The s905l3 and s905l3a-b are both chips from Amlogic, but they have some differences. The s905l3a-b has a higher frequency and better performance than the s905l3, while also supporting more peripheral interfaces and higher decoding performance. However, the power consumption of the s905l3a-b is also correspondingly higher, so it is necessary to pay attention to control during use. Therefore, when choosing a chip, you need to choose according to the specific needs, if you need higher performance and more peripheral support, then s905l3a-b is a better choice, otherwise s905l3 can also meet most of the needs.