I'm looking for a solid air cooling unit for my intel 4670k. My goal is to at least OC it to around 4.2 - 4-4 GHz but have no idea what kind of cooling I need. I would say my budget is up to around $100. A big plus would also be that I don't need to install a back plate since this isn't a new build, and would prefer not to take everything apart. Any thoughts, what should I go for?
You're Boned Regardless, because MOST Air coolers, excluding Low-Profile. Come with a Backplate that have to be mounted. And the purpose of the Backplate is to keep the CPU cooler Ridged. However i Recommend the Noctua NH-D15 it's like $100 and it's arguably the best Tower-Cooler you can Get ahold of. performance wise it rivals the Corsair H110
I can vouch for the NH-D15 i have it too cool my 4670K in my system and no complaints, my cpu is currently oc'ed to 4.2 ghz at 1.2v and the temps max out on 60C
CM TX3 with a 92mm noctua fan is your best bet - uses the push pin design but the stock fan is shithouse. 4 - 4.2ghz should be doable with acceptable temps assuming you have half decent chip that wont need much extra voltage.