Intel released the quad core on Nov 14, 2006. Read it here. They actually started shipping the quad core that day. http://www.intel.com/pressroom/archive/releases/20061114comp.htm
AMD does it on Nov 30, 2006. And it is not really quad core. They are just 2 dual core CPU on the same motherboard. Read here. http://www.amd.com/us-en/Corporate/VirtualPressRoom/0,,51_104_543~114483,00.html?redir=dtfx04
Intel had that for a long time. Even Apple computer had dual core dual CPU Mac Pros using Intel Dual Core CPUs for a long time now. Introduced in Aug 7, 2006.
Where did this guy come from? Can you believe that this guy writes for PC Magazine?
There seems to be no accountability for blabbering fan boy stuff (or utter ignorance) on reputed (or is it any more?) publications like this.
The guy writes on day when Intel is secretly showing 8 core machines using 2 quad core processors on the same board. This is almost at the time when AMD is able to show only a 4 core system using 2 dual core processors. Amazing journalism.