While I assume that the fastest CPUs nowadays are fastest period, I'm in a position where specialized, but dated, software I use is only single-threaded in nature. More cores put up better numbers in benchmarks, but I assume raw clock speed is more what I should be looking toward. What consumer level CPU promises me best, or at least the sweet spot vs cost, single threaded performance? Is it the current leading i7? Or maybe something from AMD? And, should I look into things like disabling hyperthreading or even disabling a few of the CPU cores to give headroom to the others? I'm not interested in overclocking because I need these machines to be as stable as possible.