The specifications of AMD's Radeon HD 7850 and Radeon HD 7870 were leaked today by Expreview. These cards will fill in the sub-$300 segment of the market, the Radeon HD 7870 will get 2GB GDDR5 while the Radeon HD 7850 will be available in 1GB and 2GB GDDR5 flavors. Additionally, there's also a rumor floating around that AMD may add a Radeon HD 7890 based on the Tahiti core should the need arise.