archaelus

Note to self: Must find out if Erlang runs on Octeon MIPS64 chips, because if it can then there are lots of options for high density computing.

8 Cores / U
You can already buy standard 2U boxes with single Octeon chips (16 cores) in the Lanner MR-950 or the Movadis Revolution X16 box - this works out to 16 Cores per box for 8 Cores / U. (Or a Portwell KLIN-6030 or KLIN-6020)

16 Cores / U
Upon closer inspection of the datasheet, the X16 has a 1U option for the same 16 chip. Bah, too easy.

32 Cores / U
Can we go to 32? I could get all the cores/rackunit in the world by sticking Lanbird NS0216s into a 2U AdvancedTCA chassis (example from ELMA). That's something like 64 MIPS64 cores in 2U of rackspace.

Portwell sells a 5U 5 ATCA card chassis which gives 32 Core / U.

Or with AMC format gear you could take a 2U 4Slot Chassis and stick 4 Radisys Promentum AMC-7211 cards into it. This again gives 32 cores per unit of rackspace. Can we do better?

64 Cores / U
24 Radisys AMC Cards in an Artesync EMC6200 gives 64 Cores per U (6U chassis)?

Anyway, enough drooling over ludicrous numbers of processors. Back to work.