Why does Photoshop only see 50% of Win10 x64 8Gb memory?

Question

Adobe Photoshop

Why does Photoshop 64bit only see 50% of Win10 x64 8Gb memory? I don't know what to do anymore.
I tried different versions, the result is one, you can see only what is in the screenshot. Photoshop on this version already worked for me for a couple of years before the Windows 10 update - 1803 Everything was ok, I saw all the available memory.
Maybe something has changed in working with applications in Windows 10 - 1803?
Did not help:
Installing different versions of Photoshop 64 bit versions.
Running as administrator
does not help Running in compatibility mode (any) does not help, including automatically.
A clean installation of Windows 10 did not help - 1803 x63 - downloaded from the site (the license is not pirated)
A clean installation of Photoshop CC of any version does not help, all versions see the same only what is on the screen
Does not help to rearrange the strips

Answer 1

Found a working solution
In short - open regedit from the admin
, follow this path

Компьютер\HKEY_CURRENT_USER\Software\Adobe\Photoshop\120.0

create a new parameter. DWORD
Name it OverridePhysicalMemoryMB
In the parameter, switch to 10th values ​​and enter the rounded value of our RAM in mb.
(I have it 8000)
Restart the flash, everything should work.
PS: Many users have similar problems after updating windows creators update (whatever it is)
PS2:
I'm not sure if the solution works, and not just creates a props in the form of numbers. But the RAM becomes available like everything.
I found the solution here https://helpx.adobe.com/photoshop/kb/invalid-numer...
Thanks to the English language, on Russian resources it is as usual.

Answer 2

Faced such problem today. I did everything according to the instructions above. Didn't help. in Photoshop it was written that all 8 GB were involved, but the braking continued. I decided to remove Photoshop and install another one. Launched the uninstaller IObit Uninstaller 9.... And then the error opened. He wrote to me: which version do you want to remove 32 or 64? Of course I chose 32 .... And everything worked like a bullet !!! Although the IObit Uninstaller 9 program now does not see the remaining version of Photoshop in itself) Maybe my experience will come in handy for someone.