memory compatibility

Memory compatibility issues often arise when mixing RAM sticks of different brands, sizes, speeds, or timings, leading to system instability such as blue screens of death (BSODs), boot loops, or freezes. Common errors include IRQL_NOT_LESS_OR_EQUAL and crashes during Windows startup. Users report problems when combining mismatched sticks, even from the same manufacturer, or when populating all motherboard slots with non-identical modules. Solutions include using matched pairs, testing single sticks, or limiting total capacity to a stable configuration. Windows 7 and earlier versions are particularly sensitive to such mismatches, though hardware compatibility should be verified with the motherboard's qualified vendor list.