As one would have expected it, while the Radeon HD 4870 just became available for Mac users as the high-end graphic card of the new Mac Pro, the future flagship of AMD/ATI will be the Radeon HD 4890, and it should be available in shops very soon. Some shops already have the price of this future graphic card which will be cheaper than the Mac HD 4870... around 260 €. It will sport a GPU clocked at 800 MHz (instead of 750 for the Radeon HD 4870), the 1 GB of VRAM will be clocked at 975 MHz instead of 900 MHz for PC Radeon HD 4870 et 850 MHz for the Mac Edition.
The GPU will not be identical between both cards, so one can not predict if one can flash the forthcoming Radeon HD 4890 with the MAc ROM HD 4870, but we will try it as soon as the new AMD/ATI flagship becomes available in shops
