I fold on all my cards that are supported. Currently, 5770, r7 370, 7870, and 1070.
They all do okay. 1070 smashes in 6 hours what the 5770 and 370 and 7870 combined do in a day darn near though.
Dunno if I should start mining, I already have a grand's worth of hardware according to ebay's super bloated prices