I been mining on 2 rigs for 2 months using:
windows 7 ulti.
h81 bro btc + Ram 8 GB + Intel Pentium Processor G3240
every rig have 5 cards of Sapphire nitro+ 480 8G 11260-01-20G set at 1342/2200 hashing 27.4-27.5
I saw people saying that it can be raises to 28-29 (without any mod or bios flash) only using overclock
I would like to say the rigs are stable and working good with 16.11.5 (pow lim 0 & mv -24)
The cards have samsung rams with asics (75-85) but all same hash 27.4-27.5
any help to raise would be appreciated even 0.5 for 10 cards it will be 5 Mh/s

My batch is:
setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
EthDcrMiner64.exe -epool eu1.ethermine.org:4444 -ewal mywallet.Rig2 -epsw x -ethi 16 -esm 2 -mode 1 -tstop 80,75,75,75,75 -allcoins 1
pause