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Windows 11 can run on 1GB of ram without constant paging. Also, right now its uses 572 MB of memory while im writing this! : r/Windows11
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Windows 10 Help Forums
Why My 64 bit Windows 7 Still Show 3GB Usable Out of 4GB - NEXTOFWINDOWS.COM
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How Can I Reduce High Memory Usage in Windows 7 : 15 Steps - Instructables
Windows 7 Maximum Supported RAM - 192 GB RAM
How to upgrade to Windows 10 from Windows 7 - Pureinfotech
16 GB RAM, Windows 7 Pro 64-bit, hardware reserved - mxnet