Okay, let's talk specs.
I was wondering at first why Mark Cerny said that 825 GB are the "most natural size" for a 12-channel interface, although 825 does not divide very well by 12.
But gigabyte and terabyte are based on the decimal system (1 terabyte = 10^12 bytes = 1,000,000,000,000 bytes) and not on the binary system like RAM (1 tebibyte = 2^40 bytes = 1,099,511,627,776 bytes).
And 825 gigabytes = 768 gibibytes (or to be exact 768 gibibytes are 824.633720832 gigabytes, rounded up to 825 GB).
768 Gibibyte divided by 12 lines = exactly 64 gibibyte per channel.