Asian hardware site Expreview published yet another exclusive, they have the specifications of ATI's upcoming RV775Pro and RV775XT graphics cards.
The site received the details about these GPUs from an anonymous source, who claims the RV775XT will be launched next month while the RV775Pro is slated for March 2009. Just like the current Radeon HD 4800 series these chips are made on a 55nm process, and the source claims ATI increased the shader processors from 800 to 840, while increasing the texture units (TMU) from 40 to 48.
The specifications indicate ATI managed to cut the transistor count from 956 million on the RV770 to 927 million on the upcoming RV775 GPUs, resulting in a die size of 246mm², compared to 260mm² on the Radeon HD 4800 cards. Both cards feature a 256-bit memory bus and 512MB of memory, the RV775XT will have GDDR5 chips while the RV775Pro might be using GDDR4.
The main difference between the GPUs lies in the clockspeeds. The RV775XT will have a 9000MHz core and 4000MHz GDDR5 memory, while the RV775Pro may have 2800MHz GDDR4 memory.
Apparently, RV775XT is designed to fight GeForce GTX285 and put NVIDIA into a difficult situation. The informer doesn’t mention 1GB version, but it won’t be a big problem to add another 512MB GDDR5. (it rumors that AMD has ordered all GDDR5 chips that a memory manufacturer produces in Q1 and Q2 next year). Probably RV775XT will be branded as Radeon HD5870. Real products are expected to be available late January, just after the new version of GTX200 Series.