The following URL will give you details on the features of each processor with their differences highlighted:
Any of these two processors would be enough for the tasks that you have mentioned, so in that case, you might actually check if the rest of the hardware would comply with those requirements and see if the video card and motherboard combination are compatible, so you should check with its respective manufacturer for that.
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Honestly, for your needs an i3-3220 will be more than enough, for what your describing the prescribed build is way over-kill.
This is the upgrade I would recommend
I recommended a small 64GB solid state drive, install windows and all your apps on this baby, it'll make your computer fly! You can still keep your HDD for pictures and downloads, and just in case your ekked for space you can start installing programs on it too.