why am i only getting 350 at similar clocks? also why has my share generation turned into constant long polling errors?
There is a noticeable difference in hashing speeds between 319 MHz and 300 MHz. What miner are you using? What options? How about running Phoenix with phatk kernel that is specifically optimised for 5870 and SDK 2.4? My options are:
VECTORS BFI_INT FASTLOOP=false AGGRESSION=13 WORKSIZE=256WORKSIZE=128 gives a little lower result with SDK 2.4. With SDK 2.1 worksize of 128 gives better hashing speed but still lower than worksize of 256 with SDK 2.4. Beware, that's not a general rule but specific to the phatk kernel!