Litecoin Reaper GPU config
First, don't even consider mining on nVidia GPUs. Secondly, if you're using nVidia GPU, why do you use AMD APP? You should be using nVidia CUDA instead. Next thing, Reaper is NOT mining on your GPU on the screen given, but on CPU instead - that's clearly stated in the screenshot you provided (using all devices - and only CPU is listed).

@Tom: you don't have to supply any command line options to mine with Reaper, all config can be easily done via .conf files.