I upgraded my 4-core 4,1 to a 6-core 5,1 a few years back, and enjoyed the experience. Now, however, I'm doing more and more video editing in 4K, and 6-core just wasn't hacking it any more. I started watching auctions on eBay, and recently scored a bare-bones dual 4-core 2.4 gHz mid-2010. I also scored a couple of X5680 chips for $75 each on eBay, and tonight I put it all together. Now I have a 12-core 3.33 gHz machine with 1.5 TB of SSD and 7TB of HD space. A 30-second video that took 4 minutes to compile in Premiere now compiles in one minute flat. Call me happy.