Check the 12v rail rating on your ps sticker; if it's less then 22, then I would upgrade it. I'm not familiar with your brand, but I do know antec, corsair, seasonic, and ocz are all good brands, but you may not be able to get one of those.
Both AMD and nVIdia are conservative with their recommendations. Both companies overestimate total pc power requirements because there is a tendency among consumers to purchase very cheap, low quality psu's of questionable performance and reliability.
I am not familiar with the Dany 450W. I checked Google. The Dany450W appears to be a local or regional brand. There were search results for vendors in Karachi.
Normally I recommend Seasonic, Corsair, XFX, and sometimes Antec. However, they are not available in all countries. Which psu's are available in your country?
Link your vender if possible; that would make it easier to recommend a brand of ps. Overclocking the processor depends on alot of factors, including the quality of the power supply and luck of the draw. The motherboard bios settings are also important.