There’s a new system on the block here at Oracle: the X4-8
Cut a long story short, there is 6TB in 5U (120 cores, Xeon E7-8895 v2)
In a 42U rack, that works out to be 48TB of main memory and 960 cores!
You can find more information about this system here:
https://blogs.oracle.com/hardware/entry/oracle_s_sun_server_x4
