一定要低电压的条 The Precision M4800 & M6800 systems utilize the Intel 4th Generation processors that require memory SoDIMMs known as DDR3-Low Voltage or "DDR3L". Systems utilizing this generation of processors are not backward compatible with regular DDR3 memory modules (Figure 1). If a DDR3 SoDIMM memory module is inserted into the system, the system will not complete Power On Self Test (POST). https://www.dell.com/support/article/sr/en/srbsdt1/sln291056/how-to- determine-memory-upgrades-for-your-dell-precision-mobile-m4800-m6800- portable-computer?lang=en