Extremely beefy system, low FPS. -_-

A sufficient clock speed is a clock speed that's the highest possible without going over 1.3 volts. Doesn't matter what cooler you have with voltage, coolers just cool the CPU, and better coolers do better. Since you have a Noctua, I'm guessing you either have a D14 or D15, which you are entirely correct, they are high end coolers and will bring you far. There is one exception however to this safe voltage, and it's if you barely use your PC. If this is the case, you can probably get 5 years out of it if you don't go above 1.35, but I do not suggest it at all. Better to be slow than sorry.

Anyway back to what I said about best GHz, CPUs, just like all other electrical components, have voltage coming in (I don't know a better way to say it). The amount of voltage that will give you 5+ years of CPU use is 1.3 volts on most Intel CPUs, yours specifically. Anything lower will increase the life span of the CPU - higher voltage will take off days, months, or years depending on how high it is (1.4 for example will take years off your CPU), and how often you use the PC. Anyway, when you turn up the clock speed, you will need higher voltage. How much? It depends on the CPU. You have to play the "silicon lottery", which basically means that when you buy an unlocked (overclock-able) CPU, you can either get one that uses voltage really well, one that sucks ass, or one in between, and the only thing that can determine how good it uses voltage is luck. So hopefully you won the silicon lottery, as it's much more important than having a good cooler (which is why some people with 30 dollar coolers can go higher in clock speed than those with custom water loops). Anyway, cooling comes in to play since when you make the voltage higher you need to sufficiently cool it, as heat can kill a CPU very fast. This doesn't mean you can set the voltage as high as your cooler will cool however — a thing called electromigration will kill your CPU over time (even if the voltage is low), and will only kill it quicker if you turn your voltage up more. You can look it up for more information, as it's kind of complicated.

So since you got all that, now I'll tell you how to actually overclock. First up, you'll need a stress tester. I would suggest AIDA64, but it costs money, and the human race shouldn't have to pay even more money just so they can turn up their CPU speed :3. So I suggest OCCT, I used it, it's great, and it's free . Anyway, with that downloaded, restart your computer and load up your BIOS. Go to the overclock section, and go to clock speed first. Increase it by very small amounts, like .1 or .2 GHz. Then go to the voltage section. Turn off auto voltage if it's on (that's a nice way to kill a computer), and set the voltage to about .05 higher at maximum than it currently is. Then save and restart. When your computer boots, IF it boots, and you don't get a blue screen of death (which I'll explain after), turn on the stress test, and stress test the PC for at least 1 hour. I also suggest monitoring temperatures with a monitoring program (I forget the name of the one I use, if you want to know it just ask me after ). If you monitor temperatures, and you definitely should, make sure the temperatures go no higher than 80°C!!! Now, let's say the stress test is successful! Turn up your CPU voltage by small amounts (.05 at most) in the BIOS again, and turn up the clock speed by .2 at most (aka repeat the process from before). But let's say at some point it fails, like if your PC loads, or more commonly, during a stress test. Then you'll probably get a blue screen of death, which is a screen that shows you all the errors on your PC and says your PC failed. If you get that, OR sometimes if you leave your computer on while it's stress testing, then turn the monitor back on when an hour at least has passed, you'll see a login screen. What do these mean? You suck. Just kidding, they mean your overclock wasn't stable, and you didn't add enough voltage. So now go back into the BIOS and turn up the voltage at most .05. Note though, you can go as small as .001. Anyway, after that, stress test it again for at least 1 hour. All the stress testing is why you need to turn on your island timer, as overclocking can and probably will take at least one day.

Now, you've finally reached your speed below the "safe voltage" (the 1.3 or below zone with the one exception I mentioned). What now? Well, you could just go and have fun with your higher FPS in Minecraft, but there is something that's smart to do. Try to turn down the voltage by very small amounts (like .02 at most), and try to stress test it to make sure it works in the 1+ hour period (by the way, more hours is better, as it just means if the CPU can survive it, it's more hours the CPU can handle under load). If it survives that period, congratulations, you increased the life span of the CPU!

Anyway, I hope that was detailed enough xP, but for more information, you can literally Google "how to overclock a CPU" and find tons of videos and articles on it.