Ati R520 Agp?
 

We don't know many details about it yet, but we are almost certain that ATI plans to bridge the R520 chip with its Rialto bridge chip. It did it before with R480, R430 and RV410 as it just announced those chips bridged back to AGP using Rialto bridge.

http://www.theinquirer.net/?article=21699