1. Strict testing: In order to avoid disputes between the two parties, check the specifications of the device before purchasing. For example, computer motherboard model/RAM model/RAM slot/RAM frequency/maximum compatible memory capacity. 2. Standard voltage range: 1.425V~1.575V voltage range can work normally, effectively preventing voltage fluctuation/computer power supply aging, affecting RAM service life and work efficiency. Timings: CL-11. 3. Memory architecture: Adopt high-performance memory particles 512MB * 16 architecture mode, increase heat dissipation, more friendly to old motherboard / CPU. 4. Stability: High-performance memory granule Double rank memory distribution, combined with a unique thermal design, wide range voltage, Keeping the best at all times. Security: The appearance of an aluminum alloy heat-drawn net helps to dissipate heat and prevent static electricity. 5. 1600MHz RAM can downclock to 1333MHz or 1066MHz if your computer system specification only supports 1333MHz or 1066MHz. 6. Please contact our service staff if you have any questions, we will sort it out within 24 hours. Thanks for choosing us. Wish a happy shopping experience.