AMD Accelerated Processing Unit
|Models||Desktop E2 Series|
|Cores||2 to 4|
|Transistors and fabrication process||32 nm 1.178b (Llano)
The AMD Accelerated Processing Unit (APU), formerly known as Fusion, is the marketing term for a series of 64-bit microprocessors from Advanced Micro Devices (AMD), designed to act as a central processing unit (CPU) and graphics accelerator unit (GPU) on a single chip.
AMD announced the first generation APUs, Llano for high-performance and Brazos for low-power devices in January 2011. The second generation Trinity for high-performance and Brazos-2 for low-power devices were announced in June 2012. The third generation Kaveri for high performance devices was launched in January 2014, while Kabini and Temash for low-power devices were announced in the summer of 2013.
- 1 History
- 2 Features
- 3 APU-branded platforms
- 3.1 TeraScale-based GPU
- 3.2 Graphics Core Next-based GPU
- 3.2.1 Jaguar architecture (2013): Kabini and Temash
- 3.2.2 Steamroller architecture (2014): Kaveri
- 3.2.3 Puma architecture (2014): Beema and Mullins
- 3.2.4 Puma+ architecture (2015): Carrizo-L (laptop and mobile processors)
- 3.2.5 Excavator architecture (2015): Carrizo (laptop and mobile processors)
- 3.2.6 Steamroller architecture (Q2–Q3 2015): Godavari (desktop Kaveri refresh)
- 3.2.7 Excavator architecture (2016): Bristol Ridge and Stoney Ridge
- 3.2.8 Zen architecture (2017): Raven Ridge
- 4 See also
- 5 References
- 6 External links
The AMD Fusion project started in 2006 with the aim of developing a system on a chip that combined a CPU with a GPU on a single die. AMD took a key step toward realising such a vision when it acquired the graphics chipset manufacturer ATI in 2006. The project reportedly required three internal iterations of the Fusion concept to create a product deemed worthy of release. Reasons contributing to the delay of the project include the technical difficulties of combining a CPU and GPU on the same die at a 45 nm process, and conflicting views on what the role of the CPU and GPU should be within the project.
The first generation desktop and laptop APU, codenamed Llano, was announced on January 4, 2011 at the 2011 CES show in Las Vegas and released shortly thereafter. It featured K10 CPU cores and a Radeon HD 6000-series GPU on the same die on the FM1 socket. An APU for low-power devices was announced as the Brazos platform, based on the Bobcat microarchitecture and a Radeon HD 6000-series GPU on the same die.
At a conference in January 2012, corporate fellow Phil Rogers announced that AMD would re-brand the Fusion platform as the Heterogeneous Systems Architecture (HSA), stating that "it's only fitting that the name of this evolving architecture and platform be representative of the entire, technical community that is leading the way in this very important area of technology and programming development." However, it was later revealed that AMD had been the subject of a trademark infringement lawsuit by the Swiss company Arctic, who used the name "Fusion" for a line of power supply products.
The second generation desktop and laptop APU, codenamed Trinity was announced at AMD's 2010 Financial Analyst Day and released in October 2012. It featured Piledriver CPU cores and Radeon HD 7000 Series GPU cores on the FM2 socket. AMD released a new APU based on the Piledriver microarchitecture on March 12, 2013 for Laptops/Mobile and on June 4, 2013 for desktops under the codename Richland. The second generation APU for low-power devices, Brazos 2.0, used exactly the same APU chip, but ran at higher clock speed and rebranded the GPU as Radeon HD7000 series and used a new IO controller chip.
A third generation of the technology was released on 14 January 2014, featuring greater integration between CPU and GPU. The desktop and laptop variant is codenamed Kaveri, based on Steamroller architecture, while the low-power variants, codenamed Kabini and Temash, are based on Jaguar architecture.
AMD Heterogeneous System Architecture
AMD is a founding member of the Heterogeneous System Architecture (HSA) Foundation and is consequently actively working on developing HSA in cooperation with other members. The following hardware and software implementations are available in AMD's APU-branded products:
|Type||HSA feature||First implemented||Notes|
|Optimized Platform||GPU Compute C++ Support||2012
|Support OpenCL C++ directions and Microsoft’s C++ AMP language extension. This eases programming of both CPU and GPU working together to process support parallel workloads.|
|HSA-aware MMU||GPU can access the entire system memory through the translation services and page fault management of the HSA MMU.|
|Shared Power Management||CPU and GPU now share the power budget. Priority goes to the processor most suited to the current tasks.|
|Architectural Integration||Heterogeneous Memory Management: the CPU's MMU and the GPU's IOMMU share the same address space.||2014
|CPU and GPU now access the memory with the same address space. Pointers can now be freely passed between CPU and GPU, hence enabling zero-copy.|
|Fully coherent memory between CPU & GPU||GPU can now access and cache data from coherent memory regions in the system memory, and also reference the data from CPU's cache. Cache coherency is maintained.|
|GPU uses pageable system memory via CPU pointers||GPU can take advantage of the shared virtual memory between CPU and GPU, and pageable system memory can now be referenced directly by the GPU, instead of being copied or pinned before accessing.|
|System Integration||GPU compute context switch||2015
|Compute tasks on GPU can be context switched, allowing a multi-tasking environment and also faster interpretation between applications, compute and graphics.|
|GPU graphics pre-emption||Long-running graphics tasks can be pre-empted so processes have low latency access to the GPU.|
|Quality of service||In addition to context switch and pre-emption, hardware resources can be either equalized or prioritized among multiple users and applications.|
|Brand||Llano||Trinity||Richland||Kaveri||Carrizo||Bristol Ridge||Raven Ridge||Desna, Ontario, Zacate||Kabini, Temash||Beema, Mullins||Carrizo-L||Stoney Ridge|
|Platform||Desktop, Mobile||Mobile||Desktop, Mobile||Ultra-mobile|
|Released||Aug 2011||Oct 2012||Jun 2013||Jan 2014||Jun 2015||Jun 2016||TBA||Jan 2011||May 2013||Q2 2014||May 2015||June 2016|
|Fab. (nm)||GlobalFoundries 32 SOI||28||14||TSMC 40||28|
|Die size (mm2)||228||246||245||244.62||250.04||TBA||75 (+ 28 FCH)||~107||TBA||125|
|Socket||FM1, FS1||FM2, FS1+, FP2||FM2+, FP3||FM2+, FP4||AM4, FP4||AM4, FP5||FT1||AM1, FT3||FT3b||FP4||FP4|
|CPU architecture||AMD 10h||Piledriver||Steamroller||Excavator||Zen||Bobcat||Jaguar||Puma||Puma+||Excavator|
|3D engine[a]||TeraScale (VLIW5)||TeraScale (VLIW4)||GCN 2nd Gen (Mantle, HSA)||GCN 3rd Gen (Mantle, HSA)||GCN 5th Gen (Mantle, HSA)||TeraScale (VLIW5)||GCN 2nd Gen||GCN 3rd Gen|
|Up to 400:20:8||Up to 384:24:6||Up to 512:32:8||TBA||80:8:4||128:8:4||Up to 192:?:?|
|Unified Video Decoder||UVD 3||UVD 4.2||UVD 6||TBA||UVD 3||UVD 4||UVD 4.2||UVD 6||UVD 6.3|
|Video Coding Engine||N/A||VCE 1.0||VCE 2.0||VCE 3.1||TBA||N/A||VCE 2.0||VCE 3.1|
|GPU power saving||PowerPlay||PowerTune||N/A||PowerTune|
AMD APUs have a unique architecture: they have AMD CPU modules, cache, and a discrete-class graphics processor all on the same die, using the same bus. This architecture allows for the use of graphics accelerators, such as OpenCL, with the integrated graphics processor. The goal is to create a "fully integrated" APU, which, according to AMD will eventually feature 'heterogeneous cores' capable of processing both CPU and GPU work automatically, depending on the workload requirement.
K10 architecture (2011): Llano
- "Stars" AMD K10-cores
- Integrated Evergreen/VLIW5-based GPU (branded Radeon HD 6000 Series)
- DDR3 memory controller to arbitrate between coherent and non-coherent memory requests. The physical memory is partitioned between the GPU (up to 512 MB) and the CPU (the remainder).
- Unified Video Decoder
- AMD Eyefinity multi-monitor-support
The first generation APU, released in June 2011, was used in both desktops and laptops. It was based on the K10 architecture and built on a 32 nm process featuring two to four CPU cores on a TDP of 65-100 W, and integrated graphics based on the Radeon HD6000 Series with support for DirectX 11, OpenGL 4.2 and OpenCL 1.2. In performance comparisons against the similarly priced Intel Core i3-2105, the Llano APU was criticised for its poor CPU performance and praised for its better GPU performance. AMD was later criticised for abandoning Socket FM1 after one generation.
Bobcat architecture (2011): Ontario, Zacate, Desna, Hondo
- Bobcat-based CPU
- Evergreen/VLIW5-based GPU (branded Radeon HD 6000 Series and Radeon HD 7000 Series)
- PCIe support.
- DDR3 SDRAM memory controller to arbitrate between coherent and non-coherent memory requests. The physical memory is partitioned between the GPU (up to 512 MB) and the CPU (the remainder).
- Unified Video Decoder (UVD)
The AMD Brazos platform was introduced on January 4, 2011 targeting the subnotebook, netbook and low power small form factor markets. It features the 9-watt AMD C-Series APU (codename: Ontario) for netbooks and low power devices as well as the 18-watt AMD E-Series APU (codename: Zacate) for mainstream and value notebooks, all-in-ones and small form factor desktops. Both APUs feature one or two Bobcat x86 cores and a Radeon Evergreen Series GPU with full DirectX11, DirectCompute and OpenCL support including UVD3 video acceleration for HD video including 1080p.
AMD expanded the Brazos platform on June 5, 2011 with the announcement of the 5.9-watt AMD Z-Series APU (codename: Desna) designed for the Tablet market. The Desna APU is based on the 9-watt Ontario APU. Energy savings were achieved by lowering the CPU, GPU and north bridge voltages, reducing the idle clocks of the CPU and GPU as well as introducing a hardware thermal control mode. A bidirectional turbo core mode was also introduced.
AMD announced the Brazos-T platform on October 9, 2012. It comprised the 4.5-watt AMD Z-Series APU (codename: Hondo) and the A55T Fusion Controller Hub (FCH), designed for the tablet computer market. The Hondo APU is a redesign of the Desna APU. AMD lowered energy use by optimizing the APU and FCH for tablet computers.
The Deccan platform including Krishna and Wichita APUs were cancelled in 2011. AMD originally planned to release them in the second half 2012.
Piledriver architecture (2012): Trinity and Richland
- Piledriver-based CPU
- Northern Islands/VLIW4-based GPU (branded Radeon HD 7000 and 8000 Series)
- Unified Northbridge includes AMD Turbo Core 3.0, which enables automatic bi-directional power management between CPU modules and GPU. Power to the CPU and GPU is controlled automatically by changing the clock rate depending on the load. For example, for a non-overclocked A10-5800K APU the CPU frequency can change from 1.4 GHz to 4.2 GHz, and the GPU frequency can change from 304 MHz to 800 MHz. In addition, CC6 mode is capable of powering down individual CPU cores, while PC6 mode is able to lower the power on the entire rail."
- AMD HD Media Accelerator - includes AMD Perfect Picture HD, AMD Quick Stream technology, and AMD Steady Video technology.
- Display controllers: AMD Eyefinity-support for multi-monitor set-ups, HDMI, DisplayPort 1.2, DVI
Trinity The first iteration of the second generation platform, released in October 2012, brought improvements to CPU and GPU performance to both desktops and laptops. The platform features 2 to 4 Piledriver CPU cores built on a 32 nm process with a TDP between 65 W and 100 W, and a GPU based on the Radeon HD7000 Series with support for DirectX 11, OpenGL 4.2, and OpenCL 1.2. The Trinity APU was praised for the improvements to CPU performance compared to the Llano APU.
- "Enhanced Piledriver" CPU cores
- Temperature Smart Turbo Core technology. An advancement of the existing Turbo Core technology, which allows internal software to adjust the CPU and GPU clock speed to maximise performance within the constrains of the Thermal design power of the APU.
- New low-power consumption CPUs with only 45 W TDP
Graphics Core Next-based GPU
Jaguar architecture (2013): Kabini and Temash
- Jaguar (microarchitecture)-based CPU
- First Graphics Core Next-based GPU ("Sea Islands"), branded as "AMD Radeon R3 Graphics", supports the Mantle API
- Socket FT3 and Socket AM1 support
In January 2013 the Jaguar-based Kabini and Temash APUs were unveiled as the successors of the Bobcat-based Ontario, Zacate and Hondo APUs. The Kabini APU is aimed at the low-power, subnotebook, netbook, ultra-thin and small form factor markets, the Temash APU is aimed at the tablet, ultra-low power and small form factor markets. The two to four Jaguar cores of the Kabini and Temash APUs feature numerous architectural improvements regarding power requirement and performance, such as support for newer x86-instructions, a higher IPC count, a CC6 power state mode and clock gating. Kabini and Temash are AMD's first, and also the first ever quad-core x86 based SoCs. The integrated Fusion Controller Hubs (FCH) for Kabini and Temash are codenamed "Yangtze" and "Salton" respectively. The Yangtze FCH features support for two USB 3.0 ports, two SATA 6 Gbit/s ports, as well as the xHCI 1.0 and SD/SDIO 3.0 protocols for SD-card support. Both chips feature DirectX 11.1-compliant GCN-based graphics as well as numerous Heterogeneous System Architecture (HSA) improvements. They were fabricated at a 28 nm process in an FT3 BGA package by TSMC, and were released on May 23, 2013.
Steamroller architecture (2014): Kaveri
- Steamroller (microarchitecture)-based CPU with 2–4 cores
- Graphics Core Next-based GPU ("Sea Islands") with 192–512 shader processors (branded "Radeon R4/5/6/7 Graphics"). 3.7 GHz (boost 4.0 GHz) with DirectX 12 support
- 15–95 W TDP
- Fastest laptop processor of this series: 35 W AMD FX-7600P laptop processor
- Fastest desktop processor of this series: 95 W AMD A10-7850K desktop processor
- Desktop processor uses Socket FM2+
- Heterogeneous System Architecture-enabled zero-copy through pointer passing
The third generation of the platform, codenamed Kaveri, was partly released on January 14, 2014. Kaveri contains up to four Steamroller CPU cores clocked to 3.9 GHz with a turbo mode of 4.1 GHz, up to a 512-core Graphics Core Next GPU, two decode units per module instead of one (which allows each core to decode four instructions per cycle instead of two), AMD TrueAudio, Mantle API, an on-chip ARM Cortex-A5 MPCore, and will release with a new socket, FM2+. Ian Cutress and Rahul Garg of Anandtech asserted that Kaveri represented the unified system-on-a-chip realisation of AMD's acquisition of ATI. The performance of the 45W A8-7600 Kaveri APU was found to be similar to that of the 100W Richland part, leading to the claim that AMD made significant improvements in on-die graphics performance per watt; however, CPU performance was found to lag behind similarly-specified Intel processors, a lag that was unlikely to be resolved in the Bulldozer family APUs. The A8-7600 component was delayed from a Q1 launch to an H1 launch because the Steamroller architecture components are alleged to not scale well at higher clock speeds.
AMD announced the release of the Kaveri APU for the mobile market on June 4, 2014 at Computex 2014, shortly after the accidental announcement on the AMD website on May 26, 2014. The announcement included components targeted at the standard voltage, low-voltage, and ultra-low voltage segments of the market. In early-access performance testing of a Kaveri prototype laptop, AnandTech found that the 35W FX-7600P was competitive with the similarly-priced 17W Intel i7-4500U in synthetic CPU-focused benchmarks, and was significantly better than previous integrated GPU systems on GPU-focused benchmarks. Tom's Hardware reported the performance of the Kaveri FX-7600P against the 35W Intel i7-4702MQ, finding that the i7-4702MQ was significantly better than the FX-7600P in synthetic CPU-focused benchmarks, whereas the FX-7600P was significantly better than the i7-4702MQ's Intel HD 4600 iGPU in the four games that could be tested in the time available to the team.
Puma architecture (2014): Beema and Mullins
- Puma (microarchitecture)-based CPU
- Graphics Core Next-based GPU ("Sea Islands") with 128 shader processors (branded "AMD Radeon R3 Graphics" 600 MHz, and "R4 Graphics" 800 MHz), supports the Mantle API
- Socket FT3 support
Puma+ architecture (2015): Carrizo-L (laptop and mobile processors)
- Puma+ (microarchitecture)-based CPU with 2–4 cores 
- Graphics Core Next-based GPU ("Sea Islands") with 128 shader processors (branded "AMD Radeon R3/R4/R5 Graphics" in different APU models)
- 12–25 W configurable TDP
- Socket FP4 support, pin-compatible with Carrizo 
Excavator architecture (2015): Carrizo (laptop and mobile processors)
- Excavator (microarchitecture)-based CPU with 4 cores
- Graphics Core Next-based GPU ("Sea Islands")
- Memory controller supported DDR3 SDRAM
- 15–35 W configurable TDP (with the 15W cTDP unit having reduced performance)
- Integrated southbridge
- Announced by AMD on YouTube (Nov 19 2014)
Steamroller architecture (Q2–Q3 2015): Godavari (desktop Kaveri refresh)
- Steamroller (microarchitecture)-based CPU with 4 cores
- Graphics Core Next-based GPU ("Sea Islands").
- Memory controller supports DDR3 SDRAM at 2133 MHz
- Socket FM2+
- 95 W TDP
Excavator architecture (2016): Bristol Ridge and Stoney Ridge
- Excavator (microarchitecture)-based CPU with 2–4 cores
- 1 MB L2 cache per module
- Graphics Core Next-based GPU, 3rd generation ("Volcanic Islands"), Radeon graphics 
- Memory controller supports DDR4 SDRAM
- 15/35/45/65 W TDP with support for configurable TDP
Zen architecture (2017): Raven Ridge
- Zen-based CPU cores with SMT (simultaneous multithreading)
- Memory controller supports DDR4 SDRAM
- Vega based GPU
- 512 KB L2 cache per core
- Q4 2017
- AMD Bulldozer
- AMD mobile platform
- List of AMD Accelerated Processing Unit microprocessors
- List of AMD mobile microprocessors
- Unified Video Decoder
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