Asteroid uses crowd-sourced data from users like you to find the best settings for scrypt (Litecoin) on its internal cgminer and sgminer mining engines. These settings are specific to each graphics card, and can often involve a lot of time to tweak. Asteroid will automatically check this database, and if it finds settings that would get you better speeds for your GPU, it will let you know! This list should work for anyone else running cgminer and similar hardware, PC or Mac.
If you wish to contribute to this database, be sure to check "Upload my settings for the benefit of other Asteroid users" in the Scrypt preferences of Asteroid. This page is generated from 27623 voluntary submissions from Asteroid users. Hashrates are maximums per card/memory combo. "People" are counted as unique IP addresses.