Qualcomm Snapdragon 625 vs Qualcomm Snapdragon 821 MSM8996 Pro vs Qualcomm Snapdragon 435

Qualcomm Snapdragon 625

The Qualcomm Snapdragon 625 (SD625) is a mid-range octa-core SoC with eight ARM Cortex-A53 cpu cores at up to 2 GHz, an Adreno 506 GPU, a DDR3L-1866 memory controller and a X9 LTE (Cat 7, 4G+, 300 Mbps down, 150 Mbps up) modem. Furthermore, the chip supports 802.11ac WiFi and Bluetooth 4.1. It is manufactured in 14nm FinFet. The processor performance should be similar to a HiSilicon Kirin 650, which also offers 8 Cortex A53 cores at up to 2 GHz. However, due to the modern manufacturing process, power consumption and throttling should be better with the Snapdragon 625.

Qualcomm Snapdragon 821 MSM8996 Pro

The Qualcomm Snapdragon 821 MSM8996 is a high-end ARM-based SoC largely found on Android tablets and smartphones. Announced in mid 2016, the S820 is the successor to the Snapdragon 820 and from a technical perspective a higher clocked version of the SoC. In addition to 4 CPU cores (two slower clocked and two faster clocked Kryo cores), the SoC integrates an Adreno 530 GPU with a LPDDR4 memory controller  and supports Wi-Fi (802.11ad + MIMO), Bluetooth 4.1, and LTE.

CPU

The Snapdragon 821 is based on a similar concept as ARM's big.LITTLE, which combines a low power CPU cluster (2x Kyro clocked at up to 1.6 GHz?) and a performance CPU cluster (2x Kyro clocked at up to 2.4 GHz). The clock speed of each cluster can be individually adjusted (but not per core) and the lowest clock speed is 310 MHz. The performance cluster features 1 MB L2 cache and the power saving one 512 KB. Both should be using the same architecture and fully support the ARMv8-ISA instruction set.

Although only four cores are used, the performance of the 821 is located in the high end of mobile CPUs for smartphones and tablets. The performance advantage of the 821 compared to the 820 depends on the used clock speed. E.g. in the Google Pixel, the SoC is only clocked at 2.15 GHz and therefore identical to many 820 SoCs.

GPU

The Adreno 530 outperforms the previous Adreno 430 especially in high demanding benchmarks. Therefore it is well suited of modern 3D games on Android devices and should rank slightly below the Tegra X1 GPU. Compared to the 530 in the 820, the 821 version should be up to 5 % faster, which speaks for a slightly higher clock speed.

Features

The Snapdragon 821 offers numerous wireless technologies such as Bluetooth 4.1, WLAN 802.11a/b/g/n/ac/ad (60 GHz) + MIMO as well as a dual-SIM cellular modem supporting LTE cat. 12/13 .

The SoC can encode and decode 4K videos using dedicated hardware (H.264 and H.265).

Power Consumption

Thanks to the new 14 nm process, the energy efficiency has been improved noticeably compared to its 20 nm predecessors.

Qualcomm Snapdragon 435

The Qualcomm Snapdragon 435 (SD435) is a lower mainstream SoC for (Android based) smartphones and tablets. Contrary to the Snapdragon 630, it is still manufactured in a 28-nm process and also consists of an octa-core CPU part with ARM Cortex-A53 cores. However, they are only clocked at up to 1.4 GHz. The integrated X9 LTE modem supports Cat. 4 with maximum transfer rates of 300 Mbps (downstream) and 100 Mbps (upstream). The SoC also includes an Adreno 505 GPU with support for Vulkan and OpenGL ES 3.1. WiFi 802.11ac and Bluetooth 4.1 are supported as well. The memory controller supports LPDDR3 clocked at 800 MHz (so probably dual-channel DDRL-1600). The main difference to the Snapdragon 430 is the faster LTE modem.