I found the opencl files in AMD folder inside \Packages\Drivers\Display\WB6A_INF\B171094 (after decompressing the 14.6 driver package without installing it, or with 7zip)
I don't know which are needed, so I copied everything that had "opencl" or "amdocl" in the filename into the sgminer folder (8 files, dlls & exes).
Deleted all previous bins, and now it's even better (+3%) than using the bins from 14.6 (I have 14.4 drivers installed).
Did this... 14.4 drivers with 14.6 opencl files in sgminer folder. Msi 7790s up from 1.17mh to 1.62mh. Sapphire 270s up from 2mh to 2.72mh. If anyone is interested in my configs I'll post them upon request.
I use a 7790 (seven-seven-nine-zero, a bit weak I know, but only ~70W).
With 14.6 it went from 1.2MH/s to 1.8MH/s but with locked memory clock (core clock not locked).
I removed 14.6, kept the .bin files, reinstalled 14.4 and everything is fine.
If I recreate the .bin with 14.4 I get my old low hashrates again...
Yes these little things are great power savers, and they run so cool...wish I had bought more last December when they were .1btc each. I'm very curious to know whats in your 1.8mh config...