I remember former discussions because of issues with the Celerons II and core voltages over 1.6 Volts or so. I run a Celeron 533 and the system won't work at voltages over 1.6 V (I tried this at the time when trying to overclock the cpu nd recently again with a recent bios) At the moment I think of upgrading to a Celeron 800 (100MHz FSB), but I wonder if the CUBX will run that CPU as it needs 1.7 V...