HP 713977-B21 | 4GB DDR3-1600MHz PC3-12800 ECC Unbuffered CL11 240-Pin DIMM 1.35V Low Voltage Dual Rank Memory Module

Technical Specs:
- Memory Size: 4GB
- Memory Technology: DDR3 SDRAM
- Memory Speed: 1600MHz
- Memory Standard: PC3-12800
- Error Checking: ECC
- Signal Processing: Unbuffered
- CAS Latency: CL11
- Number of Pins: 240-pin
- Form Factor: DIMM
- Memory Voltage: 1.35V
- Rank: Dual

Helpful notes:
- ECC (Error-Correcting Code) memory is more reliable than non-ECC memory, as it can detect and correct single-bit errors.
- The low voltage of 1.35V reduces power consumption and heat generation, making it a good choice for energy-efficient systems.
- Dual rank memory modules provide better performance than single rank modules, as they can access more memory banks simultaneously.