The number of stream processors, the new answer to pixel and vertex shaders, holds steady at 320 with 16 texture units and 16 render backends. As you might expect with a die shrink the core speed has also increased by 35MHz to 775MHz though you will see some overclocked parts out there this HD 3870 we're reviewing is at stock clocks. Memory speeds see a much larger bump up to 2.25GHz effective over 1.65GHz of the 2900 XT.

One new feature which it also boasts over the R600 is support for PCI-Express 2.0 which is now featured in AMD's 790FX chipset and will be in Nvidia's new 700 series chipsets as well as Intel's newer chipsets. No major benefits from it yet so you'll be fine with PCI-E 1.0 but it's good to see a new spec for the very successful PCI-E.



Link: AMDZone