UIS8581 Processor

The Unisoc UIS8581E processor is found in some Android headunits; its most significant market share is in mobile phones.

UIS8581 Questions and Answers

Cores

The UIS8581 has 8 cores, and this makes it an octa-core processor.
The 8 ARM Cortex A55 cores are arranged as 2 sets of 4.

4 of the ARM cores run at a max 1.2GHz
while the other
4 of the ARM cores run at a max 1.6GHz

This 4+4 ARM Cortex is designed for a low-power 4 to save battery and a high-power 4 to provide a fast response. This is ideal for a phone but not needed or wanted in an Android headunit. The UIS8581E is another processor that has found its way from the phones into a less-than-ideal Android headunit platform.

ARMv8.2A

The ARM Cortex-A55 implements the ARMv8.2-A (64-bit) instruction set architecture. This relatively modern system has 64 bits playing advantage over the earlier 32-bit instruction sets in the older Android headunits by being 64-bit ready for the new Apps starting to appear.

Being ARMv8.2-A (64-bit) based makes the UIS8581E a modern processor.

RAM

The quantity of RAM fitted to the UIS8581E-based Android headunits varied between 2 GB and 4 GB.

Modern Android headunits are fitted with a minimum of 4 GB, and the 2 GB and 3 GB options look like a cost-cutting operation that went too far. When the chip can support 4 GB RAM, anything less is a massive loss for the sake of a few yen.

Similarities

The UIS8581E 8-core processor shares a striking resemblance to the UNISOC SC9863. The two processors share the same ARM Cortex-A55 cores, clocked at 1.2 GHz/1.6 GHz. The UIS8581E and the UNISOC SC9863 can be treated as the same processor when comparing Android headunits. The performance will be the same when both have their maximum 4 GB RAM.