2 bars received and installed in place of the original two 1GB modules (AData brand) You just go into the BIOS (F2 several times at start) and off Boot in the Boot tab booster function that prevents recognition of 4GB. Otherwise the 1201N still recognizes that 2GB. Once the function disabled, the 1201N recognizes without pb 4GB with 3.25 GB usable. Even if it does not really improve the startup of Window 7, it thins all applications then launched. And much less disk access. Then we can reactivate Boot Booster function. For the price, I am very satisfied. Why spend more?