Probably the speed of the modules, the mbw[1] tool does copies to do its measurement, so the close proximity and reduced copies in the OS wouldn't be factors.

Probably the speed of the modules, the mbw[1] tool does copies to do its measurement, so the close proximity and reduced copies in the OS wouldn't be factors. [1] https://github.com/raas/mbw https://github.com/raas/mbw