"K" cpus have one advantage for me... I mean it's really much more easy to sell cpus after binning. I remember C2D E8xxx, i7 9xx (Bloomfield). For instance it was very hard to sell E8500-E8600 cpu, the same with i7 940, 950, 960... everyone wanted to buy "cheap" E8200-E8400 chip or i7 920... and binning low multi chips wasn't so good for LN2 (I mean total highend). Now it's good, I order only 1-2 models of each generations (like 2500K, 2600K, 3570K, 3770K, 4670K, 4770K, 3930K, 3960X) and there is a demand for those cpus cause normal cpus are lemons, for 24/7 non oc use only for simple users, and those rarely build their own computers from parts now.