Difference between 1st gen core processor vs 2nd gen core processor

[did007]

Hey guys, I want to upgrade my desktop, but i am facing a problem. i can not decide what will be the best processor for my desktop.
actually i have budget for only core i5. but i heard that there is another thing that some "generation" specification is related to the core
i5 processor. can you guys tell me whats this so called "Generation"?
and can you suggest me which core i5 series will be the best for my desktop?

 

[doct3rphil]

that's referring to the architecture. sandy bridge is 2nd gen, ivy bridge is 3rd gen. I would recommend going with an ivy like the i5 3450 or the 3570K (k means you can easily overclock). each one is more efficient and powerful than the last.