High-Quality and Strict Test: All chips are from big brand manufacturers a high level of reliability. All chips 100% Tested. It can provide your computer with superior memory quality and the stability required for long term system operation. Plug and Play: Memory upgrade is one of the fastest, easiest, and most affordable ways to immediately improve the performance of your computer. It can improve your computer system performance, reduce power consumption and extend battery life. Faster burst access speed for improved sequential data throughput, bring you great online and game experience. Attention: Before purchase, please ensure your computer ram model, max ram and ram slot. Before installation, please wipe connection finger gently with eraser. Superior Compatibility: DDR2 667MHz PC2 5300U 4GB Kit (2GBx2) UDIMM 240-Pin Non-ECC Unbuffered 2Rx8 Dual Rank Desktop Memory, With strong compatibility and high stability with motherboards of various brands