If it's Windows-based, you might want to try "CRU" to force a 50hz refresh rate. On the GPD Win 2, I just get a black screen, so the screen cannot handle a custom refresh rate.
I'm very happy with Retroarch on the Razer Phone 2. The 1440 x 2560 resolution may not seem perfect, but at that resolution, you don't seem to need integer scaling anymore.
I'm getting a GPD Win 3, which is expensive, but quite powerful.
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