Yes, so far we can play all the emulator games. You can check the video that we took for emulator games.
I don't thing it is a good idea to compare both GPD G7 and GPD G5A with JXD S7800B. They have different designs. For me, I think GPD G7 and G5A are more like gaming console. 7800B is the combination for gaming console and tablets.
The resolution on G7 is much better than G5A. But the size of G5A is more comfortable for you to play games.
They do have their good points. You can select according to your demand.
The good news is that we will get these two items during this week. We will share you more final version pictures to you at that time.
Wish they can be your new year gifts!