Short story, it is only recently that Windows allowed WOW TBC Classic Gold multiple monitor refresh rates to be used In the past 13 years, Microsoft seems to have tackled a long-forgotten problem regarding how Windows handles multi-monitor resizable rates. Windows 10's Desktop Window Manager, (DWM) was a cause of frame-skips as well as staggers when multiple monitors had differing refresh rates. This issue is fixed by Windows 10's DWM 20H1, which has the ability to support hardware-accelerated GPU scheduling (WDDM 2.7). A Reddit user has shown this effect.

This problem caused me to switch between a 144hz main screen and a 60hz secondary display to one monitor with 144hz. This was due to the fact that I did not wish to change my system, and my 60hz monitor was due for an upgrade.

However, I did so by upgrading to a larger main screen. This meant that my GPU was now driving more pixels with a higher speed. My GPU, which seemed to work fine previously for an application as simple as Classic WoW but was now having to put in the work. It was simply not enough for the job.

Even with all addons deactivated, I noticed that the game could flicker regardless of whether VSync was turned off or switched on. It happened regardless of the fact that my GPU was over its limits. With all the lush vegetation and zones such as Nagrand the GPU of my computer would be forced to the limit before eventually resulting in being throttled.

And it appears that the WoW engine really does not like when the GPU is able to throttle for my configuration. My CPU was not running at a brisk pace, but with my GPU running at its limits, I could see the flickering. The flickering became more noticeable due to extensions.

This is why I had to limit my in-game FPS limit to 60 , and everything became more stable. Although it's annoying when you're able see your back at 60 after a few minutes of playing but it's far better than the flickering that I experienced.

So after changing my settings, and limiting my framerate down to 60, I still was seeing a fair amount of flickering. This is what I previously mentioned in my blog post. Although I was sure it was the fault of my GPU, a part of me believed it could be the culprit. My GPU will not be able to handle other games. It's the right time to buy WOW TBC Gold upgrade my GPU. I'll need another. (I wanted to upgrade my GPU, but ...) I'm convinced the GPU is fine. There aren't any issues with the hardware.