I think that chart above is wrong. Cause I was able to get 756 on core with 1512 on shaders... you were too.

Bumping my voltage up to about 1.30v on my gpu, let me overclock it to 783/1566. But my problem is vrm temps start to get up there, and that bothers me.

Either my cooling is a one off, or the dtek unsinks arent that good for cooling vrm's. Looking at the temps you got in everest, I wish i got a full cover block for my 280.