The MK810, an Android mini PC based on the new next generation Allwinner A31 quad core is currently being sold by vendors on AliExpress. The Allwinner A31 consists of a quad core ARM Cortex-A7 CPU and a Power VR SGX544MP2 GPU.
The other specifications of the MK810 include 2GB DDR3 RAM and 16 GB storage ROM. It also has 1 standard USB host port and 2 micro USB ports out of which one of the micro USB ports is for powering the device. For external storage, it includes a microSD memory expansion slot that supports up to 32 GB of additional storage. The Power VR GPU is capable of decoding UHD (4K) content at 30 FPS.
The Cortex-A7 was introduced in 2011 and has a few improvements over the older Cortex-A9 design. The popular Rockchip RK3066 SoC is a Cortex-A9 design. Compared to the Cortex-A9, the Cortex-A7 has lower power requirements and improved memory system performance.
Low power requirement is not an issue on a non battery operated device like the MK810 but lower power requirement also means less heat. Since over heating is an issue on some of the earlier Android mini PC devices, a low heat design is certainly welcome.
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Compared to the Rockchip RK3188, another quad core SoC that is expected to be widely used on the next generation of Android mini PC devices, the Allwinner A31 has a lower clock speed (1.0 GHz vs 1.8 Ghz). The Power VR GPU on the A31 also has a slightly lower clock speed (355 MHz vs 533 MHz) compared to the Mali400 GPU on the RK3188. On the other hand, the RK3188 is based on the older Cortex-A9.
Since devices based on both the A31 and the RK3188 will be hitting the shelves soon, it would be interesting to find out the real world performances of Android mini PC devices based on both these SoCs. However, benchmarks on the Kimdecent CS868, a device that is identical to the MK810, place the MK810 lower than devices with NVIDIA Tegra 3 and the Samsung Exynos 4412, two other quad core SoCs.
The MK810 is currently selling for under $100 with free international shipping on AliExpress.
<Update>There seems to be 2 versions of the MK810 currently on sale by various online retailers. The first is the Allwinner A31 quad-core version above. The other is a cheaper and more common version that has an Amlogic AML8726 MX dual-core SoC.
Pricing on the A31 MK810 seems to have increased a lot and I can no longer find it for under $100. If you are looking for an A31 Android mini PC, the identical Kimdecent CS868 is a better buy.