how well will i be able to overclock with 790GX? Please help me

[AcesTranquility]

Hi,

I am thinking about getting a mother board with the 790GX chipset.

I plan to overclock my Phenom II X4 955 to 4.2ghz... will the 790GX chipsets allow me to overclock that far? or will i need a 790FX to get to those speeds?

Thanks