Fujitsu 4GB DDR3 1600MHz ECC Unbuffered

A powerful and reliable DDR3 ECC Unbuffered server memory module. It is designed for powerful systems, servers, and multiprocessor computers. This module is primarily designed for the Fujitsu Primergy TX1310 M1, TX1320 M1, TX1330 M1, and RX1330 M1 servers to ensure full compatibility. It was tested for the most demanding use, making it ideal for critical applications and servers.
ECC technology performs real-time integrity checks of the data stored in memory. This allows it to find and fix single-bit errors and detect errors of two bits per 64-bit word. Some memory controllers can also repair larger errors in conjunction with ECC memory. Most professional motherboards require system memory with ECC support, as coupled with parity control, this solution provides maximum control over transferred data. Parity means that a bit added to a string of binary code (the so-called parity bit), which is then used as a simple form of error detecting code.
The memory module has a single memory block (memory rank) 72 bits wide (64 bit for data and extra 8 bits for ECC code). Most server chipsets have a limited memory rank or prescribed memory configuration for individual slots, so you need to keep this detail in mind when considering future upgrades—if you have a full memory rank on your motherboard, you will not be able to add another module even if you have some free memory slots left.
Memory modules with the "x8" chip structure are cheaper, but they don’t support advanced server technologies, such as multiple-bit error correction, Chipkill, memory scrubbing, or Intel Single Device DataCorrection (SDDC), making them ideal for entry-level servers.