another old desktop question

[beginnercomputermaker2016]

my grandma's desktop (dell studio XPS 435 MT) has a graphics card problem that ive been trying to fix for years. the problem is the fact that when i play a game like cities:skylines or euro truck simulator 2 on directx it comes up with triangle shaped holes in the graphics of the game. the main reason why its doing this was due to a experiment i did back when i was still learning how to use a computer. the experiment was to overclock the graphics card and that experiment failed due to the previously mentioned problem ive been trying to fix for years.... i am pretty much stumped because i even asked a computer repairman to see if there was physical damage to the graphics card and even he didn't see any of the sort.... i really need advice and serious help.

 

[USAFRet]

"the experiment was to overclock the graphics card"

Have you given thought to the concept that you cannot OC that GPU?
Or do much else with that system?

Maybe it is time for you to buy/build your own system to run your games.

 

[beginnercomputermaker2016]

"the experiment was to overclock the graphics card"

Have you given thought to the concept that you cannot OC that GPU?
Or do much else with that system?

Maybe it is time for you to buy/build your own system to run your games.

this was a few years ago tho and i learned my lesson since then....
i even had the overclocking software uninstalled just after the experiment failed. i was young (around 14-15 yo) and was just constantly curious then. now i know better but i am still curious, i know enough on the software parts i just am learning about the hardware parts now and teaching myself and asking questions on a lot of things on hardware for computers. even tho i am still learning stuff on some software programs like live streaming and other programs/apps.