Maybe this will shed some light.
Your CPU and modern games: A guide to those building.
It's not all about GHz or core count. The architectural difference makes it so the i5 3330 is about double the speed of your C2Q clock for clock. You want more money towards your GPU considering an i5 3330 will be enough to hammer out games for the next 3-4 years.
Edit: I'll further iterate this by saying, the Q9400 is still a respectable CPU in terms of gaming performance. I have a Q8200 in my fiance's rig and it runs any game just fine. It and one of my 580s plays any game I want it to without problems.
An even older CPU still stands a respectable chance against today's games as shown here by this site.
"Resolution is just a number." #Ubisoft Origin/Steam
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