Well I decided to upgrade my SB i3 to 4 cores because I think now it s the right time because there are people selling their i5 chips in affordable prices.
I found 2 good offers.. one of them i5 2400 and other i5 2500K
Price difference between them is only 25 $
So i5 2500K seems a no brainer but there comes the question that it is an unlocked chip which is used for 1 year. I don't know how intensive and often it was overclocked by the user. I know that overclocking decreases the life span of the chip and it might even decrease the performance of it and damage it. Should I take the risk buying i5 2500K or should I go for only couple of months used clean i5 2400.
User of the i5 2500K remarked that he did not overclock the chip. I also checked his previous messages and it looks like he was searching for a CPU cooler couple of months ago He says he could even accept my i3 in exchange for i5 and some money plus from me.
4.0 ghz is easy to obtain, personally, I would go 2500k assuming if you have the correct mobo to do so. if not, I'm a person who prefers to recommend ivy bridge processors for the non k series cpus. but since your getting it from someone, I wouldnt know the price.