PQI - TURBO series DDR2 1 GB PC2-5400 dual channel kit consists of two ultra-high-speed 512MB modules that are capable of achieving extreme 667MHz at latency 4-4-4-12. PQI utilizes advanced cutting edge technology in ICs sorting and select best quality ICs capable to run at the highest possible frequency. PQI25400-1GDB comes with elegant quality mirrored Black Copper heat spreader to enable efficient heat dissipation. All PQI - TURBO series DDR2 modules have been rigorously tested to perform superbly at its rated speed and come with lifetime warranty.