 Kilobits.

So if you do the math, Jimmie's 5160 kilobits / 512 kilobits = 10 times the difference or 13.5 times in faster in the case of 384 kilobits.