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Concept
Excavator (microarchitecture)
Summary
AMD Excavator Family 15h is a microarchitecture developed by AMD to succeed Steamroller Family 15h for use in AMD APU processors and normal CPUs. On October 12, 2011, AMD revealed Excavator to be the code name for the fourth-generation Bulldozer-derived core.
The Excavator-based APU for mainstream applications is called Carrizo and was released in 2015.
The Carrizo APU is designed to be HSA 1.0 compliant.
An Excavator-based APU and CPU variant named Toronto for server and enterprise markets was also produced.
Excavator was the final revision of the "Bulldozer" family, with two new microarchitectures replacing Excavator a year later.
Excavator was succeeded by the x86-64 Zen architecture in early 2017.
Excavator added hardware support for new instructions such as AVX2, BMI2 and RDRAND.
Excavator is designed using High Density (aka "Thin") Libraries normally used for GPUs to reduce electric energy consumption and die size, delivering a 30 percent increase in efficient energy use. Excavator can process up to 15% more instructions per clock compared to AMD's previous core Steamroller.
List of AMD processors with 3D graphics
There are three APU lines announced or released:
Budget and mainstream markets (desktop and mobile): Carrizo APU
The Carrizo mobile APUs were launched in 2015 based on Excavator x86 cores and featuring Heterogeneous System Architecture for integrated task sharing between CPUs and GPUs, which allows a GPU to perform compute functions, which is claimed provide greater performance increases than shrinking the feature size alone.
Carrizo desktop APUs were launched in 2018. The mainstream product (A8-7680) has 4 Excavator cores and a GPU based on GCN1.2 architecture. Also, an entry-level APU (A6-7480) with 2 Excavator cores is also launched.
Budget and mainstream markets (desktop and mobile): Bristol Ridge, and Stoney Ridge (for entry level notebooks), APUs
Bristol Ridge APUs utilize socket AM4 and DDR4 RAM
Bristol Ridge APUs have up to 4 Excavator CPU cores and up to 8 3rd generation GCN GPU cores
Up to a 20% CPU performance increase over Carrizo
TDP of 15W to 65W, 15–35W for mobile
Enterprise and server markets: Toronto APU
The Toronto APU for server and enterprise markets featured four x86 Excavator CPU core modules and Volcanic Islands integrated GPU core.
Official source
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