This is what I would base my decision on. Because many or most games of that time used glide instead of direct garbageTM. Even the old unreal used glide and only got at a very later time full direct garbageTM support (patch 226i I belive).
Here some very neat info on the 6326 dunno if you already knew that:
http://vintage3d.org/sis.php#sthash.BK6E8YOa.dpbs
And here a perfect Database of games I would play on that old hardware:
http://vintage3d.org/images/sis/gallery.php#nogo
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