I reach 220 Mhz BCLK and I can't seem to go higher

multiplier: 12x
bclk: 220
CPU Vcore: 1.20625v
QPI/Dram (VTT): 1.24375
DRAM Bus: 1.537v
PLL: 1.82 v
IOH 1.29v

I can't go higher than 220Mhz BCLK, what should I do to go higher?, my memory is currently at its lowest. I have G Skill 2000 Mhz