what games are you trying to run?
check the games' system requirements and match them with yours.
be ready to turn down all the gfx settings to the lowest to get some games running.
both the entry level dual core cpu and the entry level gfx card will deliver low fps.
Select game you wish to play and see what the result is, but I agree with De5's statement on h/w caps
You posted as I did, that new kit will be a definite boost for you, what is the rest of that build going to be, and are you in the UK?
couple of important questions though,
Do you think you will ever overclock the chip? if so, you will need an aftermarket cooler, the one supplied in the box with the chip wont handle much extra heat well,
are you re-using your old psu or buying new? if old one, find any marks/labels you can and feed us some info, a bad psu can kill you or your pc (I'm not joking either)
Ok, so stick with the standard cooler for now, no problem,
Corsairs Cx500 is one I recommend quite a lot for lower end builds,
theres a psu calculator http://www.thermaltake.outervision.com/ put your intended build into it and see what it recommends but I think a 450/500W unit is going to cover you easily, http://www.tomshardware.co.uk/forum/284314-10-power-sup... should be a good point of reference too, and once you find a psu you are considering, google 'ZXC500w psu reviews' and see what reviewers and owners say about that one,
if you don't know the one you currently have,
I would strongly recommend having a new one in the new build, how gutted would you be if the old psu killed your new chip and board?