Summary: Just received this and installed it in my Acer computer with no trouble. So far the two 4 GB cards seem to be playing nicely with the two 2 GB cards for 12 GB total. The memory came in good packaging too. All together, I am pleased with it.
Summary: Bought on special for 31$ plus tax ends up pay 35$ for these ram perfect for amateur gaming. very stable at 1333mhz. Just make sure when you set up Dram led might flashing during setup just put 1 ram at a time and then all rams together the problem will be solved