p.s. AMD already has 6-core CPUs:
http://www.tgdaily.com/content/view/37323/135/
http://news.softpedia.com/news/AMD-Updates-6-Core-Lineup-with-Five-New-Processors-116498.shtml
Sunnyvale, California-based Advanced Micro Devices has just announced a number of new processors, coming to complete its latest line of six-core Opteron chips, formerly codenamed Istanbul. These new models have been designed to provide customers with a choice for a high-performance processor that can also improve the energy efficiency of their high-end systems. There are five new models, in AMD's 6-core lineup, with three aimed at 2P servers, while the other two have been designed for 4P/8P servers.