Re: ✿~~♕[ANN][BAT]BatCoin -Gotham's Official Currency[EXCHANGED]♕~~✿
Try set thread-concurrency 8192, intensity 13, g 2 and underclock gpu engine... let say 1040-1060. I dont know if it gonna help. I got R9 280x so I think that it is really close to 7950. This is my best config, I have 730kh/s per one R9 280x. In my case it was VERY important to underclock gpu-engine. Default for my card was 1100 and on this i got 550kh/s. After propper undeclocking gpu-engine I have my config 
John,Post your BAT address, I wanna send you some guano sized thanks for this. I've been running my R9 280x with the exact same settings as you and was never able to break 550kH. That is, with one key difference... I never tried underclocking the gpu. You are right, on the R9 280x, that is KEY. My hash rate jumped instantly. Anyway, post or PM me your address and I'll send some bat poop your way. Seems like a weird way of saying thanks, but whatever.
As for the 7950, I think they average around 600-650kH without any major tweaking, with the ability to hit over 700kH if the sweet spot is found. With mine... Intensity, Thread Concurrency, and Mem clock made big differences as well as the mem clock to gpu clock ratio (sweet spot seemed to be about a 55-60% ratio, gpu to mem clock).