SRBminer is windows only. I do not plan to start using windows for mining.
PP: At the end , efficiency is the ultimate goal. Chasing higher hashrate sometimes leads to lowering efficiency.
Laik2, please send me PM, i would like to send you some text, but disabled.
Thank you
And why would I do that?

P.P. to the point... as VirosaGITS said G5 is already pretty optimized, I was able to gain additional 0.5MH from samsung on p106, but for micron it was pushed further, from 22.5 to 24.7, though with some memory errors.
What OhGodACompany is doing is by all means fast profit due to upcoming GPU obsoletion. I asked OhGodAGirl several times on IRC but got no response, so I'll ask here - Why now?