P6IPA v1.x maximum CPU and HDD supported information as below, HDD:40G Pentium III Tualatin 100 Mhz FSB CPU-No support Pentium III(FCPGA). 100Mhz FSB CPU – 850 MHZ Pentium III(FCPGA). 133Mhz FSB CPU –1G MHZ Celeron 66Mhz(PPGA) FSB CPU –533 MHZ Celeron 66Mhz(FCPGA) FSB CPU –733 MHZ Celeron 100Mhz(FCPGA) FSB CPU –950MHZ VIA C3 100Mhz FSB CPU - 700 MHZ VIA C3 133Mhz FSB CPU - 667 MHZ