ur OCing quad core .
y not reduce d multiplier until like 4-5 ?
and put d vCore to stock vID and push FSB bit by bit .
im saying like 333x7 = 2331
400x6 = 2400

u get wat i mean ?
keep d speed at almost identical as stock and find d stable spot for it .

raising speed u can add multiplier and vCore only so wont be hard .