nah, sandybridge did 5 ghz, ivybridge did 4.8 and haswell does 4.6
and not all of them either, only about 30 percent of haswell-k processors will hit 4.6
on the plus side, because of increased ipc, all these processors are about equal with full overclocks
it was theorized devils canyon would overclock well because of "improved tim" but early results are not promising. at this point im thinking they may just get binned better than a 4670k, and therefor more of them would hit 4.6ghz but we will see.