Safe OC for 4670k? (new to OC and forum)

Hello everyone. I have been lurking for several weeks doing research on my computer build. I am upgrading from a Dell XPS with an E6600 to a custom built PC. First off, I am not new to building PCs, but it has been a while and I am definitely new to OC. Here's the breakdown of major parts I have going into my new machine:

i5-4670k, Gigabyte Z78X-UD3H, 2x4GB Corsair Vengeance DDR3 1600MHz, Corsair HX750 PSU, Corsair H60 water cooler, Samsung 840 Pro 128GB SSD boot drive and a pair of seagate 7200 RPM raid-0 data drives (re-used) and a GeForce 550 Ti 1GB DDR5 (also re-used and will be upgraded to a dual 660 Ti 2GB DDR5 SLI setup eventually) in a CoolerMaster HAF 932 AMD edition (because I can!).

My quick question is in y'all's professional opinion, with that setup, how far can I safely and reliably OC the processor? What is the recommended voltage setting?

My longer question involves apologizing for asking a question that is obviously asked a million times over, but I can't seem to find a good answer that I understand and is written for a recent chipset. Is there a good OC tutorial somewhere for recent chips? Is it better to OC in the BIOS or use the MOBO's software? Also I read somewhere that the new Haswell cores assist the GPU in some way? Is this automatic or does it need to be set up somewhere and would it be compatible with my GPU (or am I totally off my rocker)?

You guys seem very friendly and knowledgable so I am hopeful to find my answer here. If you have any other constructive comments that may help my build, I'd be glad to hear them.

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More about safe 4670k forum
  1. OC in the BIOS < Yes don't use OC software.

    There are guides in this forum , browse through them.

    Read before you speed.
  2. What would you recommend would be a good starting point for speed and voltage with the H60 cooler?
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