Please refer to your motherboard system Memory QVL if you want to occupy four slots. Some systems might lower the memory maximum speed when you install four DIMMS to have full loading Please remember to activate the XMP setting in your BIOS in order to reach 3200MHz frequency. Otherwise, your system might run at 2400MHz default speed setting (Without XMP, RAM will run according to RAMs base frequency. To reach advertised speeds, must enable XMP) Intel XMP 2.0 (Extreme Memory Profile) Support DDR4 3200MHz PC4-25600 288 Pin Unbuffered Non-ECC 1.35V CL16 Timing 16-18-18-38-56 Single Rank 1Rx8 based 2048x8 Compatible with AMD 300 Series/ AMD 400 Series and later, AMD CPU Zen and Zen+( Ryzen 3/ Ryzen 5/ Ryzen 7/ Threadripper); Intel 100 Series/ Intel 200 Series/ Intel 300 Series and later, Intel X99/ Intel X299 and later, Intel CPU 6th gen and above(i3/ i5/ i7/ i9)