I have been aware of patched X11 GPU miners and decided to revisit the X11 algorithm calculations. The patched miner provided noticeable gains. However, since PHM has stopped sph-sgminer development, the folks over at NiceHash.com sponsored development of something that suites their needs. Their sgminer v5 makes huge improvements on X11 (probably others).
NEW GPU Advantage Calcs
AMD FX-8320 using Elmad’s CPU-Miner v(1.3) = 458kh/s
R9 280x (average from here) = 4.2mh/s
Advantage = 9.2