Rage3D have updated their tweak tool again. Here's what they're saying.

Well, it's been quite some time since our last tweaker release, but we have implemented some massive updates to the tweaker. I won't list all the updates here as you'll find many of them on the Rage3D Tweak web page. However, I will say that we've rewritten some of the OC code, added numerous tweaks, vastly updated the custom display and refresh rate interface and support, and flushed all the bugs out of overclocking cards within XP... and that's just a few of the updates. What's new? Enhanced Windows XP support.
Reorganized tweaks listing.
Improved custom display modes and refresh rates support and interface.
Numerous additional tweaks.
New installer and uninstaller.
New support for graphics/skins in the GUI.
Replaced setclk.lib with our own interface to the r6probe files for better compatibility and overclocking support across different cards and platforms.
Split up and renamed tweaker install files for better organization and easier translation.
Many user suggestions, complaints, bugs, etc. fixed.

Download Rage3D Tweak v3.1 for Windows 9x/ME/2K/NT/XP