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I wish it’s not part of an April fools joke but it seems that AMD is preparing to release a successor to its flagship model 4870 with a better card, the HD 4890.
ATI Radeon HD 4890 will be slated this April. The new chip will be based on RV790 core and has 850MHz core clock and 900MHz memory clock. This higher clock speed is expected to give the new GPU to perform 25-30% higher than HD 4870 matching the performance given by Geforce GTX 285.
Two editions of HD 4890 is expected to be released this April, the standard edition and the OC edition. Suggested price for this card is US$199 to US$249.