at 12.5, your not going to get much more fsb out of that. I'd try a 11x and then up the fsb to somewhere around 220-225 and check stability there. If it's stable, up it to 235-240 and then check stability. If it's stable there, go to 11.5x and see if you can keep you cpu stable, although at 240*11.5, you'll need a lot of vcore. 236*11.5 at 1.9V would be realistic I guess if you have a good chip. You might need more vcore though. Before you do any of this though, make sure you have adequate cooling before going over 1.8V. You'll need a nice Thermalright or WC past that mark.