ATI could propose a 16 pixel pipelines VPU instead of the current 12
pipelines this spring to match up with the NVIDIA GeForce 6800. The R420 family
either R423 or R480 comprising of 16 pipes will be produced in small quantity
for the top-of-the-range market. The 16 pipes of R4xx will be available in AGP
8x or PCI-Express x16

ATI could propose a 16 pixel pipelines VPU instead of the current 12
pipelines this spring to match up with the NVIDIA GeForce 6800. The R420 family
either R423 or R480 comprising of 16 pipes will be produced in small quantity
for the top-of-the-range market. The 16 pipes of R4xx will be available in AGP
8x or PCI-Express x16.

R420/423 :

0.13 micron process low-k
160M transistors
~500MHz core clock
~1000Mhz memory clock
256MB GDDR3 or 256MB DDR-I
12/16 pipelines
6 vertex engines
Launch on April 26th