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Evo N180 - Video Tech Specs

Video Tech Specs
ATI Mobility Radeon with 64-bit video graphics, video memory expandable from 8 to 32 MB, 4X AGP graphics card
Features
Mobility RADEON
Core clock
Up to 200 MHz
Rendering Pipeline
1
Texturing Units Per Pipeline
3
Maximal Possible Pixel Fill Rate (highly depending on core clock)
200 Mpixel/s
Maximal Possible Texel Fill Rate (highly depending on core clock)
600 Mtexel/s
Integrated T&L Unit
no
Video Memory
8/16 MB internal DDR SDRAM, up to 32 MB external SDR/DDR SDRAM
Width Of Internal Memory Interface
128-bit
Width Of External Memory Interface
32/64-bit
Memory Types Supported
SDR-SDRAM / DDR-SDRAM
Maximal Possible Memory Bandwidth
6.4 GB/s internal / 3.2 GB/s external
Memory clock
Up to 200MHz
MPEG2/DVD Decoding Acceleration
Integrated iDCT , Motion Compensation
NOTE: Information Source
All of the above information is from product documentation provide on /">Tom's Hardware Guide , ATI's Website and other search engines on the internet. Some of the features in this article may not be implemented by Compaq.
NOTE:  iDCT
  • The first step of the JPEG compression algorithm groups the image into multiple 8x8 (64) pixels. 
  • Each 8x8 block is regarded as a 64-point discrete signal, and encoded using a method similar to the Fast Fourier Transform, converting the unsigned values to signed numbers, called coefficients. 
  • These numbers can now be reordered to facilitate compression 
  • Basically, the numbers represent the intensity of each pixel - chrominance, luminence and color. 
  • The arithmetic is messy and can be found in a CACM April 1991 article by Gregory Wallace: The JPEG Still Compression Standard. 
  • The encoding step is called the Forward Discrete Cosine Transform . FDCT. 
  • The method has a unique inverse function - an Inverse DCT (IDCT) - which decodes the stored image back to the 8x8 blocks to reconstruct the stored image.

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