Istanbul Demoed, Let's Drink Soda

[m^2]

??

IBM xSeries scale to 16 sockets for Xeon ( older variants could do 32 sockets, not sure if this is still true ) .That is 96 cores.
If Nehalem EX based XSeries sticks to the same line , there would be 128 cores with 256 threads.Unisys offers a similar box with Dunnington, 16 sockets for a total of 96 cores.

From the looks of it , SGI will build a large Altix based Xeon, imagine 512 sockets with 8 cores/16 threads per socket.Problem is if they will be around when Beckton launches.

Yeah, and Newisys Horus scales to 32 sockets (previous generation Opteron).
Cray Jaguar to thousands.
I meant only what the platform offers, not how others extend it. Such modifications are never mainstream and usually cost much more / socket.