As there was insufficient room at the top of my smallish Corsair 100R midtower for the 2nd shifted upwards 140 mm fan to be mounted/attached directly to the intake side of the Noctua NH D15, I simply used the 2nd supplied 140mm fan as in intake case fan...not that it was really needed anyway.
We have the same exact CPU cooler, the one I have is on my main PC with Intel Devil's Canyon 4790K, temps are great at idle & under load. No more thermal throttling with benchmarking with Intel XTU.
Unfortunately, would had been better off with purchasing another for the PC with it's little brother, the i5-4690K, am using a Cooler Master Hyper 212, although with two Noctua NF-F12 fans, considering the cost of the fans & cooler combined, would had saved by the purchase of a 2nd Noctua NH-D15, plus had two cooling towers, rather than a single. Still, temps are decent with the push-pull configuration & I don't have to hear that fan rattle any longer.
BTW, that fan would make a better case one for a budget build, rather than a CPU cooler, is flimsy at best, weighing literally nothing in comparison with the NF-F12 fans. Both are independently controlled by separate CPU can power ports (the 2nd is on CPU_OPT). The other issue with the Hyper 212 is direction, rather than blowing towards the exhaust, against the back wall instead. Tried every way to mount in other direction & couldn't.
Still, one thing that helps on all three of my main PC's are that these has two intakes, even if 3 pin fans, speed can be controlled using the settings within the UEFI on both ASUS & ASRock MB's, plus a 120mm exhaust for all three. Two has some degree of natural open air top exhaust with dust filter, so stays cool w/out a fan installed.
Bottom line, adding fans w/out planning isn't the right way, rather adding in the right places. Most premium cases will usually have these pre-installed, while quality varies, one should keep a couple of extra premium fans on hand, so when one begins to rattle or not work at all, can be quickly replaced. While costly, I cannot recommend Noctua enough, having an industry leading 6 year warranty, all kinds of extra wires/cables in the package more than makes up the cost & have peace of mind. Being 4 pin cabled also means a more precise cooling curve or selection in the UEFI (or BIOS).
Three to four high quality fans placed in the right positions will go much further than seven all over the place, what's desired is a strong intake of cool air with an exhaust flowing together, which dispels the heat from all components.
Side fans can disrupt the natural airflow, and why I don't install any, even on cases that supports these. Some of these may have an open space, good for passive intake, not so good for an intake fan, although some uses a cone for AMD CPU's with stock coolers for added downwards airflow to the CPU. In this case, a fan there may be good for that purpose (forcing more cooler air onto the CPU heatsink), still will disrupt the natural airflow to some degree by the cone being there. I don't install these myself, although have seen these on builds. my AMD PC's (FX-8350 & 6300 based) doesn't have this type of setup. The one with the FX-8350 has the same Hyper 212 EVO setup, only with a single Noctua NF-F12-3,000 PWM 120mm (3,000 rpm) fan, which would also work as an exhaust if speed is toned down. Too strong for an intake, would have to lower too much to best utilize the fan. My review of it is the one dated 01/20/2017 & found to be helpful by one Newegg member. Want a fan, here's one to behold.
Now I know why this fan is an 'Industrial Series' model, is now running Level 6 (out of 10) speed & not loud, although was in my i5-4690K build other than in Standard Mode. Need a powerful exhaust fan, look no further than above, if the PC is on wheels (noted in my review) at full speed would double as a leaf blower, it's not going to leave any accessible hot air inside.
Edited by cat1092, 18 June 2017 - 05:28 AM.