Let's find out how far we can upgrade this "obsolete" Late-2012 iMac we got for $20 off Marketplace. We'll replace the CPU, replace the RAM, change all the thermal paste, and try in vain not to completely F**K IT UP!
[**CORRECTION**: I said in the video the Intel i7 3770 3.4ghz was the fastest processor for this model. I misspoke here. It's actually the i7 3770S 3.1ghz that's the limit for the Late-2012 21.5" model. The 27" model from Late-2012 will take the 3770 3.4ghz.]