{mosgoogle}Hardware Secrets takes a look inisde the Radeon X1900 architecture and came up with the secrets to its power. Considering how expensive these video cards are, knowing what's made of would be nice. Here's a taste.

Fetch4 technology allows the GPU to sample simultaneously four values from adjacent areas when dealing with shadow maps, thus increasing texture sampling rate by a factor of four when processing this kind of texture.

Another difference between Radeon X1900 and Radeon X1800 is that X1900 has 50% more on-chip memory for hierarchical Z than X1800, which should improve performance on games played in very high resolutions such as 1920x1200, 2048x1536 and 2560x1600.

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