www.nogleg.com/archive/barelyclocked.rar
unrar it somewhere, type barelyclocked
if there's one gpu, it'll be gpu 0
so then
barelyclocked gpu=0 memory=160
barelyclocked gpu=0 core=1000
barelyclocked gpu=0 vddc=1.163 (not necessary in this case, since it defaults to performance level 3)
then cgminer should run at 128 worksize, 2 vectors, and you should get ~320-325mhash
most cards can run at 900-930/160 @ 1.063v & 730-790/130 @ 0.95v, which is better depending on the cost of your electricity. the 1.063v option is better in almost all cases
manually edit cgminer.conf file so that your fan speed doesnt max out at 85%