rda8+ no overclocking

I've got the 8RDA+ and an AMD 2100+ Athlon. I have tried to OC it gradually. I can run it witht he FSB set to 134Mhz, but when I hit 135Mhz it won't boot up and gives me like a siren sound. I then have to clear the CMOS via jumpers and reset the FSB jumper. Does anyone know why I can't for teh life of me go past 134Mhz. I have the latest BIOS update etc..

Thanks..

Check the LED inside and see what error code you are getting when the siren goes off.

What is your ram speed?

Ramspeed pc2100 at the moment, waiting for pc3200 could not resist to give it a try with this ram
reinserted dimms no more sirens