FUD Zilla claims AMD will have two RV770 GPUs; the RV770XT and RV770PRO.
We will also remind you that RV770XT supports GDDR5 memory and more importantly it comes with a 512-bit memory bus. With GDDR5 memory that is one of the key cards that ATI plays and GDDR5 will get the memory to much higher speeds than the current 2200MHz and we believe that 2500MHz GDDR5 is a realistic number.
Once you match this with a 512bit memory controller you end up with significantly more bandwidth compared to GDDR4 and GDDR3 chips.
And then there's also the R700 - that's a dual-GPU card with two RV770XT GPUs.