AMD Terramar CPU has 20 cores
 

An archtecture that is only two years behind its schedule and that we will hopefully see in 2011 codenamed Bulldozer will expand to as many as 20 cores in 2012. This is of course assuming that there won't be any additional delays. According to AMD officials, the server version of Bulldozer is slated for introduction in the second half of 2011, which means the server part should show up before the end of next year.

http://fudzilla.com/processors/item/...u-has-20-cores