Chosen Solution
I bought an imac at the end of 2013,its has the i5 chip in it, can i replace it with the i7? Ive allready maxed out the ram and installed a 512 gb samsung 840 pro ssd.
That model came with an i7 as an option so if you can find a logic board, you can swap it in.
The CPU is replaceable. Here’s an excellent answer to this question by Dan: CPU upgrade for A1418 (EMC 2742))