From X-Bit Labs
http://www.xbitlabs.com/news/video/display/20040408100025.html
"Sources familiar with the company¡¦s roadmap revealed Thursday, the 8th of April, that the 420/R423 graphics processors will have 16 rendering pipelines, significantly more compared to the previously released information about 8 or 12 pipes. Apparently, the company¡¦s future chips have the same capability of enabling and disabling pixel pipelines like the predecessors ¡V the R300 and R350/R360 chips ¡V which were capable of working either with 4 or 8 rendering pipelines. Initially the company believed that 8 pixel conveyers would be enough to stay competitive against the rivaling NVIDIA NV40 chip, however, at this point ATI wants to expose all capabilities of the RADEON X800-series chips to fight with the competitor."
With more effective shaders avaliable, I think R420 will hammer NV40.
http://www.xbitlabs.com/news/video/display/20040408100025.html
"Sources familiar with the company¡¦s roadmap revealed Thursday, the 8th of April, that the 420/R423 graphics processors will have 16 rendering pipelines, significantly more compared to the previously released information about 8 or 12 pipes. Apparently, the company¡¦s future chips have the same capability of enabling and disabling pixel pipelines like the predecessors ¡V the R300 and R350/R360 chips ¡V which were capable of working either with 4 or 8 rendering pipelines. Initially the company believed that 8 pixel conveyers would be enough to stay competitive against the rivaling NVIDIA NV40 chip, however, at this point ATI wants to expose all capabilities of the RADEON X800-series chips to fight with the competitor."
With more effective shaders avaliable, I think R420 will hammer NV40.