German website Hardware-Infos claims that AMD will release its upcoming Radeon HD 4000 series in May next month. While the information is nothing more than speculative at this stage, it does make sense.
Why? Well, Computex Taipei starts in early June and it would make sense for AMD to have a bunch of fresh new graphics cards on display at the big show. If it does turn out to be a May launch, it would probably be right at the end of the month we'd hesitate to guess.
Nevertheless, Hardware-Infos has a bunch of details (albeit in German) discussing the specifications of the HD 4870, HD 4850 and HD 4850 GDDR3. They are all based on a 55nm die manufacturing process, two out of three use GDDR5 memory, HD 4870 has a TDP of 150 watts while the other two are less power hungry at 110 watts. HD 4870 will get 1GB of onboard RAM (oh baby don't stop - HD 4870 X2 would likely have 2GB onboard in that case!) while the 4850 sees the now regular 512MB and the GDDR3 version will get either 512MB or 256MB depending on AIB partner decision making.
We had some troubles translating this page with Google, so head on over if you can read the German language.