Hmmm..... it appears my motherboard only supports DDR3 1333/1066/800 MHz memory modules. I have 2 x 4GB XMS Memory kit for dual channel systems, 1600MHz, 9-9-9-24, 1.65V. This may be a stupid question, and sorry if it is, but does this mean no matter what I do these memory modules are not going to function at 4gb, each? I'm not sure of the consequences of running a 4gb 1600 module at 1333. The mb supports up to 16GB RAM.