The X1900 is going to chew more power than the X1800 as it uses the same process yet has more material, approaching over 175W of power, making it the most greedy thing you will have in a box. It is available in 512MB varieties already, something that is gaining popularity. Hardwarezone has a brief overlook of the card. As benchmarks become available, we'll get to see just how important pixel shader processors really are and see if the difference is worth it.
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