Actually, the 360 does have a custom architecture. It has a tri-core PPC based C...

dogshoes on Jan 8, 2013 | parent | context | favorite | on: Valve And Xi3 Team For ‘Piston’ Steam Box

Actually, the 360 does have a custom architecture. It has a tri-core PPC based CPU and all custom ICs for the GPU and southbridge. It was the original Xbox which was Pentium based and very close to a commercial PC, although with custom GPU and southbridge ICs as well.