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I've been doing a lot of testing lately – now for me a PC not only has to look good but it has to perform well (as a rule I normally build from the components out tailoring the case to the needs of the hardware); Haswell has always had a reputation of being a heat hound, I'm one of the lucky ones that possess a CPU in the form of my 4690K that doesn't do to badly in that department. With the concept of a future build in mind – this will be small form factor, overclocked, an energy efficient general purpose come gaming rig with some graphical cojones and a decent onboard audio capability (tall order I know and did I also mention I wanted it to run virtually silently?) - I set about reaching an overclock compromise between performance and an energy efficient voltage for my own needs. I decided I wanted my overclock to be a nice round 4.4GHz, only 4.4GHz you may ask - 4.4Ghz in my hands on experience offers the perfect balance between efficiency and performance, on paper it equates to a 25.9% boost over stock speeds. I achieved the overclock I wanted after some trial and error at 1.132V Now time to test it - For stress testing I use Intel BurnTest, BurnTest will stress both the overclock and memory far in excess of anything you or I will ever throw at a CPU. A sedate 30 loop pass at Standard level for openers. Followed by another 30 loop pass at Maximum. PASS Now 90 minutes of OCCT 4.4.1, I use the Large Data Set Test Mode to flush out the likelihood of errors under full load. PASS And finally to see how it performs - Very happy with that :D A final note, you may be looking at the temps throughout this thinking what's to shout about? Well when you consider I've used an air cooler utilizing the silent fan profile of the AsRock Z87M OC Formula and it runs silently – it becomes apparent why I'm so pleased ;)