Stuff like this seems in the same performance range https://www.seeedstudio.com/MediaTek-X20-Development-Board-p-2702.html https://www.seeedstudio.com/MediaTek-

Stuff like this seems in the same performance range https://www.seeedstudio.com/MediaTek-X20-Development-Board-p-2702.html https://www.seeedstudio.com/MediaTek-X20-Development-Board-p... Even tough it doesn't have OpenCL 2 capable GPU it has 10 cores - but something on the higher end seems very expensive and cheap boards are generation old chips with Mali450 GPUs or PI level HW. It seems cheaper to get a cheap chinese phone with top level chipset and all the sensors and dissasemble it - maybe get one with a broken screen - although it's a gamble that the rest works.