According to the post at Tomshardware.com rumors about RV670 being a Radeon HD 3000 series are correct. Tomshardware even posted a picture and other various Web sites reported specifications about the upcoming Radeon HD 3850 and HD 3870 cards, based on RV670Pro and RV670XT GPUs.
According to the info RV670, or HD 3850 , will end up clocked at 700MHz for the GPU and 1800MHz for memory. It will support DirectX 10.1 and PCI Express 2.0. High performance HD 3870, based on the RV670XT, will end up clocked at 825MHz for the GPU and 2400MHz for the memory. According to the picture, HD 3870 will need a dual slot cooling solution. As with the HD 3850, it supports DirectX 10.1 and PCI-Express 2.0. Both GPUs are made in a 55nm manufacturing process and come with UVD.
Here are the pictures showing the two cards and key features of the HD 3800 series.
RV670 to be renamed HD 3000?