Bought a 2.66 i7 MBP off craigslist(just purchased in January '11 with 3 years Applecare. got a great deal, but that's beside the point.) By all of my research, the i7 2.66(620M) is a dual core processor. I purchased this knowing that - figured it'd be an upgrade to my 2.26 C2D regardless. Oddly though(and this is what I'm confused about). In Activity Monitor and iStat Menu, it shows four bars/sections being monitored. Any idea why? Seems strange to me.