This motherboard has been tested with different memory part numbers with memory up to 16GB. There is a special configuration your memory must meet. Please check this link:
Hello Kevin, thank you very much for your answer.
I think that memory are full compatible. As I mentioned in my post, BIOS recognize all the 16 GB of RAM, if init with CENTOS 7 Live CD works perfectlly with 16 GB, even forcing a full read of memory RAM.
Only fails with Windows 7 x64 Professional.
This is why i can't understand what is happened.
I have been searching for bugs in Windows 7 but nothing founded relative to this issue.