4 x DDR4 DIMM sockets supporting up to 64 GB of system memory * Due to a Windows 32-bit operating system limitation, when more than 4 GB of physical memory is installed, the actual memory size displayed will be less than the size of the physical memory installed. Dual channel memory architecture Support for DDR4 2133 MHz memory modules Support for ECC UDIMM1Rx8/2Rx8memorymodules (operate in non-ECCmode) Support for non-ECC UDIMM 1Rx8/2Rx8/1Rx16 memory modules Support for Extreme Memory Profile (XMP) memory modules (Go to GIGABYTE's website for the latest supported memory speeds and memory
Did you update the BIOS? CMK32GX4M4B3000C15 this is @3000 not 2133 if running @ 3000 might need to turn up volts on the ram
Two sticks of 2x16 are better than four 2x8