I removed and reinstalled Poem in a Win7, x64, AMD A8-3870k, XFX 6870 system with app_config set to 1 CPU for every 0.5 GPU. 1 WU ran for 18,000 seconds, completed and validated. 31,200 credits a day compared to over 250,000 a day on the retired project. (The computer was running other CPU projects plus being used for Internet surfing and youtube watching).

FYI, the 6870 is a single precision card and the 7790 is double precision.