Not enough RAM Photoshop error

Edit the Registry entry

• Press Windows key + R to open the Run command line.
• In the command line, type Regedit and Press Enter.
• Navigate to Computer\HKEY_CURRENT_USER\Software\Adobe\Photoshop\90.0. The “90.0.” part means that the Photoshop version in this example is Photoshop CC 2015. The values change for different versions.

1. Right-click on the empty area of the right pane and choose New > DWORD (32-bit) Value.
2. Name the newly-created DWORD OverridePhysicalMemoryMB and assign its value to 2400. Make sure that Hexadecimal value is toggled and not Decimal.
3. Save changes, start Photoshop, and look for improvements.