Oveclockin with 6btm

[Seven]

I have a very old bx board 6BTM and overclocked Celly533@800. It works just fine
,and i dont wont to change my mobo just now.
The problem is that I can use only 66 and 100 FSB. Jumper on the board can be set at CPUselect, 66,100.I have SeePu in my BIOS but what ever I
set for FSB (it goes from 66 to 133) i get 66 FSB with jumper on CPUselect, and 100 FSB with jumper selected like that.
I have upgraded my bios and it is still the same. How can I get more freq.
for FSB. When I had PII300 I could overclock it only at 450 and it was also good. but I would like some more FSB freq. enabled for testing.
Please HELP!!!!!!!

[got_yogurt]

Have u tried soft FSB?

[Vinetu]

I have also CT-6BTM and a C 433. I o/c to 541Mhz and it seems that works fine (exept that crashes sometimes in games). I've heard the the C 433@541 works stable in 2.4 Vcore.Is it truth. And can I get 100 FSB from my CPU. I read that the maximum FSb for Celeron 433 is 92 MHz x6.5 (598 MHz) and 2,3V/2,2V to work stable. But for 6BTM 92 FSB is not allowed. Also I use a Slotket.
It's nice and have lots of jumpers for overclocking. Give me the right solution to take. Thank YOU!!!