Celeron 633Mhz + BX6 II problem

[Spectrum]

Hi,

I got a problem here. I use the above hardware but and set the slotket to auto setting but once it boot up, it show only 600Mhz. I know that the latest version of BX6 II bios can support up to only 600Mhz of celeron. So what can I do now ? Thanks !!

Regards,
Spectrum