Here is a review of Intel's Core 2 based quad core CPUs on TGDaily.
Intel packs two Core 2 Duo processors into one package. This poses several questions: How fast are four cores versus the not-exactly-a-weakling dual-core version? What will the heat dissipation and power consumption figures be like in a PC system with a quad core processor?
From a gamer's perspective, it seems the time for quad core processors isn't right because games are not optimized beyond 2 CPUs and some games like Call of Duty 2 wouldn't even run at all with more than two CPUs. Furthermore, most of the gaming results are bound by the graphics processors. But applications like H.264 video encoding and Windows Media Encoding which are highly optimized for multiple processors do extremely well on the new quad core CPU.