AMD is releasing a new salvo of mainstream graphics cards that should fall in the sub-$80 price segment, dubbed the Radeon HD 4670. The GPU at the heart of the 4670 is based on the RV770 architecture used on the Radeon HD 4800 series, sans a few stream processors, ROPs, and other assorted elements, but with what is essentially the same feature set as its more expensive counterparts. As powerful and exciting as the ATI Radeon HD 4870 X2 or GeForce GTX 280 cards may be, AMD and NVIDIA simply don't sell as many flagship products as they do mainstream cards.