Even old DDR-200 (aka PC-1600, 1600 MB/s)[1] is faster than the theoretical maximum of SATA III (600 MB/s). Wikipedia says SATA 3.2 can reach 1,969 MB/s, but the more recent DDR3-1600 is 12,800 MB/s and some DDR4 reach 21,300 MB/s [2] ... SSDs aren't even close.
DDR4 also theoretically supports 512 GB sticks [3] Can't wait.
1) http://www.crucial.com/usa/en/support-memory-speeds-compatab...