and yet both sony and MS could have done this if they thought that was a good idea, if they wanted to blow 50 watts of their TDP they could have run there 8 cores @ 2.4ghz, thats 50/33% ( depending which way you want to count) more perf.
Math just doesn't work that way, 2.4GHz is either 50% more than 1.6GHz or 1.6GHz is 33% less than 2.4GHz. There's only one way to count that.