problem with motherboard

I have (CHAINTECH 7KJD0 FSB266 AMD 761 socket A 3xDDR 4xAGP, UDMA100, 5PCI, CNR, ACR, Sound 6 channel PC Theatre with AMD 1,2 GHz, 256 Mb DDR and Leatech GeForce 2 mx400 Max 64 Mb) this not working @ 133mhz jumper selection onli working @ 100mhz