Evidently, the new graphics cards are based on the GeForce FX 5900 SE or the GeForce FX 5900 Value designs provided by NVIDIA or developed by the add-in-board makers themselves. The solution still provides all the architectural advantages of the GeForce FX 5900 GPU and 256-bit memory bus, though, its performance should be slower compared to other products in the family.
Currently there is no information about pricing of the actual graphics cards powered by the new GeForce FX 5900 version, but, I believe that the GeForce FX 5900 SE or Value should not cost more than $300, nevertheless, at this point the A350LX TDH graphics cards from Leadtek cost 380 Euros in France. Note that price and performance of not expensive GeForce FX 5900 products may vary.
I'm not sure what the 'SE' stands for, but maybe Slower Edition is a good guess.
Source : X-bit Labs