Its time to revisit the the question, “How much compute/ RAM can we get in a 42U rack ? ”
…and 256GB of RAM * 40 machines = 10240 GB of RAM i.e. 10TB !
Given the SPARC road map, and the likely doubling of the core count (achievable following a die shrink to 25NM) for T5 chips, we could see a doubling of that thread count!
Its interesting to think that these machines can saturate 10GBe easily with plenty of CPU time to spare. This in mind, that would be 80 * 10Gbe ports, so you’ll need some decent network equipment to keep all those machines fed!