HD problems in Xbox 360 and PS3
Zenji Nishikawa has uploaded the latest issue of his article series about 3D game technologies. The subject of this article is the concern about sub-HD rendering in the next-gen consoles. It also contains anonymous developers’ quotes, all of which has been translated by One.
* The RAM bandwidth of Xbox 360 GPU is almost equal to RADEON X1600 XT and shared with CPU by UMA.
* Without the eDRAM pixel processor doing 4xMSAA, the fillrate of the GPU core itself is 4 billion texel/sec and almost equal to GeForce 7600 GT.
* While the Xbox 360 has a 3.5 times broader bandwidth than the original Xbox, 720p pixels require a 3 times broader memory bandwidth. It leaves only 0.5 times headroom which is insufficient for multiple texture lookups by complex shaders.
