My screenshot above showing windows build and dx9 vram tool results. I now have 4x as much vram available!
Link below will get you informed and started on how to make the same for everyone using windows 10.
PC Classic - DiscussionDX9 4GB memory issue should be fixed in new Windows 10 Insider flight ()
submitted19 days ago by MSFTJesse
Hi all, a new build has been released to the Windows Insider fast ring, which contains my fix for the DX9 4GB memory issue. Link to the blog post (this change was not called out in the fixes list).
For those of you not familiar with the Insider program, you can go to https://insider.windows.com/ to sign up. Note that you will get some features that are not done, and are more likely to have bugs in your operating system if you choose to go this route. If you prefer, you can wait until the Fall Creator's update to get this fix.
Let me know if this works for you. Enjoy!