In comparison to the Radeon HD 5770, the Radeon HD 6790 gives similar processing power (-1%) but with memory bandwidth up by 75%.
Note that AMD gives an “up to” clock for the GPU and memory on this Radeon HD 6790 but haven’t been able to tell us exactly what they mean by this, though of course this does lead you to think that there may well be more than the odd underclocked Radeon HD 6790 in stores after launch…
The reference Radeon HD 6790
For this test, AMD supplied us with a reference Radeon HD 6790:
This Radeon HD 6790 is, apart from the sticker on its cooler, in every way identical to the reference Radeon HD 6870. This means the card requires two 6-pin power connectors and measures 25cm. You can find more details in the Radeon HD 6870 test
With respect to overclocking, we managed to take our test GPU from 840 to 950 MHz, a gain of 13%.
We should say that AMD wasn’t able to confirm whether this reference design would be available in stores or not as it looks as if most partners will be bringing out a customised model, derived from their own Radeon HD 6870s.