Intel's B390/G3 would have been a better choice. The Ryzen 395 is not intended for handheld devices, unless you want a $2000+ blow drier.
It appears that GPD Win Max 3 is highly ambitious because of all the RAM that it has along with the 165Hz AMOLED screen and 97Wh battery capacity. It is quite intriguing for me to know about the thermals and battery performance of the device while playing games. There is quite some relation of the result here with Kolkata Fatafat result and Kolkata ff lottery result. Though the figures appear highly impressive, it is only after seeing their performance that they gain value.