Chrome S20 series

Chrome S20 Series

Chrome S20 series

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Chrome 20 Series is the successor of S3 Graphics GammaChrome S18.


Chrome 20 series was launched on 2005-11-3, with Chrome S25 and Chrome S27 as the initial products. Both cores use Fujitsu's 90 nm process. Similar to the GammaChrome S18, it is designed for PCI Express, and marketed to low to mid end of the graphics card market, with Chromotion 3 Video Engine and low power consumption as main selling points.

Memory interface supports 32, 64, or 128-bit of GDDR1, GDDR2 or GDDR3 memory. Chrome 20 series can use 32-256MiB GDDR1 or GDDR3 memory at maximum 700 MHz, or 64-512MiB GDDR2 memory at maximum 500 MHz.

Similar to Radeon X1000 series, texturing units and raster operators are separated from pixel shaders. Chrome 20 has 4 vertex shaders, 8 pixel shaders, 4 texturing units, 4 raster operators.

Display output now integrates a single-link TMDS transmitter, with support of dual-link using external transmitters.

Other new features include MultiChrome and AcceleRAM.

Chromotion 3.0

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This revision of Chromotion Engine adds support of nonlinear video scaling, commonly used by wide screen television sets. TV encoder now supports 18 DTV ATSC formats:


<!-- Deleted image removed: -->MultiChrome feature, debuted in Chrome S20 series, allows 2 or more cards to be used together to increase performance, even though configurations of more than 2 cards have not been tested. The methods used by...
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