Yeah I would save up another $40 or the $80 will be somewhat squandered on crappy hardware imo. Ive seen plenty of used 7870s for example for $100 or less. One jsut sold recently in the Toms deals section. If your budget is truly $80 and you can't nickel up then id go for a used GPU. You could probably find a gtx 560ti or something similar for 80 or less.