Having previously ordered from another supplier 8GB Memory / RAM for my Acer Aspire 5741G and built in vain, I decided to spend 15 more and to buy the RAM shown here. The delivery came earlier than announced / expected, but slightly slower than with Amazon Prime. AC adapter, battery out and replace the existing original 4 GB with the new 8 GB: Installation battery and reboot and everything is fine. So it must be.