I believe the accelerated driver for Savage cards is "savage".
Yeah, here's a bit from the xfree86 site:
Support (accelerated) for the Savage3D, Savage3D/MV, Savage4, Savage2000, and SuperSavage, is provided by the "savage" driver.
That's from the video driver support page for version 4.2.0 of XFree86. Here's the link:
Ideally, whatever autoconfig ran when you setup your OS would have detected the hardware and selected the correct driver. You can look in the /etc/X11/XF86Config file to see which driver is currently being used.