Re: Trying to get stable OC @ 4.2 Then 4.5
That error code is for a memory management error.
Verify that your DIMM Voltage is at 1.65v. Just because you have it set to 1.65v doesn't mean that's the actual value. It could be 1.63v (an example). Try 1.6v or 1.7v.
Your CPU VTT is at +300mV, what kind of temps are you getting for your Vreg? This value may need to be adjusted.
Try relaxing your memory latencies, maybe, 9-9-9-28-78
Lastly, how are you cooling your system? Not everyone can hit 4.2GHz on air or water, with full stability. Extra steps may need to be taken, as in, lapping both your heatsink and cpu, replacing the stock Northbridge fan with a higher cfm fan, adding a fan to cool off the mosfet/Vreg heatsink (located to the left of the socket, it has no fan).