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HIS Excalibur X800 PRO IceQ II (256MB)
By Vijay Anand
Category : Graphics
Published by Jimmy Tang on Sunday, 15th August, 2004
Rating : 4.5 out of 5 stars  


Flavors Of The RADEON X800 Series

On the RADEON X800 series alone, there are a total of three variations at the time of writing – X800 PRO, X800 XT and X800 XT Platinum Edition. Although all three would utilize the same VPU and have different operating speeds to differentiate them, the PRO variant would only have 12 pipelines enabled as opposed to the latter versions that have 16 full pipelines. So how is it that the PRO still uses the same core?

One thing you have to note is that the yield for these ultra complex graphics chips is never 100%, which means to say that some of them would have slightly inferior performance, but this is common in all wafer production and it's just a matter of what percentage actually meets the criteria of the chip's intended specifications. Like the former RADEON products, the X800 graphics core is designed in a modular fashion (we won't be going into detail in this article) and this time it is made up of four working units or quads as they are termed in graphics terminology. So a complement of four working quads on the RADEON X800 enables the full 16 rendering pipelines. Those that have less than perfect yield (with some defects) and only affects one of these quads, ATI can isolate it, leaving only three working quads for a total of 12 rendering pipelines. This is how ATI derived the RADEON X800 PRO part from the same R420 core. This certainly reduces chip wastage and useful VPUs can be pushed out to generate more revenue.

Although we wish to explain the new advancements or enhancements of the new VPU, we'll save that for another ATI article. Below is a table comparing the previous king with that of the latest X800 series and that should summarize a lot of what we wish to convey. Do note that the RADEON X800 XT is also available in the PCI Express flavor but don't expect this to be available anytime soon.

VPU Core Comparison
GPU/VPU ATI RADEON X800 XT Platinum Edition ATI RADEON X800 XT ATI RADEON X800 PRO ATI RADEON 9800 XT
Core Code R420 R420 R420 R360
Manufacturing Process (microns) 0.13 0.13 0.13 0.15
Core Clock 520MHz 500MHz 475MHz 412MHz
Rendering (Pixel) Pipelines 16 16 12 8
Pixel Fill Rate (MPixels/s) 8,320 8,000 5,700 3,296
Texture Units per Pipeline 1 1 1 1
Peak Texture Fill Rate (Mtexels/s) 8,320 8,000 5,700 3,296
Vertex Shaders 6 6 6 4
Memory Clock 560MHz (1120MHz DDR3) 500MHz (1000MHz DDR3) 450MHz (900MHz DDR3) 365MHz (730MHz DDR)
DDR Memory Bus 256-bit 256-bit 256-bit 256-bit
Memory Bandwidth 35.8GB/s 32.0GB/s 28.8GB/s 23.4GB/s
ATI SMARTSHADER HD HD HD 2.1
ATI SMOOTHVISION HD HD HD 2.1
ATI HYPER Z HD HD HD III+
Pixel Shader Support 2.0+ 2.0+ 2.0+ 2.0
Vertex Shader Support 2.0+ 2.0+ 2.0+ 2.0
DirectX Support Up to DirectX 9.0 Up to DirectX 9.0 Up to DirectX 9.0 Up to DirectX 9.0
FSAA Mode Multi Sampling (up to 6x) Multi Sampling (up to 6x) Multi Sampling (up to 6x) Multi Sampling (Up to 6x)
Anisotropic filtering Modes Up to 16x Up to 16x Up to 16x Up to 16x
Other Features
  • VIDEOSHADER HD
  • 3Dc
  • HYDRA VISION
  • VIDEOSHADER HD
  • 3Dc
  • HYDRA VISION
  • VIDEOSHADER HD
  • 3Dc
  • HYDRA VISION
  • VIDEOSHADER
  • TRUEFORM 2.0
  • HYDRA VISION
  • RAMDAC Dual 400MHz Dual 400MHz Dual 400MHz Dual 400MHz
    TV Output Int., 1024x768 Int., 1024x768 Int., 1024x768 Int., 1024x768
    TMDS transmitter Int. 165MHz Int. 165MHz Int. 165MHz Int. 165MHz
    AGP speed 8x 8x 8x 8x
    AGP bus Compatibility AGP 3.0 and 2.0 AGP 3.0 and 2.0 AGP 3.0 and 2.0 AGP 3.0 and 2.0

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