AMD Fine Tuning Explained? (Help with Under/Overclocking)

Tech Support Guy System Info Utility version 1.0.0.9
OS Version: Microsoft Windows 10 Home, 64 bit, Build 19043, Installed 20201025150242.000000-300
Processor: AMD Ryzen 7 3700X 8-Core Processor, AMD64 Family 23 Model 113 Stepping 0, CPU Count: 16
Total Physical RAM: 16 GB
Graphics Card: AMD Radeon RX 5700 XT
Hard Drives: C: 460 GB (65 GB Free); D: 931 GB (931 GB Free);
Motherboard: Alienware 0NWN7M, ver A00, s/n 6TL5H63.CNPE10008401J6.
System: Alienware, ver ALWARE - 1072009, s/n 6TL5H63
Antivirus: Windows Defender, Enabled and Updated

I've been trying to run Diablo 2 on my PC, but have been having consistent crashes every single time I launch the game. Within 10 seconds of opening the application, the game crashes to desktop. Sometimes the monitors flicker and I get an AMD error message, but this doesn't happen every time. After troubleshooting with Dell, AMD, and Blizzard, and getting nowhere, I did some research and found some random threads online where they suggested adjusting some settings in AMD's software to fine your GPU and iron out some performance issues.

I changed one setting and was able to get the game to run with minimal issues, but was advised by AMD NOT to use this as a work around and to ONLY use factory settings (which apparenly are not capable of running the game). They gave me the spiel about overclocking ruining your card and voiding any possible warranties. Right now I just want to find out if what I changed is even overclocking, and what some of the fine tuning settings actually do to the GPU when they are adjusted.



The settings I adjusted are in the image above. These are the factory settings. I changed the value under Frequncy "P3" to 1500, and was able to run the game. What does this actually do to my GPU? Is this overclocking? Underclocking? Is there something wrong with my card if it can't run games using the factory settings?