ok, after reading a lot of post in this forum i saw that the fastest cpu for tvbox was S922X or RK3399, which can advise me the best tvbox with eMMC memory (I will like to install the system on eMMC instead of android)
the goal being to find a tvbox that boots with armbian, a network card that works (I only connect to tvbox to the ethernet network, no screen, no sound, no BT or wifi or other, so the graphics are not important, just see in terminal mode) I want to install bionic or focal in server mode.
Thanks for your help