S3 Savage3D's should work fine, but for Savage4, use XFree86 version 4.0.3 or greater (in case of image problems, try 16bpp). As for S3 Virge.. sell it.
-NOTE: Savage4 has a slow YV12 image displaying capability (it -needs to do all kind of conversions, possibly a driver issue). So when -this documentation says at some point "this has YV12 output use this, it's -faster", you shouldn't. Stick to YUY2.
+NOTE: Savage4 has a slow YV12 image displaying capability (it needs +to do YV12->YUY2 conversion, because the Savage hardware can't display YV12). +So when this documentation says at some point "this has YV12 output use this, +it's faster", you shouldn't. Stick to YUY2.