Word out there is that AMD will introduce a Radeon HD 2900 XT card with 1GB of GDDR4 memory tomorrow, but there's little talk of its specifications. However, TR reader Ustauk has sent us a link to a Canadian online retailer that already has a listing for a Diamond Radeon HD 2900 XT 1GB, complete with pricing and specs.
The 1GB card's GDDR4 memory is apparently clocked at either 1100MHz or 1050MHz (the listing is contradictory), so peak memory bandwidth should add up to either 140.8GB/s or 134.4GB/s. That's an increase of 27.3% to 33% from the 512MB model, whose memory runs at 825MHz and yields peak bandwidth of 105.6GB/s. Core clock speed has also gone up from 740MHz on the 512MB card to 825MHz on the 1GB model, raising peak floating point power 11% from 475 GFLOPS to 528 GFLOPS.
As for pricing, the 1GB card is listed for $649.99 CAD. The same site sells Diamond's Radeon HD 2900 XT 512MB for $464.95 CAD, suggesting that the 1GB model has a 40% price premium. Diamond's 2900 XT 512MB costs $419.99 on Newegg, so applying the same premium there would result in a $587.99 USD price tag for the 1GB card.
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