Because it's almost 2027, we need a new overclocking tool for the Rage 128 / 128 Pro. So after some weeks of testing here is the first public version of Road Rage 128.

The Readme content is below, but my goals were:
- Single portable exe file
- Compatible with Windows 98 SE and Windows 2000
- A tool to automatically find the maximum core and memory frequency a card supports without glitching
- Hide to tray option
- Card BIOS dump option (only shows up on Windows 2000, not possible on 98)
- Log of the changes, goes back to stock speeds if the PC crashed
- Display the card's information and users driver in the info box
- Configure clock speeds beyond the card's usual max frequency (can be unstable)

So, it looks like this. Basic usage is to launch it, click "Find max clocks" and apply at the end.

When the little integrated benchmark has run, it suggest what to apply:

Any feedback or test on a Rage 128 I don't have is welcome!

The complete Readme:

Road Rage 128 - version 0.9.3 ============================= […]
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Road Rage 128 - version 0.9.3
=============================

Overclocking tool for ATI Rage 128 and Rage 128 Pro graphics cards under
Windows 98 SE and Windows 2000. One program file, nothing to install.

- "Find max clocks" searches the highest error-free clocks for core and
memory by itself and offers safe clocks a little below them
- "Dump BIOS" (Windows 2000) saves a flashable copy of the card's BIOS
- Exit returns to the factory clocks, and so does every reboot: nothing
on the card or in Windows is changed for good

REQUIREMENTS
------------
- Windows 98 SE, or Windows 2000 logged on as an Administrator
- ATI display driver and DirectX 7 or later (for the 3D test)
- Rage 128 or Rage 128 Pro chip. The Rage Fury MAXX (two chips) and
the Rage Mobility (laptop) chips are not supported: Road Rage 128
shows them but leaves their clocks alone.

GUI
---
Card what was detected
Clocks Core and Memory sliders and the buttons:
Apply and test sets the slider clocks and tests them (a few
seconds); if the test fails, the previous
clocks come back
Factory defaults back to the factory clocks
Find max clocks automatic search, about 4-6 minutes: a short
test at every 1 MHz step, then 25 s of
continuous load to confirm the maximum of
each clock; then it offers clocks 3 % below
the maximum and checks them for 1 minute
before keeping them (if that fails: 5, 7,
then 9 % below). The sliders follow it;
Stop ends it
Dump BIOS Windows 2000 only: saves a flashable copy of
the BIOS chip (read twice and checked)
Options Allow clocks beyond the clock generator's rating (up to 11 %
more): The card's clock generator is specified by ATI for a
range stored in the BIOS. On some cards that range ends below
what the chip or the memory can do; this option lets core and
memory run up to 11 % above it. Every setting is still tested.

Road Rage 128 changes nothing when it starts: the sliders open at the last
clocks that passed "Apply and test"; click "Apply and test" to use them.

Overclocking only lasts while Road Rage 128 runs:
Hide to tray Road Rage 128 keeps running (tray icon), clocks stay applied
Exit back to the factory clocks, then Road Rage 128 quits

Every action is written to the window's log and to GUI_n.TXT. The settings
are kept in ROADRAGE.INI.

GOOD TO KNOW
------------
- Every card is different: as they warm up a clock that passes when
cold can fail after some minutes, which is why "Find max clocks" ends
with a 1-minute check and a margin below the maximum.
- Windows 2000: Road Rage 128 brings a small driver for the hardware
access. It is unpacked to the TEMP folder and loaded when the program
starts, and removed again when it quits. Nothing stays installed.

TESTED ON
---------
ATI Xpert 128 (Rage 128 GL, PCI ID 1002:5246), 32 MB SDR, 64-bit bus
Windows 98 SE, ATI driver 4.12.6292 ("Magnum/Xpert128/X99/
Xpert2000"), DirectX 8.1
factory core 79.8 / memory 119.7 MHz; found up to about 127 / 144 MHz

ATI Rage 128 Pro II GL (PCI ID 1002:5446), 32 MB SDR, 128-bit bus
Windows 98 SE, same driver and DirectX
Windows 2000 SP4, ATI driver 5.13.1.3279, DirectX 9.0c
factory core 133.3 / memory 133.3 MHz; found up to about 161-169 /
155 MHz

COMMAND LINE
------------
ROADRAGE /probe hardware report (PROBE_n.TXT): please post it
when you ask for help or report a card