The Inq reports ATI is working on two new mobile GPUs. The M56 will be the high-end Mobility Radeon X1800 and there's also the faster M58 which will be based on the desktop Radeon X1800 architecture.
This chip features sixteen pipelines and it will be powered with ATI's upcoming Avivo architecture. We learned that the R520 "Fudo" development team has already implemented power saving architecture, so this time ATI was able to make its mobile chip much faster. The chip features 256 Mbit ring memory architecture and supports Shader Model 3.0.
However, we are not sure about heat dissipation, as the desktop R520 gets rather warm, but we are sure that companies such as Dell, Alienware and Voodoo PC are going to embrace this chip for their new notebook designs.