Yes, this is on a single 8GB 2667MHz DIMM in a laptop.
edit: For dual channel RAM, I would suspect the throughput depends on how the kernel decides to map physical memory to virtual addresses.
edit: For dual channel RAM, I would suspect the throughput depends on how the kernel decides to map physical memory to virtual addresses.
By default, whenever the memory modules used in all different channels have the same size, e.g. two 8 GB modules, the firmware maps the modules with interleaved addresses, to ensure a double throughput for 2 channels, or triple/quadruple/etc. for workstation/server motherboards with more memory channels.