GPU Acceleration in Premiere Elements 2021 WORKS!!!!
FYI, if you have a GPU that is not currently supported in Premiere Elements 2021, you can sign up to be part of the beta testing to try to have your GPU added.
Three caveats: 1> you have to have an activated version of Premiere Elements 2021, it does not work with the trial version. 2> you may have to wait a week or more to get a reply back from the beta test application. 3> if you are accepted and sent the utility to add your GPU, you may need to run the utility more than once to get your GPU added into PRE-2021. First time I added my GPU, it went on the first run of the utility. I had to uninstall Premiere Elements afterwards for beta testing purposes, and when I ran the utility again to add my card, it did not go at first run, but a second run of the utility added the card into PRE-2021 and I was able to finish my beta testing.
I have an Nvidia GTX 1660 Ti and Premiere Elements 2021. I was recently accepted into beta testing, and can say that without a doubt, GPU acceleration works for my card now. A test export I completed without the GPU enabled took 22 minutes on my i9-9900K CPU with the Intel Graphics enabled. With the 1660 Ti enabled (thanks to the beta program), it only took 16 minutes to complete the same export project!!!
My test video was only 6 minutes long - but exported at maximum quality 4K 60FPS clip at 100Mbps bit rate - with a transition, and a couple of effects. Just imagine the potential export time savings for a 20+ minute vacation video collage with lots of transitions, titles, effects & edits....
Actually, I would add another caveat, if you have a high end video card (quite often overclocked by the manufacturer), I would run it at AMD's or nVidia's stock speed for that card for the purpose of initial beta testing to eleminate a potential source of problems/errors.
