CPU Cooler i5 2500k @4.5ghz

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Hyper212+, I've personally tested both 2500ks and 2600ks at clocks higher than the stated 4.5Ghz (albeit with a case with somewhat better cooling capabilities) and have not breached the 70°C mark. Although your case isn't ideal for cooling the CM Hyper 212+ will still do the job with ease.