wrong memory capacity/size showing 4....16 installed

[gstadter]

Have a new Z87 PRO4. I think the bios vers is 1.70, unless I am looking in the wrong place.
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"
I know that F3-12800CL10D-16GBXL is not on the compatibility list, but F3-12800CL10Q-32GBXL is.
My understanding is that the two are of the same spec with the single exception that the latter is 4x8 instead of 2x8.
Do I really need to pull out the F3-12800CL10D-16GBXL and replace it with something else?
Or is there some other setting or configuration I should try to get it to see all 16GB?
I have tried putting the memory in slots 0 & 2, as well as in 1 & 3.
ANY thoughts, ideas, or suggestions would be greatly appreciated.
-Gary

[supahos]

My first suggestion is to check and see if there is a newer update to the bios, not sure either way on this. Next try just using a single stick and see if you can get it to recognize it as 8gb, enable xmp, start windows, shut it down, and add the second stick. If it still recognizes the stick as 2gb, try the other stick and see if possibly one of them is bad.

[GSKILL TECH]

Use a program called CPU-Z to check what the Model number of the RAM is in the SPD tab. If you can, post a picture of the SPD page and we can see what's going on.

Thank you
GSKILL TECH