Do you have a dual GPU systems that feature an Intel iGPU? Is your dual GPU setup not working as expected? Before doing anything rash, please check the following:
There is a lot of confusion around this issue, fortunately, Tech TV USA has this informative video explaining more about Quick Sync, its settings for enabling and disabling Hardware Acceleration for Import and Export processes, and about the tech, in general. It's worth your time:
Info regarding Video Drivers for the Intel iGPU
For more info on this topic, see:
Adobe Help Documentation: GPU Accelerated Rendering & Hardware Encoding.
Adobe Community article: FAQ: Everything you need to know about GPU use in Premiere Pro.
For those editing HEVC or H.264 video files on Windows based machines with NVIDIA graphics, there is also another option to accelerate decoding other than Intel's iGPU / Quicksync decoding.
The free Turbocut Daniel2 plugin (available Adobe Exchange or directly at https://www.turbocut.com/ also adds NVIDIA accelerated HEVC and H.264 decoding capabilties next to various other features like worlds fastest video codec -> Daniel2, which is great for preview caching and ultrafast UHD, 8K (or higher res) editing.
But if you want the fastest way to hardware decode HEVC and H.264 using Nvidia GPUs, then Turbocut is your ticket right now. Give it a try. It's free.
It's worth noting that too new of drivers seem to also cause issues. It would be great to know when Adobe plans on addressing this because while I could roll back to support Premiere and After Effects I would be condemning other important software I use.
See this thread for details... important bit is right at the bottom.
I give props to Adobe for making use of Intel's Quick Sync and they should continue supporting it. Having said that there are other options.
I found interesting issue related to QuickSync decoding with Intel Graphics in while Premier playback/rendering and stucking with it more than one week by now: https://community.adobe.com/t5/premiere-pro/memory-growth-with-intel-hevc-decoder-acceleration-both-...
There seems to be something non-trivial. Would be fine if someone from Adobe could help with it or give some tools to track leaks, please...