Nordic Hardware reports AMD is working on a Barts LE-based Radeon HD 6790. This card will offer 800 shader processors, a 840MHz core and 1GB GDDR5 clocked at 4200MHz. It uses two 6-pin power connectors and has a TDP of 150W. Expected launch day is April 5th.
Barts LE uses AMD's classic VLIW5 architecture and will get 10 SM units (Streaming Multiprocessor) with access to a total of 800 stream processors. This can be compared to 12 SM units and 960 stream processors in Radeon HD 6850 that is based on Barts Pro.
Radeon HD 6790 has beside fewer processing units the same bus width at 256-bit and relatively powerful clock frequencies. The GPU operates at 840 MHz while the memory shuffles data at 1050 MHz (4200 MHz effectively). All to put NVIDIA's newcomer GeForce GTX 550 Ti in its place and offer a more powerful alternative to Radeon HD 5770, at a lower price than Radeon HD 6850.