How much does it cost to upgrade a 3rd gen Intel core i5 processor to 3rd gen Intel core i7 processor, in a gaming desktop/tower?
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It depends on what version of the i5 you have, and then it depends on what version of the i7 you want. It would probably cost you around 100$ bucks. Tell us what version you have and what version you want.
If the upgrade is for gaming performance then it's a waste of money. An i5 3xxx is all you'll need for gaming.
They're all correct! Now if you really need more performance you can buy a 6 core i7 for $600-$1000 which I'm not even sure that's compatible. Simple, if you want to upgrade it will be around $300 with around %10 performance increase.
I would just wait to see what haswell brings (price/performance) then I would upgrade. +you don't really need a upgrade if your just gaming but hey it's your choice