That should not happen, but computer's can be configured in a of ways. For example, I run Photoshop and all kinds of games in tandem. Red Dead Redemption, Assassins Creed etc and with similar RAM but I use an nVidia card. The question then becomes are there any settings outside of these games and Photoshop that are used to“optimize” the computer? GPU settings, Steam settings anything like that?
Let's start with Photoshop > select Help > System Info.
In the System Info dialog, click Copy.
Attach or copy the info here to this thread.
... View more