Ok finally solved my Black Screen and reboot issues while gaming on my 5700XT and have a 100% solution to the problem.
I purchased a MSI 5700XT Gaming X graphic card in November 2019 after having many AMD/ATI cards in the past since 2009 and having not issues at all with previous AMD cards. The 5700XT card has been great however in August 2020 I noticed a Black Screen and reboot after playing the Rust game for about 16 hours. In the four months since the issue has gotten much worse from every two weeks, weekly, every three days, every day, 3 x times a day and now a Black Screen reboot 6 x times a day while playing Rust.
My Computer specs include;
I have tried a number of ways to fix the Black Screen and reboot issue while gaming including;
I feel the problem is that every 5700XT reference and partner cards are all clocked much too high from the factory (all overclocked). The only way to fix this and be 100% reliable is to setup the 5700XT to the same power and clock settings as the 5700 (non XT) card.
Using the Radeon software set the “Performance Tuning to manual and;
You can set the power and frequency higher however the card will probably not be 100% reliable. It will however be much better than with the reference or partner card default settings and will not Black Screen and reboot quite as much. The performance hit for the 5700XT is about -7% to -9% which is about the 2060 super or 2070 (non -super) levels however you will finnally have a completely stable AMD graphics card.