Keeping in mind the advent of desktop based quad-core processors in the mainstream, it was just a matter of time before they showed up in a mobile version too. This was confirmed by Digitimes, which goes onto say that Intel will be planning to launch its first quad-core CPU for notebooks, the Core 2 Extreme QX9300, in the third quarter this year. This new processor will be manufactured at 45nm and have a core frequency of 2.53GHz. The CPU will support FSB speeds up to 1066MHz, include 12MB L2 cache and have a maximum TDP of 45W. Despite the low heat dissipation of these processors, they will be a lot more power hungry as compared to standard dual-core processors and this will directly affect battery life.
source:tech2