Intel Skulltrail Mobo....

AMD have dual and quad socket server stuff. Nothing really like Skulltrail though. However I think most consumers are better off with single socket motherboards, you really see a huge benefit going from 4 cores to 8? For most applications, no.

Of course if you're rendering 3D it's brilliant, but for general usage - nah. All those FB-dimms and stuff.
 
Don't know about AMD, but Intel does have dual Socket workstation boards (basically server boards with sound and without graphics). http://www.intel.com/Products/Workstation/Motherboards/S5520SC/S5520SC-overview.htm

The skulltrail was essentially a server/workstation board (desktop BIOS, but server northbridge -- 5400) that used Xeon 54xx chips. With Nahelem, the northbridge is basically no longer and instead is mostly just a cpu, QPI & PCIe bridge. Upside of the new workstation boards is 6 channel memory (1333 DDR3; can be unregistered and non-ecc but then not 2 DIMM per channel) when using 2 CPU (skulltrail was 4 channel FBDIMM DDR2 @ 800 = slow and very expensive).
 
AMD Opteron 6000 series boards have support for up to four CPUs with 12 cores each for a total of 48 CPU cores on a single board. I'm sure Intel has similar boards. Though very very few individuals would benefit from such systems, hence it remains in the server area of things.
 
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