I just came from a retail store to check on prices but most of their parts weren't available anymore. Instead of a G. Skill Ripjaws 2x4 8gb DDR-3 1600, the clerk offered me a Crucial Ballistix 2x4 8gb DDR-3 1866 memory. The board I'm gonna buy is an Asrock H77 Pro4/Mvp but looking at their memory support list http://www.asrock.com/mb/memory.asp?Model=H77 Pro4/MVP, it doesn't seem compatible. The clerk had told me it was compatible and that he had tried it before but I'm not sure if it'd have unwanted effects over some period of time. (I got drawn in by how the memory looks and its LED so I'm including it as a choice). Thanks.