Vivobook X512DA316 - 16.6 GB of 20 GB RAM Hardware Reserved

_Michael_E_Michael_E Level 1
edited October 2021 in VivoBook
  1. System: Windows 10 Home 64 Bit
  2. Battery or AC: Both
  3. Model: Vivobook X512DA316
  4. Frequency of occurrence: Constant
  5. Reset OS: Yes
  6. Screenshot or video:


I have a new Vivobook X512DA316

It came with 4 GB onboard RAM and had one 4 GB DIMM in the expansion slot.

I replaced the 4 GB DIMM in the expansion slot with a 16 GB Crucial DDR4 - 3200 DIMM

Immediately after I replaced the memory the laptop booted up and showed 20 GB RAM installed and ~ 17.4 GB Available which was fine.

However, since that time, the laptop is now showing 20 GB installed but only 3.4 Available and the other 16.6 Hardware reserved.

I have updated the BIOS, I have made sure the Maximum Memory check box is not checked in msconfig.

MyAsus shows 20 GB installed in the system info.

Task Manager shows 3.4 GB Available

I really need more than 3.4 GB available to do the work I purchased this laptop for.

Please help!

Thank you,



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