Please help with upgrading my PC specs

So my computer is being bottle necked by something and i think it's the CPU, lately my PC i taking literally 3 minutes to start up now if someone can help me identify the problem i would be most grateful! Specs are as follows: Intel 1.5-3470 3.20@ghz -(I think this is the problem) NVIDIA MSI GTX 970 GPU Corsair CX750 powersupply 8GB RAM 64 BIT If i'm correct in saying it's the CPU then i was looking at getting this CPU and Fan in replacement: With my current setup if i were to get that CPU would my 750W Power supply be able to run it, this is for 'hardcore gaming' Any help would be deeply appreciated, thanks for your help!
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