Have a new Z87 PRO4 MB.
I installed G.Skill memory, 16GB (2x8GB) #F3-12800CL10D-16GBXL.
The BIOS is reporting that it is in dual channel mode, but that it has only 4GB (2x2GB) installed.
"2048 667MHZ (DDR3-1333) 9-9-9-24"(twice)
I know that F3-12800CL10D-16GBXL is not on the compatibility list...