The difference is the amount of running memory.
The difference between 8g and 12g of the Snapdragon 8 gen1 is that the two run different memory capacities. The release of a mobile phone is to face different people, under the premise of the same type of chip, 12g running memory for multitasking system response is of course better than 8g, but for some mobile phone use is not high user groups, 8g enough to use, there is no need to spend hundreds of pieces to buy 12g running memory models.