I have the criteria in advance exactly informed to meet the memory banks for my laptop (Sony Vaio). This Ram Kit I have made the right choice. I have the desired goods at a reasonable price, get in a short time and in perfect condition. And then it went quickly. Unscrew top - old memory banks out (2 banks x 2 GB) - new pure - top screw it - anschmeißen slide. My conclusion: Like it again.