I have Procomp BVD2A mainboard, bios 2.00 vertion.
With Celeron 433 it works perfectly.
When I install P III 667/256/133/1.65V I get such behaviour:
1. First booting.
AGP card activates.
Message: BIOS ROM checksum error,

and floppy seek from boot block.
When I put celeron back the board works, but defaults of bios are set (the date and clock stayes untouched).
2. Second booting (without hardware change, only power turn-off and on).
The most offen the board beeps that there is no RAM. I use dimm with 6ns timing, so it should work at 133 MHz.
Once the board beeped out something else (I don't know what).
Bios defaults loaded.
What is wrong?
This happens in auto frequency mode and jumpers set to FSB133, too.
The voltage is auto in this board.
Please, help
Zorro