If you upgraded to say, an i5-4670k/4770k, you might see ~30% increase in performance before overclocking. After overclocking, that might jump to ~40-45% depending on your chip luck and the cooling methods used. A decent 4670+motherboard+RAM+cooler will run you just about $500.
On the other hand, today MemEx has 7970's on sale for $330 bucks. If you have a motherboard and PSU that can handle 2 of those puppies, you'd be pretty ballin', though CrossFire is a bit trickier to work with than SLI.
OTOH, you could buy a 770 for ~$420 right now (or a 4 GB for $520), which is about 60% faster than a 580.
In summary, a new videocard would probably give you better numbers than a new CPU setup, however you are running 4 gens back on processors, and generally there is about a ~7-10% increase in performance per processor generation.
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Originally Posted by MrMastodonFarm
Settle down there, Temple Grandin.
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