I don't think it is going to happen for your chip @ reasonable voltages.
My chip will do 4.5 ghz at ~1.30V, probably lower.
But if you insist, I suggest this thread: http://hardforum.com/showthread.php?t=1578110
I wouldn't enable PLL unless you have booting problems, LLC should be set to Very High/Ultra for 5.0 ghz.
Just realize 5.0 ghz is not guaranteed for all 2500K, in fact very few make it that car.
My chip will do 4.5 ghz at ~1.30V, probably lower.
But if you insist, I suggest this thread: http://hardforum.com/showthread.php?t=1578110
I wouldn't enable PLL unless you have booting problems, LLC should be set to Very High/Ultra for 5.0 ghz.
Just realize 5.0 ghz is not guaranteed for all 2500K, in fact very few make it that car.