You dont need the memory set above default, i run mine lower. Depending on the miner you are using you could up the I - a bit. I wouldn't expect over 1GH tho, my 280's do 1.25
Memclock does not need to be upped for extra speed?? So I can basically remove the --gpu-memclock setting from my .bat? I am using cgminer-3.7.2-decred..... it was the first miner I found. I literally hooked up the gpu this afternoon EST lol. So haven't had much time to mess with settings, and as I say, I'm new to the next-gen algo's. So please forgive my ignorance on the matter.