This is a image I stole from the internet. But this is how the Mac Pro checks its memory. With ECC and register. Meaning the operating system checks if the memory is working and when a proces sent to memory has not returned *meaning a bad memory chip* . This is what every workstation should have. But doesn't.

Error correction code memory (ECC memory) is a type of computer data storage that uses an error correction code (ECC) to detect and correct n-bit data corruption which occurs in memory.

Registered memory (also called buffered memory) is computer memory that has a register between the DRAM modules and the system's memory controller.