Kryo

Qualcomm's Kryo is the brand name of a series of custom or semi-custom ARM-based CPUs. These CPUs implement the ARMv8-A 64-bit instruction set, and serve as the successor to the older 32-bit Krait core.

First announced in September 2015 and used in the Snapdragon 820 SoC, which is manufactured in Samsung's 14 nm FinFET process. The Kryo cores can be used in both parts of the big.LITTLE configuration, where two dual-core clusters (in the case of Snapdragon 820 and 821) run at different clock frequency, similar to how both Cortex-A53 clusters work in the Snapdragon 615.

A new generation of this microarchitecture, named Kryo 280, was announced along with the Snapdragon 835 chipset in November 2016. The Kryo 280 CPU core is not a derivative of the original Kryo, but rather is a customized derivative of the ARM's Cortex-A73. The new core improves integer instructions per clock , while having much lower performance at floating point math relative to the original Kryo.

Kryo 260 was announced along with the Snapdragon 660 chipset for mid-range smartphone in May 2017. This CPU is a combination of four semi-custom Cortex-A73 cores (the performance cluster) and four semi-custom Cortex-A53 cores (the efficiency cluster) in a big.LITTLE arrangement. Kryo 260 uses 1MB/1MB of shared L2 per cluster and it is built on a 14nm process..

The Kryo 385 was announced as a part of the Snapdragon 845 in December 2017. Built on a 10nm process the SoC contains eight semi-custom cores, 4 high-performance "Gold" cores and 4 efficiency "Silver" cores in a big.LITTLE arrangement. The Gold cores are derived from the Cortex-A75, run at upto 2.8GHz, and have a total of 1MB of L2 cache. The Silver cores are Cortex-A55 derived, run at up to 1.8GHz, and have a total of 512KB of L2 cache. There is an additional 2MB L3 cache on the chip. Qualcomm expected 25-30% increased performance in task run on the high-performance cores, and 15% increase on efficiency cores, relative to the Snapdragon 835.

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