[carl33p]

Quote:

Global OpenGL issues
--------------------

There are some visual artifacts that will occur as a result of the way
TRIBES handles the depth coordinate. We are working to resolve these.
They will be especially visible if you are running on a Riva128. They
do not affect performance or gameplay in any way, but they're annoying.

While the OpenGL performance has been greatly improved, there are still
some occasional pauses that occur. You may notice these when viewing
the terrain for the first time on certain levels.

Switching from fullscreen Glide/Software mode to fullscreen OpenGL on some cards
will crash TRIBES. You can work around this by switching to windowed software
mode before entering OpenGL mode.

If you are running in OpenGL and occasionally TRIBES crashes you can often
alleviate this by changing your virtual memory settings to 200 megs minimum and
maximum. This can be accessed by going to your control panel and selecting system.
You will find it on the performance tab. Note: changing your virtual memory settings
is not recommended for novice users.

Well the problem is not your Gfx card. Cause if your running Oblivion and not getting artifacts, then you should be able to run any game. Hopefully the Tribes forum has an answer for you. You could try messing around with different settings.