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The NV2A is the northbridge of the chipset, as well as the GPU.

XGPU (1.0)
XGPU S (1.1-1.4)
XGPU-B (1.6)


The GPU is part of the NV20 family (Kelvin)[1]:

Code name Official Name
NV20 GeForce3 (Ti)
Quadro DCC
NV25 GeForce4 Ti 4200, Ti 4400, Ti 4600
Quadro4 700 XGL, 750 XGL, 900 XGL
NV28 GeForce4 Ti 4200-8X, Ti 4800 (SE), 4200 Go
Quadro4 780 XGL, 980 XGL

Known Revisions

There are 3 known revisions of the Xbox GPU (XGPU), and they are as follows.

XGPU - Found on boards of revision 1.0
XGPU S - Found on boards of revision 1.1-1.4
XGPU-B - Found on boards of revision 1.6

There is very little known about the difference between the revisions, or why there had to be consecutive revisions.
It is unknown if they are pin compatible with each other.