I had originally ordered 3 of the Jdata DDR3 1333 ram (which actually cost much more)her on Overstoack. Installed them and I had one module bad right off the bat. Returned it and when I installed the replacement, one of the other modules failed. The computer hadn't even been turn on while waiting for replacement. I decided to reutrn all 3 for a refund. I ordered these to replace them. They're working fine and will be ordering 2 more sets of these. I should've ordered these to begin with. Not only is the quality better, but they cost about 1/2 as much as the bad ram did.