Sapphire presents one of the first Radeon HD 4890 based on AMD/ATIs new and overworked RV790 chip. It comes with 100 MHz more clock speed on the GPU and 150 MHz more clock speed on the cards memory.
AMD/ATIs new and overworked RV790 chip comes now with 850 MHz GPU clock and 1950 MHz effective memory clock. Especially with these changes and a further improved board design AMD/ATI tries to show nVidia the way to go.
On the following pages you'll be able to read what the Sapphire Radeon HD 4890 with 1024 MB memory is capable of. To the comments