For each brand there Faulty goods! I have the memory now installed already 6 times 5x 2x4 dual channel and 1x 4x4 Quatchannel! The Sys with Quatchannel + i7 3930K @ 4,6Ghz and one with dual channel i5 3570K @ 4,6Ghz are my own PC's and the others I have installed my friends. The PC with the i5 of mine in mom over 12,662 hours (1 year has 8760 hours, just for info) completes without any errors in continuous operation !!! I would say that is not bad ... I can just recommend the store !!!