Matrox Parhelia

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Matrox Parhelia-512 is a GPU with full support for DirectX 8.1 and incorporating several DirectX 9.0 features. It was best known for its ability to drive three monitors ("Surround Gaming") and its Coral Reef tech demo.

Contents 1 Background 2 Description 2.1 Features 2.2 Video cards 2.3 Performance 2.4 Sales 3 Parhelia-LX 4 Future products 5 References 6 External links

[edit] Background

The Parhelia series was Matrox's attempt to return to the market after a long hiatus, their first significant effort since the G200 and G400 lines had become uncompetitive. Their other post-G400 products, G450 and G550, were cost-reduced revisions of "G400" technology and were not competitive with ATI's Radeon or NVIDIA's GeForce lines with regards to 3D computer graphics.

[edit] Description

[edit] Features

The Parhelia-512 was the first GPU by Matrox to be equipped with a 256-bit memory bus, giving it an advantage over other cards of the time in the area of memory bandwidth. The '-512' suffix refers to the 512-bit ring bus. The Parhelia processor featured Glyph acceleration, where anti-aliasing of text was accelerated by the hardware.

Parhelia-512 includes 4 32x4 vertex shaders with dedicated displacement mapping engine, pixel shader array with 4 texturing unit and 5-stage pixel shader per pixel pipeline. It supports 16x fragment anti-aliasing, all of which were featured prominently in Matrox's Coral Reef technical demo.

Display controller component supports 10-bit color frame buffer (called "Gigacolor") with 10-bit 400MHz RAMDACs on 2 RGB ports and 230MHz RAMDAC on TV encoder port, which was an improvement over its competitors. The frame buffer is in RGBA (10:10:10:2) format, and supports full gamma correction. Dual link TMDS is supported via external controller connected to the digital interface.

Memory controller supports 256-bit DDR SDRAM.

The "Surround Gaming" support allowed the card to drive three monitors creating a unique level gaming immersion. For example, in a flight simulator or sim racing, the middle monitor could show the windshield while the left and right monitors could display the side views (offering peripheral vision). However, only 2 displays can be controlled independently.^[1]

[edit] Video cards

The cards were released in 2002, simply called Matrox Parhelia, initially came with 128 or 256 MiB memory. Retail cards are clocked 220MHz core, 275MHz memory; OEM cards are clocked 200MHz core, 250MHz memory.^[2]

To further improve analog image quality, 5th order low-pass filters are used.

[edit] Performance

For a top-of-the-line, and rather expensive card ($399 USD), the Matrox Parhelia's 3D gaming performance was well behind NVIDIA's older and similarly priced GeForce 4 Ti 4600. The Parhelia was only competitive with the older Radeon 8500 and GeForce 3, which typically cost half as much. The Parhelia's potent performance was held back by its comparatively low GPU clock speed, which in turn was initially believed to be limited by its large number of transistors. However, ATI's Radeon 9700 was released later that year, with many more transistors (80 million vs. 108 million), all on the same 150 nm chip fabrication process, yet it had a much higher clock speed (250MHz vs. 325MHz).

The card's fillrate performance was only formidable if a game used many layers of textures because it was only equipped with 4 pixel pipelines, but each had 4 texture units. Unfortunately this did not turn out to be an optimal approach for games. Parhelia was also hampered by limited bandwidth saving technologies, while ATI had their 3rd generation HyperZ in Radeon 9700 and NVIDIA had their Lightning Memory Architecture 2 in GeForce 4. So, while the Parhelia had formidable memory bandwidth, much of it was wasted because the card didn't have the ability to efficiently prevent overdraw or compress z-buffer data, among other inefficiencies. Parhelia was also believed to have a crippled triangle-setup engine that starved the rest of the chip in typical 3D rendering tasks [1]. Some suggested that Matrox did not have engineering talent on par with NVIDIA and ATI and, as a result, their GPU was less efficient and less well designed overall.^{[weasel words]}

Later in Parhelia's life, when DirectX 9 applications were becoming quite prevalent, Matrox acknowledged that the vertex shaders were not Shader Model 2.0 capable, and as such not DirectX 9-compliant, as was initially advertised. Presumably there were several bugs within the Parhelia core that could not be worked around in the drivers. However, it was all a bit of a moot point because Parhelia's performance was not adequate to drive most DirectX 9-supporting titles well even without more complex shader code weighing the card down.

[edit] Sales

Despite the lackluster performance for its price, Matrox hoped to win over enthusiasts with the Parhelia's unique and high quality features, such as "Surround Gaming", glyph acceleration, high resolutions, and 16x fragment anti-aliasing. In these aspects, some reviewers suggested that Parhelia could have been a compelling alternative to the comparably priced GeForce 4 Ti 4600 ($399 USD), which was the performance leader but only DirectX 8.1 compliant.

However, within a few months after release, the Parhelia was completely overshadowed by ATI's far faster and fully DirectX 9.0 compliant Radeon 9700. The Radeon 9700 was faster and produced higher quality 3D images, while debuting at the same price point as the Parhelia ($399 USD). Due to their equivalent pricing against faster cards, the Parhelia never got a significant hold in the market. It remains a niche product today while nVidia and ATI control the majority of the discrete graphics chip market.

[edit] Parhelia-LX

After the launch of Parhelia-512, Matrox released Parhelia-LX, which supports only 128-bit memory and has only 2 pixel pipelines. The first video cards using it included Matrox Millennium P650 and Millennium P750.

[edit] Future products

Originally, Matrox planned to produce the 'Parhelia 2' successor, codenamed 'Pitou'.^[3] However, when Parhelia-512 failed to compete in the gaming market, the project was never again mentioned.

Parhelia processors were later upgraded to support AGP 8x, and PCI Express.

In 2006, Matrox re-introduced Surround Gaming with their TripleHead2Go, which utilizing the existing GPU to render 3D graphics, splitting the resulting image over three screens.^[4][5] Certified products include ATI and NVIDIA (and later Intel) processors.

With the introduction of Millennium P690 in 2007, it was die-shrunk to 90 nm, and supports DDR2 memory.^[6] Windows Vista is supported under XP Driver Model.

In 2008-06-25, Matrox announced the release of M-Series video cards.^[7] It has the advertised single-chip quad head support. Unlike previous products, it supports Windows Vista Aero acceleration.

[edit] References

[edit] External links

• Trusted Reviews - Apple 30in Cinema Display & Matrox Parhelia DL256
• Tom's Hardware Preview
• Tom's Hardware Review

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