Why don't you head over here: http://community.sierra.com/[email protected]^[email protected]

That's the Tribes 2 Troubleshooting forum, and they're pretty helpful. I haven't had any trouble in Tribes 2 yet with my setup and I'm running in 1024x768x16 with all the settings maxed out.

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Abit KT7A
Thunderbird 1ghz 266FSB
Crucial 128mb PC133 CL2
Voodoo 3 2000 AGP
SB Live! Value