I ordered the M5P with CB1 with eMMc memory and I was very pleased. Then I ordered the Manta M8P version 2 and installed a Pi CM4 with eMMc. The M8P is so much faster and I ordered three more TMC2209 motor drives. They stay cooler and have the capacity to extend the lives of the motor drives they control. Big Tree Tech allows me to upgrade my printer well beyond what Creality even envisioned when they made my very capable CR10S Pro V2 which was pretty well engineered with a 8 bit boad.