I just thought I'd post this for other HB users out there and what I am noticing. Before getting this i7 iMac that suits my spatial and work needs better than my 2009 Quad MacPro i figured the 2.8 GHz would see a slight benefit over the 2.66 in the MP. Well it is more than a slight benefit. With the MP I could never get HB to use more than like 75% of each of the 8 virtual cores or 600% total. With HB on the i7, I am getting about 740% CPU usage, about 92% per core. On the MacPro I got about 50-60 fps on the iMac I am getting 75fps with other programs running and 100+ with nothing going. My temp is at 154 F, so we'll see how long it can sustain itself.