Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 59

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chapter
Your computer offers one of three levels of graphics support,
depending on the model:
Enhanced 64-Bit Graphics with 3D Acceleration,
provided by the S3 ViRGE/GX graphics controller
Matrox Performance Graphics, provided by the Matrox
MGA 1064-SG graphics controller
Matrox Millennium-II AGP Graphics
These controllers are high-performance PCI or AGP graphics
controllers, offering 3D graphics support. The quality of the
picture you see depends on the resolution capabilities of your
monitor and the number of colors that the graphics controller
can display.
The S3 Enhanced 64-bit and Matrox Performance graphics
controllers come standard with 2 megabytes of SGRAM and
are upgradable to 4 megabytes of SGRAM.
The Matrox Millennium-II AGP graphics controller comes
standard with 4 megabytes of WRAM and is upgradable to
16 megabytes of WRAM.