I had a very old B3 stepping Q6600 from March 2007, it hit 3.2 ghz at 1.4 volts. Great CPU for its time, but there is no comparison between it and the i7 3770k, the 3770k simply blows it away. BF3 performance is much better on 64 player servers. WoW NEVER dips in framerates, even in the most chaotic PvP battles. Same for Starcraft 2 custom survival maps where you fight like a million enemies lol. Encoding is twice as fast. It's just a much snappier CPU, uses a lot less power, and is a more modern platform. However, if you don't feel the upgrade crunch, don't do it just for upgrading's sake. Haswell is coming out next year, the next tock in Intel's release schedule, and that should bring some very interesting new features to the table.
Main system: Core i7 3770k @ 4.4ghz, Gigabyte GA-Z77X-UD5H-WB, 16gb Corsair DDR3 1600 RAM, EVGA NVIDIA Geforce GTX 680, 2x 1tb Samsung Spinpoint F3, Kingston 64gb mSATA SSD
Tablet: iPad 3 32gb
Phone: Galaxy SII