Here are some parts of the final specifications of the upcoming Radeon HD 5870 (DX11 graphics card): 1600 scalar processors, core clock of 850MHz, 1GB of graphics memory and the board will have a thermal power design (or TDP) of 188 Watts. Keep in mind that Radeon HD 4870 has a TDP of 157W and Radeon HD 4890 has a TDP of 190W. As claimed in this news, AMD seems to have improved the power consumption side of the Radeon HD 5000 series.
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seeing how power hungry is the new nvidia 480, this gpu looks great, would be greater if ATI lower this pricey gpu.