Intel's new 'Haswell EP' based Xeon processors are some serious workhorses, packing an insane 18 cores - for a total of 36 logical cores when Hyper-Threading is taken into consideration. This is the new Xeon E5-2600 v3.
To get here, Intel had to do some great work under the hood, with 45MB of L3 cache helping it all out. Latency and power consumption become a big issue with a 36-core processor, but Intel has done it, all while AMD has no new CPU architecture until 2016. The new Intel Xeon E5 processor comes in 22 SKUs, ranging from a 3.5GHz quad-core model all the way up to the 18-core 2.3GHz chip.
Just in case you didn't see, William has posted up an article covering this total beast of a new CPU from Intel.