Tips on overclocking an i5 4670K

By increasing cpu voltage and and increasing the multiplier and setting the cpu in O.C profile through the bios.
for stability test,use stress test program like PRIME95 and torture test it for 5-6 hours.If it doesn't crashes then it's ok,otherwise adjust carefully

well i never used z87 or z77 boards but by the concept of O.C ing i can tell u that the more u increase the voltage,the more ur processor's lifespan degrades. So,increase the multiplier by 3-3.5x(i.e.,if the multiplier is set to x18, then increase it to x21-21.5)and the voltage to adaptive and check it's stability by running PRIME95 for 5-6hrs.

Use TuboV to O.C ur processor, adjust freq., multiplier e.t.c .Yeah u can do that and from there u can tune your cpu's frequency,voltage. check this link, it might help you:
http://www.hardocp.com/article/2013/06/03/asus_z87a_lga_1150_motherboard_review/2#.UckeNZYVXfI

there aren't such disadvantages, if u are a beginner, then try to O.C with this at first if u are not so sure that u can O.C from bios.
and it will also give u stable result.
At first try increasing the voltage by a bit and the multiplier also and see that it's stable or not using prime95 for 5-6hrs and u have a good cooler which would help you much in O.C ing.

I got my 4670k to 4.5 Ghz with about 1.190 V, initially I tested to see if I could get the system to boot by setting multiplier to 46 and volts to 1.2.

I would not recommend adaptive voltage in my opinion, because I found it ran voltage higher than it needed to be and this results in higher temperatures. So if you are looking to get the most with the least adaptive is not a good choice, manual control is everything. If you just want a stronger processor for the sake of it and don't want to learn about overclocking too much then sure use automatic controls, but it is frowned upon to let the computer make decisions that you should be making

To justify, as well, the point of initially setting my multiplier to 46 was to find out if I had one of the good chips or one of the poor ones, it booted and was somewhat stable at 4.6 ghz and 1.2 voltage, but I wasn't liking the heat numbers.

Correct methodology after this initial test is to start somewhere reasonable while finding your overclock, reasonable being usually ~42 multiplier @ 1.2V and check for stability and watch your temps your goal is to keep them below 80C(Some people will say 80C, others will say 70C, you decide nobody really can say with this being new tech)

If your system is stable with stress testing like intel burn test or Prime95 blend test for an hour or so, then your system is at least somewhat stable and quite possibly completely stable so you can continue raising your multiplier. So now 43 @ 1.2 volts, stable? If No (turn back multiplier or raise voltage by 0.01 and retest) Else(raise multiplier and retest)

It is by this method that I raised my multiplier, checked stability, and it was constantly ok. I hit 4.5 but I am on air cooling and my temps were not so great at that point, ~85C so I started lowering voltage by 0.005 increments and testing stability more, this stage is fine tuning by the way, I got voltage to 1.190V, any lower and my system was freezing during stress testing. So I kept it at multiplier 45 manual core voltage set at 1.190V and stess tested several hours, was fine, been gaming and such for days and system is proving to be stable with temps(outside of stress testing) never going above 60C.

My system, by the way:
asrock extreme6 z87
i5 4670k
hyper 212 evo cooler
budget mid atx case thing is worthless gonna spend real money on a case next time after this awful thing
gtx 560 ti because I didn't have the cash to upgrade it yet
samsung 1600 2x4gb dimms
other stuff that doesn't affect this discussion

Hopefully you find this information helpful, I like you probably are, have heard that haswell sucks for overclocking but so far I am either lucky or good I suppose it doesn't matter which

And disclaimer, this worked for me, if you decide to try the same method as I have it is NOT my fault if you fry your chip, overclocking can be hazardous to your computer you should know & accept the risks before partaking and be able to take everything that anyone says with a grain of salt, and be able to accept the potential consequences of the changes that you are making to your computer

Well 1.35v is pretty high voltage for these chips, so toning it down was the right move I would say. That minor overclock is decent but I believe you could do better than 4Ghz, given that your chip boots at 4.6 1.2V you allegedly have one of the good ones, as many aren't capable of that hence all the haswell hate.

I am not familiar with AI Suite, but I am going to assume that is ASUS UEFI? I can tell you though that intel chips since Sandybridge are only overclockable with the ratio changes, changing the bclk will raise the clock speed on not only the processor but on all of what used to be controlled by Northbridge so you do not want to deviate from 100.00 bclk or risk breaking stuff really quickly, and permanently. Only AMD chips are variable with that I am led to understand.

To do all of this manually through the UEFI or BIOS, all you need to do is change the CPU ratio and change your voltage from adaptive to manual override, assuming such an option exists. As long as you are on manual, you do not need to worry about the computer using too many volts and creating more heat, and you don't need to worry about the complexity of offsets so ignore offset voltage as well. The pure simplest way is simply setting one number once manually until you determine your stable numbers and state, once you have those you can go back to adaptive.
The reason you don't use adaptive now is that during stress testing, even if you set maximum voltage to 1.20, if you are on adaptive the processor can still request up to 1.37V and recieve it despite your preset maximum. Apparently this is only an issue during stress testing though( I have not verified this) and the system usually is not able to request that much extra voltage, but adaptive is great for day to day use so I would set that for my 24/7 once I have my overclock worked out and am done with stress testing.

With your gear, I wouldn't be suprised if you could get and maintain a 4.7ghz overclock with decent temps on that watercooling loop, that does depend on your chip though and most people seem to be happy keeping a 4.5ghz overclock for daily use. It is your decision though where you are going to stop and I believe you will reach your own natural point of comfort so have at it and mess with your numbers a bit!

Also, Intel burn at Standard seems to keep most people happy. Wether you accept standard or demand more is purely your decision. Standard in this case, really does mean standard.

Sorry, had a night with the daughter completely forgot about what I was helping you with

Yeah, your PC just needs to post/boot windows, passing stress tests at 1.2v 4.6ghz is unlikely you need more voltage for that, as you said north of 1.3 which is not without risks. So if you want to stay at 4.5, that is a good choice for a 24/7 clock and your temps sound good too.

As far as the gaming crash, the games you play are sometimes a better indication of stability than any stress test. So if you recieve a crash either with gaming or with stress testing, keep at 4.5ghz and raise your voltage by .01 and retry. It really sounds like you've pretty much found your spot you just need to keep making small adjustments based on how your system accepts the overclock. You could just jump up to 1.24V or something to save time stress testing, but thats what the computer would do...
You should take the time to get your max voltage unlder load determined so you can set your computer back on adaptive with the right numbers. In my opinion at least...

Edit for clarification: Stability is not determined by the temperatures your system puts out or by passing one stress test. It is one of the factors you need to balance around though. Overclocking generates more power, but draws more power so it can cause system instability. To correct the system instability you give the chip more voltage, in small increments, until you have your stable state again. The raised voltage has increased heat generated, so now you watch your temps now that you are stable so that you can ensure it is a safe setting for your computer longterm.

Stability in that equation, real longterm stability, I see many people say it takes 12 hours of prime95 to really get an indication if your system is stable, and even then some games can still crash the computer where the stress test could not. Think of it as bug hunting in software... You are doing everything you can to see if you can crash your PC through use, if you are unable, then your system is stable!

yeah , i completely agree with Kadathan, after O.C ing try to play the modern games which would be better than the stresss tests as that time the real power of your get's utilized.
try decreasing the voltage by a bit and then play a game and see that if it crashes.

no not by much.the O.C you did is fine ,now try to do a stability test either by running prime95 or by playing games

What is your vrin set at? Also your cache voltage

ASRock calls Vrin the cpu input voltage. Not sure what asus calls it.