The one looks like the 2133mhz, the new is 1333mhz, you can go to the BIOS set to 1333mhz 9-9-9-27 ( check your MB manual ). And you do have the 8GB (2X4GB) 2133Mhz you will be more than enough for most usage, it is not a good idea to buy other single 1333mhz RAM.