When buying, you can ask the memory to be ECC or EPP verification function memory, which can be set and seen in the bios of the motherboard. ECC or EPP verification of memory is for the purpose of reading hit rate of data from memory to CPU, thus improving data submission ability and processing ability. However, the memory disadvantage of this function is that if it doesn't hit, it will resend instructions and need data retransmission, which will affect the processing speed and the price is relatively high.