Overclocking Asus A7v333

[a1rocketpilot]

I've managed to overclock my board and processor (AXP 2200+ T'bred) to 1898 MHz (13x146) before stably and could go beyond possibly, but I want to extract more FSB first, only problem is my lowest multiplier is 13. Is that the lowest one can get on this board? I am running the latest BIOS (1017) and latest drivers, but I'm limited at 13. Does anyone have any experience with this?