MikeM1100
It seems that there were various graphics options, some were fitted with a Radeon 9000 all in wonder card, others with an Nvidia geforce4 MX420 (Nvidia's lowest performing GF4) but the majority just had Intels 865G "EXTREME" integrated chipset.
All the Addon cards were "low profile" half height but I cannot determine if they were AGP, I suspect they were.
This machine also only has one PCI slot.
All in all you need to physically open the machine to check what you have and if indeed you have the much more desireable AGP 8X slot which will give you much better graphics upgrade potential albeit of the "half height" low profile variety.
Martin
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