Vaseky Whiskey 4G-DDR4-2666 notebook memory module fully compatible

OverviewOperating system and available memory description The available memory of win xp system is about 3G, the available memory of win7win8 32-bit system is between 2.1-3.5G, and the available memory of win7 win8 64-bit system is basically all available, please choose the appropriate operating system and memory. Note: The above available memory is the total computer memory. Memory of the same generation is backward compatible in frequency. For example, DDR3 frequencies include 1333, 1600, 1866, etc., 1866 can be used on a motherboard that supports 1600 or 1333, but it will be used at a reduced frequency;