Please know before you buy1 x 4GB means there are 1 pieces of ram, each ram is 4GB, total 4GB2 x 4GB means there are 2 pieces of ram, each ram is 4GB, total 8GB2 x 8GB means there are 2 pieces of ram, each ram is 8GB, total 16GBL 4GB 8GBModel: LCapacity:4GB/8GBL 1066MHZ=8500S CL7L 1333MHZ=10600S CL9L 1600MHZ=12800S CL11Memory Speed:1600MHzset Brand:Micron Chatency:1600MHz=CL11Pins:=204pinVoltage:=1.35VFeatures:UneredFunction:Non-ECCRamBrand:crucialWarranty:lifetime warranty BrandMicron, Hynix, SamsungMicron Adopt high-quality IC particles and pa strict testing to ensure high stability and bility, which is a powerful tool to improve efficiency and easily achieve work objectivesWhy is my program (CPU-Z etc.) showing that my memory is running at half the frequency?CPU-Z usually detects the bus frequency of the memory, which is half of the frequency for type memory. (Double Data Rate) data rate provides twice the memory bus frequency. Therefore, if the memory bus speed is 800MHz and you are using -1600 memory, the RAM is running at the correct speed.Black Diamond s Quality AuranceDesigned with 8 layers of black diamond board, new frosted black anti-solder layer, with anti-interference, anti-static performance, gold fingers using high-strength gold plating proce, wear resistance, anti-oxidation is stronger, and has a better electrical conductivity, to ensure the stability of data nsmiionHigh speed and stability Excellent compatibilityHigh quality memory selection and advanced technology to ensure compatibility with mainstream brand computers, support various operating syst and ensure long and stable system operationTechnically sound and powerfulProfeional memory technology and comprehensive memory solutions, offering targeted memory timing settings and a wider range of CL programmability to meet individuaamer needsQuick response game, easy to deal with in the officeEasily upgrade your computer to support large games runs,Stable improvement of computer operating efficiencyHigher frequency Significant speed sHigh frequency speed memory nsfer and CPU data exchange more quickly, and good support for operating system multi-threaded operation, multi-tasking operations, large games run smoothly, bringing zero latency and fast experience1. brand with box2. Factory full d with stable quality3. In stock for fast delivery e sure4.(with the number)Due to memory compatibility iues, please ensure that the memory can work on the before purchasing this memory. If you do not understand the product, please consult customer service before buying, thank you!