There is no garuntee on 3rd party cards. I have no idea how they rate. Check some reviews-lots of'em and see if people are happy with that brand of radeon. That will generally tell ya cause they will comment on the ram speeds. It also helps to get a quote somewhere of the retailers spec of mem. Buy from a reputable co. and then if its not the spec they promised return it till they get it right. If they wont garuntee a spec buy elsewheres. Thats been my experience in all this.