Hot Hardware saw the R680 Radeon HD 3870 X2 graphics card at CES 2008. They published two photos of the card alone and one pic of the card installed into a system.
We can't disclose any specifications just yet, but can say that the 3870 X2 has a pair of R670 GPUs on single PCB coupled together via a PCI Express fanout switch from PLX. Frame Buffer memory configurations are likely to be similar to existing Radeon HD 3870 cards - per GPU - but representatives from ATI informed us that board parters are likely to design cards with up to 2GB frame buffers. As for power and performance, once again, we can't give specifics for now. However, think less power than a 2900 XT with performance on par or better than a Radeon HD 3870 CrossFire configuration.