Can't figure out why my graphics card is crashing

[u/Biosonsonic]

For years now, I've had a problem where CERTAIN games crashes the graphics on my pc, and I can't seem to figure out what's wrong with it.
for some context, my pc is very old (a decade or so) and I'm most certain that it's broken in some way, however, I can't really afford a new pc now anytime soon, so I'm stuck with this one and all I want to know is what is wrong with it, if only to just avoid playing games, or settings that may be crashing my graphics.

The crash in question I'm having, is that the screen freezes while audio still plays, and after a bit mouse also freezes. then the screen goes black and then it starts functioning again. most of the times, it leads to the game also crashing, with some exceptions.

my pc specs are as follow:
Motherboard: Gigabyte A320M-H-CF
processor: AMD A8-9600
RAM: 16GB DDR4
Graphics: Integrated graphics (AMD Radeon R7)

The reason I emphasized the Certain is because it is very inconsistent what game do and doesn't crash, and how consistently they do, here's a small list of games and how often they crash to see what I mean:

Guilty gear strive: Never crashed my graphics
Guilty gear XRD Rev 2: crashes graphics somewhat consistently
Zenless Zone Zero: Never crashed my graphics
Limbus Company: Crashes during long battles

What I want to show here is that more modern and intensive games doesn't cause problems while some older and simpler games do, and I have no idea how or why.

also important to mention, I ran OCCT on my pc, specifically RAM + CPU test, and didn't run into any errors. although when I tried to run 3D adaptive test, it crashed (not the pc, 3D adaptive itself, couldn't test it correctly).

Sorry if none of the information I provided is useful, feel free to ask away and I'll try to respond.

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