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Product : X850XT IceQII Turbo VIVO AGP and X850XT Platinum Edition IceQII VIVO AGP
Company : HIS
Author : Mark 'Ratchet' Thorne
Date : May 9th, 2005

Technical Specs

The R481 core is built using about 160 million transistors on TSMC's 130nm low-k silicon process. It has 16 rendering pipeline with 6 vertex shader units and a 256bit memory bus. It supports all the same features as the other R4x0 cards including full DX9.0b support, OpenGL 2.0, and ATI's own 3Dc. Right now the R481 core can only be found on the two AGP versions of the X850XT graphics card I'm looking at in this review, the X850XT Platinum Edition and the X850XT.

Both the X850XT Platinum and the X850XT are physically identical (save for a sticker on the back telling you which is which). The only differences between the two are the core and memory speeds. The X850XT-PE has a 540MHz core clock and 590MHz memory (1,180MHz effective) while the X850XT has a 520MHz core clock and 540MHz memory (1,080MHz effective). Both cards use the same Samsung GDDR3 memory modules rated for 1.6ns (625MHz).

The chart below contains the full specs of both cards along with the specs of the other cards I'll be using in this review.

  HIS X850XT IceQII Platinum HIS X850XT IceQII Turbo Radeon X800XT Platinum Radeon X800XT Radeon X800 Pro
Core R481 R481 R420 R420 R420
Silicon Process 130nm low-k 130nm low-k 130nm low-k 130nm low-k 130nm low-k
Transistor Count
160 160 160 160 160
Core Speed MHz 540 520
(540 Turbo)
520 500 450
Memory Speed MHz 590 GDDR3 540 GDDR3
(590 Turbo)
560 GDDR3 500 GDDR3 475 GDDR3
Bus Standard AGP 8x AGP 8x AGP 8x AGP 8x AGP 8x
Bus Width 256bit 256bit 256bit 256bit 256bit
Pixel Pipelines 16 16 16 16 12
Peak Memory Bandwidth
37.76 34.56
(37.76 Turbo)
35.84 32.00 30.40
Pixel Fillrate
(million pixels/sec)
8,640 8,320
(8,640 Turbo)
8,320 8,000 5,400
Texel Fillrate
(million texels/sec)
8,640 8,320
(8,640 Turbo)
8,320 8,000 5,400
MSRP ($US) $549 $449 $499 - $399

Both of the X850XTs support the following features:

  • Support for Microsoft® DirectX® 9.0 programmable vertex and pixel shaders in hardware
  • DirectX 9.0 Vertex Shaders
    • Vertex programs up to 65,280 instructions with flow control
    • Single cycle trigonometric operations (SIN & COS)
  • Direct X 9.0 Extended Pixel Shaders
    • Up to 1,536 instructions and 16 textures per rendering pass
    • 2nd generation F-buffer technology accelerates multi-pass pixel shader programs with unlimited instructions
    • 32 temporary and constant registers
    • Facing register for two-sided lighting
    • 128-bit, 64-bit & 32-bit per pixel floating point color formats
    • Multiple Render Target (MRT) support
  • Complete feature set also supported in OpenGL® via extensions
  • 2x/4x/6x Anti-Aliasing modes
    • Sparse multi-sample algorithm with gamma correction, programmable sample patterns, and centroid sampling
    • Lossless Color Compression (up to 6:1)at all resolutions, including widescreen HDTV resolutions
    • Temporal Anti-Aliasing
  • 2x/4x/8x/16x Anisotropic Filtering modes
    • Up to 128-tap texture filtering
    • Adaptive algorithm with bilinear (performance) and trilinear (quality) options
  • High quality 4:1 Normal Map Compression
  • Works with any two-channel data format
  • 3-level Hierarchical Z-Buffer with Early Z Test
  • Lossless Z-Buffer Compression (up to 48:1)
  • Fast Z-Buffer Clear
  • Z Cache optimized for real-time shadow rendering
  • Optimized for performance at high display resolutions, including widescreen HDTV resolutions
  • Seamless integration of pixel shaders with video in real time
  • FULLSTREAM™ video de-blocking technology for Real, DivX, and WMV9 formats
  • VIDEOSOAP™ noise removal filtering for captured video
  • MPEG1/2/4 decode and encode acceleration
    • DXVA Support
    • Hardware Motion Compensation, iDCT, DCT and color space conversion
  • All-format DTV/HDTV decoding
  • YPrPb component output for direct drive of HDTV displays
  • Adaptive Per-Pixel De-Interlacing and Frame Rate Conversion (temporal filtering)
Display Features
  • Dual integrated display controllers
  • Dual integrated 10 bit per channel 400 MHz DACs Integrated
  • 165 MHz TMDS transmitter (DVI 1.0 / HDMI compliant and HDCP ready)
  • Integrated TV Output support up to 1024x768 resolution

R480 Graphics Core
R480 Graphics Core
Samsung 1.6ns GGDR3 Memory Modules
Samsung 1.6ns GGDR3 Memory Modules

X850XT IceQII Platinum Edition
X850XT IceQII Platinum Edition
X850XT IceQII Platinum Edition
X850XT IceQII Platinum Edition

X850XT IceQII Turbo
X850XT IceQII Turbo
X850XT IceQII Turbo
X850XT IceQII Turbo

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