I3 540 - what is a good oc with igp enabled?

ragmanchu

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Jan 1, 2011
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have the following rig
i3 540
corsair xms3 2x2GB (1600mhz)
gigabyte GA-H55M-UD2H

i am using the igp and i am looking to oc this cpu past the 4.2ghz mark.
can anyone tell me if its possible to push this chip past the 4.2 barrier with igp enabled?