hi, i have 3 machines that share common problems:
-3dmark 2001 and newer crashes (3dm01 in point sprites, for example)
-UT99, Unreal gold, and other UE1 games of the era have extremely low fps in D3D mode
-Counter strike source (older build) crashes when starts rendering (at the beginning of a match)
-sometimes, with these problems, the video driver starts to fail, so i have to restart the pc

PC1
Duron Spitfire 950
1GB DDR 266
PCChips M825 (K8M266)
TNT2 Pro 16MB AGP 4x w/ Detonator? 45.23
XP SP3

PC2
Duron Morgan 1.2
1GB DDR 266
PCChips M825 (K8M266)
MX4000 64MB AGP 4x w/ Forceware 93.71
XP SP3

PC3
Athlon XP Thoroughbred 1.6
1GB DDR 333
MSI KM4M (K8M400)
FX5200 128MB AGP x8 w/ Forceware 175.16
XP SP3

I'm very suspicious of driver issues, because the 3 pc works as expected on integrated graphics and with a SiS 315 Pro 32MB AGP 4x installed, even using the same driver on all three machines gave me the same problems: 45.23, 93.71, 81.98, 71.89

also, the 3 video cards works perfect on "similar" intel machines (P4M266, P4VM800, PT800 Ultra)

has someone had those problems? thanks