I'm building a pc and i am looking to overclock my i5 4670k and I'd like to know if there is anything important that i need to know. Do I've heard that high speed ram helps and I'm certain my corsair 750 watt power supply is sufficient with a gtx 770 and a decent z87 motherboard but is there anything else i need?
Get a decent CPU cooler. Any Noctua cooler will be fine, or if you are going budget get a CM Hyper Evo 212. I have my i5 4670k clocked at 4.5 Ghz atm for stability, but I can get it to 4.6 Ghz, and thats on a Hyper evo 212.
http://www.amazon.com/Noctua-Silent-Cooling-NH-U9B-SE2/dp/B0065SFEE8/ref=sr_1_4?ie=UTF8&qid=1398628452&sr=8-4&keywords=noctua"
would this noctua outperform a 212 evo? and another question i have is, should i add more case fans?or would i be fine with the included case fans?
The NH-U9B will outperform the 212 evo. As far as case fans go, I suggest you install as many as your case can support. More fans = more airflow + lower fan speed - system noise
For overclocked rigs there is no such thing as too many fans lol. You can crank em up for amazing cooling or turn them down for still decent cooling but very low noise.
What motherboard do you have?
I'd recommend the Noctua over the Evo. Especially if you're going to be doing any serious overclocking on Haswell. They gets hot.
RAM speed doesn't make a difference.
Essentially raise your CPU's multiplier in the BIOS and then while monitoring your temperatures stress your hardware. If it crashes go in and keep raising your voltage a little bit at a time until you can get it stable or the thermals start becoming an issue.
Keep in mind that with air cooling you can't get cooler than your ambient temperature. So if you live in a warm climate you might want to look into water cooling. There are excellent closed loop coolers such as the H100i that should be able to get you to ~4.7 GHz.
Biggest tip I can give you is be patient, you could bsod a lot, and I mean a lot, log your changes on a second device or a piece of paper so if you have to clear cmos you don't run the risk of forgetting. And again be patient it could take hours, even up to a day before you get a OC that you are happy with and stable.
Of course if you are only going to OC by 100 mghz or so then everything I just said probably wont happen.
"Keep in mind that with air cooling you can't get cooler than your ambient temperature." unless you are doing sub zero cooling, or some crazy thing like the cryo-z, then no cooler is going to get below ambient its physically impossible.
This is also baring any putting the closed loop, res, or some other cooling component in the fridge or freezer to cool them off. Yes you can get cooler then ambient but the cooler is not going to do it by itself.