From the M003 manual:
Specifications
Features Intel?s 440BX AGPset with I/ O subsystems.
CPU Support Intel Pentium III 450 MHz~ 600 MHz and faster CPU (at 100 MHz system bus frequency)
Intel Pentium II 233 MHz~ 333 MHz (at 66 MHz system bus frequency)
or Intel Pentium II 350 MHz~ 500 MHz (at 100 MHz system bus frequency)
or Intel Celeron processor 266 MHz and 300 MHz (at 66 MHz system bus frequency)
or Intel Celeron processor 366 MHz~ 500 MHz and faster CPU (at 66 MHz system bus frequency with Socket 370 adapter).