Sabrent Rocket 64GB (2x32GB) 4800MHz DDR5 Memory Kit Review
 

As the 16GB sticks, the 32GB versions of the Sabrent Rocket 4800Mhz U-DIMM memory modules have proven to be very overclockable and are the only way to go if you need both speed and huge capacity. By only raising the stock voltage to 1.25V, we managed to get 5800MHz fully stable and the modules barely got warm after the intensive TM5 stress tests.

http://www.madshrimps.be/articles/article/1001384/