lmao the readings are correct, I can show you a picture. how else would I be getting 455 Mhash/s if it was stock and how would my temperature still be 75 celcius? I have checked gpu-z before as well, but mainly to look at the other readings.
It's all thanks to msi afterburner, I can disable powerplay and clock ram as low as I want, as long as its 2.2.0 beta 10 or below. They messed something up with newer versions.
The Mhash/s isn't even that important I watch it for 5 minutes every now and then to make sure it's putting out at least 7 shares/min. It ranges from 5-14 depending on how the pool's LP is performing.
There are so many optimizations possible with the new sdk it sucks everyone is staying away from it, I'm testing a really nice one I found that might be able to give a 10% boost overall, but I haven't had anyone else test it yet so I don't know.