R515 memory upgrade

Hi, I have a R515 with 2 CPU's and 64GB RAM (8x8GB LV RDIMM's).

I am looking at upgrading the memory a bit.

Can I mix memory sizes?? ie. 4x 8GB and 4x 16GB LV RDIMMs??? as the manual only has the option of 8x16GB as an upgrade.

So slots A1, A2, B1, B2 = 8GB modules and  slots A3, A4, B3, B4 = 16GB modules giving me a total of 96GB 48GB per cpu??

Thanks,