CPTune4

CPTune4 is a powerful overclocking and benchmarking utility for CASIO ClassPad II calculators running Hollyhock.

Features

• Real-time frequency monitoring — view CPU, PLL, SFO, BFC, and PFC frequencies live
• FLL multiplier tuning — overclock up to ×2047 (and full-range for both SELXM 1 and 1/2) (use with caution!)
• Memory tester — verify RAM and ROM integrity with RAM Only, ROM & RAM, or skip
• Dhrystone benchmark — measure raw CPU performance in iterations per second
• FPS counter — see your display refresh rate in real time

Usage

Launch from the Hollyhock app menu. Use arrow keys to navigate and adjust frequency multipliers. Press [7] to capture current values, [8] for help.

⚠ Overclocking beyond stable limits may cause the calculator to freeze. A battery pull safely resets it.

Compatibility

Tested on ClassPad II (fx-CP400+E) with Hollyhock firmware. Not compatible with non-Hollyhock devices.