http://sites.amd.com/us/documents/amd_fx_performance_tuning_guide.pdf
^For when you get your new beast card.
Disable turbo and set cpu multiplier to turbo supplied multiplier and set vcore to turbo supplied vcore.
A little confusing at first but lets say if your ram is rated for 1866mhz.. you can set it to 1600mhz at the voltage and timing for 1866mhz then set the fsb to 233 and it will increase your ram speed close to 1866mhz but will also be increasing your ht, cpu-nb and cpu speed so drop the multipliers down to around the default values at first before you start overclocking.
having a larger fsb will give you lower voltages for higher clock rates.
4.5ghz with a moderate increase to your cpu-nb should be pretty decent.
The guide explains a lot and you should check out the AMD overclocking club here at toms.
Dont forget your minimum Cooler Master Hyper 212 EVO and to check the power requirement for your new card!