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The R520 (codenamed Fudo) is a Graphics processing unit (GPU) developed by ATI Technologies and produced by TSMC. It was the first GPU produced using a 90 nmphotolithography process.

The R520 is the foundation for a line of DirectX 9.0c and OpenGL 2.0 3D accelerator X1000 video cards. It is ATI's first major architectural overhaul since the R300 and is highly optimized for Shader Model 3.0. The Radeon X1000 series using the core was introduced on October 5, 2005, and competed primarily against nVidia's GeForce 7000 series. ATI released the successor to the R500 series with the R600 series on May 14, 2007.

ATI does not provide official support for any X1000 series cards for Windows 8 or Windows 10; the last AMD Catalyst for this generation are the 10.2 from 2010 up to Windows 7.^[1] However, AMD stopped providing drivers for Windows 7 for this series in 2015.^[2]

Using a Linux distribution a series of open source Radeon drivers are available.

The same GPUs are also found in some AMD FireMV products targeting multi-monitor set-ups.

• 4Variants

Delay during the development[edit]

The Radeon X1800 video cards, that included a R520, were released with a delay of several months because ATI engineers discovered a bug within the GPU in a very late stage of the development. This bug, caused by a faulty 3rd party 90 nm chip design library, greatly hampered clock speed ramping, so they had to 'respin' the chip for another revision (a new GDSII had to be sent to TSMC). The problem had been almost random in how it affected the prototype chips, making it quite difficult to finally identify.

Architecture[edit]

The R520 architecture is referred to by ATI as an 'Ultra Threaded Dispatch Processor'. This refers to ATI's plan to boost the efficiency of their GPU, instead of going with a brute force increase in the number of processing units. A central pixel shader 'dispatch unit' breaks shaders down into threads (batches) of 16 pixels (4×4) and can track and distribute up to 128 threads per pixel 'quad' (4 pipelines each). When one of the shader quads becomes idle, due to a completion of a task or waiting for other data, the dispatch engine will assign the quad with another task to do in the meantime, with the overall result being a greater utilization of the shader units, theoretically. With such a large number of threads per 'quad', ATI created a very large general purpose register array that is capable of multiple concurrent reads and writes and has a high-bandwidth connection to each shader array. This provides temporary storage necessary to keep the pipelines fed by having work available as much as possible. With chips such as RV530 and R580, where the number of shader units per pipeline triples, the efficiency of pixel shading drops off slightly because these shaders still have the same level of threading resources as the less endowed RV515 and R520.^[3]

The next major change to the core is with its memory bus. R420 and R300 had nearly identical memory controller designs, with the former being a bug fixed release designed for higher clock speeds. R520, however, differs with its central controller (arbiter) that connects to the 'memory clients'. Around the chip there are two 256-bit ring buses running at the same speed as the DRAM chips, but in opposite directions to reduce latency. Along these ring buses are 4 'stop' points where data exits the ring and going into or out of the memory chips. There is actually a fifth stop, one that is significantly less complex, designed for the PCI Express interface and video input. This design allows memory accesses to be far quicker though lower latency by virtue of the smaller distance the signals need to move through the GPU, and by increasing the number of banks per DRAM. Basically the chip can spread out memory requests faster and more directly to the RAM chips. ATI claims a 40% improvement in efficiency over older designs. Again, the smaller cores such as RV515 and RV530 receive cutbacks due to their smaller, less costly designs. RV530, for example, has two internal 128-bit buses instead. This generation has support for all recent memory types, including GDDR4. In addition to ring bus, each memory channel now has the granularity of 32-bits, which improves memory efficiency when performing small memory requests.^[3]

The vertex shader engines were already of the required FP32 precision in ATI's older products. Changes necessary for SM3.0 included longer instruction lengths, dynamic flow control instructions, with branches, loops and subroutines and a larger temporary register space. The pixel shader engines are actually quite similar in computational layout to their R420 counterparts, although they were heavily optimized and tweaked to reach high clock speeds on the 90 nm process. ATI has been working for years on a high-performance shader compiler in their driver for their older hardware, so staying with a similar basic design that is compatible offered obvious cost and time savings.^[3]

At the end of the pipeline, the texture addressing processors are now decoupled from pixel shader, so any unused texturing units can be dynamically allocated to pixels that need more texture layers. Other improvements include 4096x4096 texture support and ATI's 3Dc normal map compression sees an improvement in compression ratio for more specific situations.^[3]

The R5xx family introduced a more advanced onboard motion-video engine. Like the Radeon cards since the R100, the R5xx can offload almost the entire MPEG-1/2 video pipeline. The R5xx can also assist in Microsoft WMV9/VC-1 and MPEG H.264/AVC decoding, by a combination of the 3D/pipeline's shader-units and the motion-video engine. Benchmarks show only a modest decrease in CPU-utilization for VC-1 and H.264 playback.

As is typical for an ATI video card release, a selection of real-time 3D demonstration programs were released at launch. ATI's development of their 'digital superstar', Ruby, continued with a new demo named The Assassin. The demo showcased a highly complex environment, with high dynamic range lighting (HDR) and dynamic soft shadows. Ruby's latest nemesis, Cyn, was composed of 120,000 polygons.^[4]

The cards support dual-link DVI output and HDCP. However, using HDCP requires external ROM to be installed, which were not available for early models of the video cards. RV515, RV530, RV535 cores include 1 single and 1 double DVI link; R520, RV560, RV570, R580, R580+ cores include 2 double DVI links.

AMD has released the final Radeon R5xx Acceleration document.^[5]

Drivers[edit]

Last AMD Catalyst version that officially supports this series, is 10.2, with the display driver version 8.702.

Variants[edit]

X1300–X1550 series[edit]

This series is the budget solution of the X1000 series and is based on the RV515 core. The chips have 4 texture units, 4 ROPs, 4 pixel shaders, and 2 vertex shaders, similar to the older X300 – X600 cards. These chips basically use 1 'quad' (referring to 4 pipelines) of a R520, whereas the faster boards use just more of these 'quads'. For example, the X1800 uses 4 'quads'. This modular design allows ATI to build a 'top to bottom' line-up using identical technology, saving research and development time and money. Because of its smaller design, these cards also offer lower power demands (30 watts), so they run cooler and can be used in smaller cases.^[3]Eventually, ATI created the X1550, little more than an X1300 in disguise, and discontinued the X1300. The X1050 was based on the R300 core and was sold as an ultra-low-budget part.

Early Mobility Radeon X1300 to X1450 are based around the RV515 core as well.^[6][7][8][9]Brother mfc print driver for mac.

Beginning in 2006, Radeon X1300 and X1550 products were shifted to the RV505 core, which had similar capabilities and features as the previous RV515 core, but was manufactured by TSMC using an 80 nm process (reduced from the 90 nm process of the RV515).^[10]

X1600 series[edit]

X1600 uses the M56^[1] core which is based on RV530 core, a core similar but distinct from RV515.

The RV530 has a 3:1 ratio of pixel shaders to texture units. It possesses 12 pixel shaders while retaining RV515's 4 texture units and 4 ROPs. It also gains three extra vertex shaders, bringing the total to 5 units. The chip's single 'quad' has 3 pixel shader processors per pipeline, similar to the design of R580's 4 quads. This means that RV530 has the same texturing ability as the X1300 at the same clock speed, but with its 12 pixel shaders it encroaches on X1800's territory in shader computational performance. Unfortunately, due to the programming content of available games, the X1600 is greatly hampered by lack of texturing power.^[3]

The X1600 was positioned to replace Radeon X600 and Radeon X700 as ATI's mid-range GPU. The Mobility Radeon X1600 and X1700 are also based on RV530.^[11][12]

X1650 series[edit]

The X1650 series has two parts, which are quite different with regards to performance. The X1650 Pro uses the RV535 core (which is a RV530 core manufactured on the newer 80 nm process). Its advantage over X1600 is both lower power consumption and heat output.^[13]

The other part, the X1650XT, uses the newer RV570 core (also known as the RV560) although cut down in processing power (note that the fully equipped RV570 core powers the X1950Pro, a high-performance card) to match its main competitor, NVIDIA's 7600GT.^[14]

X1800 series[edit]

Originally the flagship of the X1000 series, the X1800 series was released with little fanfare due to the rolling release and the gain by its competitor at that time, NVIDIA's GeForce 7 Series. When the X1800 hit the market in late 2005, it was the first high-end video card with a 90 nm GPU. ATI opted to fit the cards with either 256 MiB or 512 MiB on-board memory (foreseeing a future of ever growing demands on local memory size). The X1800XT PE was exclusively on 512 MiB on-board memory. The X1800 replaced the R480-based Radeon X850 as ATI's premier performance GPU.^[3]

With R520's delayed release, its competition was far more impressive than it would have been if the chip had made its originally scheduled Spring/Summer '05 release. Like its predecessor X850, the R520 chip carries 4 'quads' (4 pipelines each), which means it has similar texturing capability if at the same clock speed as its ancestor, and the NVIDIA 6800 series. Contrasting the X850 however, R520's shader units are vastly improved. Not only are they fully Shader Model 3 capable, but ATI introduced some innovative advancements in shader threading that can greatly improve the efficiency of the shader units. Unlike the X1900, the X1800 has 16 pixel shader processors as well, and equal ratio of texturing to pixel shading capability. The chip also ups the vertex shader number from 6 on X800 to 8. And, with the use of the 90 nm Low-K fabrication process, these high-transistor chips could still be clocked at very high frequencies. This is what gives the X1800 series the ability to be competitive with GPUs with more pipelines but lower clock speeds, such as the NVIDIA 7800 and 7900 series that use 24 pipelines.^[3]

X1800 was quickly replaced by X1900 because of its delayed release. X1900 was not behind schedule, and was always planned as the 'spring refresh' chip. However, due to the large quantity of unused X1800 chips, ATI decided to kill 1 quad of pixel pipelines and sell them off as the X1800GTO.

The Xbox 360 uses a custom graphics processing unit called Xenos, which is similar to the X1800 XT.

X1900 and X1950 series[edit]

The X1900 and X1950 series fixes several flaws in the X1800 design and adds a significant pixel shading performance boost. The R580 core is pin compatible with the R520 PCBs meaning that a redesign of the X1800 PCB was not needed. The boards carry either 256 MiB or 512 MiB of onboard GDDR3 memory depending on the variant. The primary change between R580 and R520 is that ATI changed the pixel shader processor to texture processor ratio. The X1900 cards have 3 pixel shaders on each pipeline instead of 1, giving a total of 48 pixel shader units. ATI has taken this step with the expectation that future 3D software will be more pixel shader intensive.^[15]

In the latter half of 2006, ATI introduced the Radeon X1950 XTX. This is a graphics board using a revised R580 GPU called R580+. R580+ is the same as R580 except for support of GDDR4 memory, a new graphics DRAM technology that offers lower power consumption per clock and offers a significantly higher clock rate ceiling. X1950 XTX clocks its RAM at 1 GHz (2 GHz DDR), providing 64.0 GB/s of memory bandwidth, a 29% advantage over the X1900 XTX. The card was launched on August 23, 2006.^[16]

The X1950 Pro was released on October 17, 2006 and was intended to replace the X1900GT in the competitive sub-$200 market segment. The X1950 Pro GPU is built from the ground up on the 80 nm RV570 core with only 12 texture units and 36 pixel shaders. The X1950 Pro is the first ATI card that supports native Crossfire implementation by a pair of internal Crossfire connectors, which eliminates the need for the unwieldy external dongle found in older Crossfire systems.^[17]

Radeon Feature Matrix[edit]

The following table shows features of Radeon-branded GPU microarchitectures.

1. ^The Radeon 100 Series has programmable pixel shaders, but do not fully comply with DirectX 8 or Pixel Shader 1.0. See article on R100's pixel shaders.
2. ^These series do not fully comply with OpenGL 2+ as the hardware does not support all types of non-power of two (NPOT) textures.
3. ^OpenGL 4+ compliance requires supporting FP64 shaders and these are emulated on some TeraScale chips using 32-bit hardware.
4. ^ ^abThe UVD and VCE were replaced by the Video Core Next (VCN) ASIC in the Raven Ridge APU implementation of Vega.
5. ^ ^abTo play protected video content, it also requires card, operating system, driver, and application support. A compatible HDCP display is also needed for this. HDCP is mandatory for the output of certain audio formats, placing additional constraints on the multimedia setup.
6. ^More displays may be supported with native DisplayPort connections, or splitting the maximum resolution between multiple monitors with active converters.
7. ^ ^abDRM (Direct Rendering Manager) is a component of the Linux kernel. Support in this table refers to the most current version.

Chipset table[edit]

See also[edit]

References[edit]

1. ^'Radeon X1K Real-Time Demos'. Archived from the original on May 7, 2009.Cite uses deprecated parameter deadurl= (help); Cite web requires website= (help)
2. ^'Download AMD Drivers'.Cite web requires website= (help)
3. ^ ^abcdefghWasson, Scott. ATI's Radeon X1000 series graphics processors, Tech Report, October 5, 2005.
4. ^'AMD Catalyst™ Display Driver'.Cite web requires website= (help)
5. ^Advanced Micro Devices, Inc. Radeon R5xx Acceleration v. 1.5, AMD website, October 2013.
6. ^Mobility Radeon X1300Archived May 9, 2007, at the Wayback Machine, ATI. Retrieved June 8, 2007.
7. ^Mobility Radeon X1350Archived March 25, 2007, at the Wayback Machine, ATI. Retrieved June 8, 2007.
8. ^Mobility Radeon X1400Archived June 15, 2007, at the Wayback Machine, ATI. Retrieved June 8, 2007.
9. ^Mobility Radeon X1450Archived June 3, 2007, at the Wayback Machine, ATI. Retrieved June 8, 2007.
10. ^The Inquirer, 16 November 2006: AMD samples 80nm RV505CE – finally (cited February 4, 2011)
11. ^Mobility Radeon X1700Archived May 26, 2007, at the Wayback Machine, ATI. Retrieved June 8, 2007.
12. ^Mobility Radeon X1600Archived June 22, 2007, at the Wayback Machine, ATI. Retrieved June 8, 2007.
13. ^Hanners. PowerColor Radeon X1650 PRO video card review, Elite Bastards, August 27, 2006.
14. ^Wasson, Scott. ATI's Radeon X1650 XT graphics card, Tech Report, October 30, 2006.
15. ^Wasson, Scott. ATI's Radeon X1900 series graphics cards, Tech Report, January 24, 2006.
16. ^Wasson, Scott. ATI's Radeon X1950 XTX and CrossFire Edition graphics cards, Tech Report, August 23, 2006.
17. ^Wilson, Derek. ATI Radeon X1950 Pro: CrossFire Done Right, AnandTech, October 17, 2006.
18. ^ ^abKillian, Zak (March 22, 2017). 'AMD publishes patches for Vega support on Linux'. Tech Report. Retrieved March 23, 2017.Cite news requires newspaper= (help)
19. ^'Radeon's next-generation Vega architecture'(PDF). Radeon Technologies Group (AMD). Retrieved June 13, 2017.Cite web requires website= (help)
20. ^Larabel, Michael (December 7, 2016). 'The Best Features of the Linux 4.9 Kernel'. Phoronix. Retrieved December 7, 2016.Cite web requires website= (help)

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