I Can't find any hit for 12ghz P4. I thought the record is around ~8GHz (And you can push modern processors in that ballpark).

I doubt that even a 8GHz P4 would be able to beat a lower clocked more modern design even on single threaded integer workloads. The P4 had a lot of glass jaws (the non-constant shifter, load replays on misses, very narrow decoder when running out of trace cache).