To be really pedantic, there's a big difference between 'memory bandwidth' and 'memory transfer speed'. The former is just reading (or writing) to a block of memory, and the latter is copying data from one location to another. So a 'memory transfer speed' is going to be slower.
"Memory bandwidth" is being used in marketing materials today, so it's a little useful to understand what it means. (The author of this article confuses it with memory transfer, probably others do as well.)
