Memory - HP MicroServer N40L Wiki
Memory The N40L comes with 1x2GB ECC RAM installed. It will accept up to 2×8GB (16GB total) (Gen8 will accept 32GB (2×16GB)) 240-Pin DDR3 SDRAM 1333 (PC3 10600) RAM [1]. Non-ECC RAM is compatible, but not recommended for mission critical ......