Thanks to our reader "Martin" who contacted us and shared the fact that Microsoft has released a new update for Windows 8 operating system which allows automatic upgrade to Windows 8.1.
Once this update is installed, the Windows 8 computer is automatically updated to Windows 8.1 OS.
Also, these instructions should work for a Dell Latitude D820 and maybe some other models. In order to remove the existing memory module carefully spread latches on both sides of the slot. In this notebook RAM can run in dual-channel mode which doubles the amount of available bandwidth and improves the laptop performance.
If it works for you, please mention the model in the comments. You should use PC2-5300 SODIMM which runs at 667MHz. In order to run dual-channel mode you must have two identical memory modules in slots A and B.
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