161 mhash/s on my 5770, the memory is underclocked. Ive tried O/C but haven't found a suitable set of settings that doesn't lock my card up.
What temps you getting stock with no OC? Use MSI Afterburner to get that info.
If she's running hot, grab some AS5 paste from newegg and alcohol from walmart and redo the paste on 5770 it helps ALOT on these...imho shitty lowend cards.
Here is my diamond before I cleaned and AS5'd it, litterally droped 15c during load. Which you can see why the pic is paste job diamond did.
Flags(guiminer): VECTORS BFI_INT FASTLOOP=false AGGRESSION=12 -k phatk WORKSIZE=128
Pulls about 205-210mhash/s for me