You're starting to surprise me..
I think i missjudged you..

You do have a history of letting your ego cloud your judgment. :-)
Remember the bitcanuck R9 380 thread in the ethereum forums? You were convinced that reducing the core clock would reduce eth hashrates, but you were wrong.
I can't find the thread any more, as I think one of the mods deleted it. I could probably find it with the wayback machine if you've "forgotten" it. :-)
Come to think of it, you're a mod on the ethereum forums, aren't you...
It was in this thread, while I didn't realize it at the time, this remarkable counterintuiative result was published by (Helox?/Bitcanuk?/dihenky?) for the R9 380 which was an R9 380 stock at 800-820/1500 was hashing at 20+ MH/s. These spec's also result in the card's lowest power consumption @ 20+ MH/s.
The results in this R9 380 hot rodding thread are somewhat incomplete in that corresponding changes in power draw with mod's would also be of interest.