+1 for pretty much everything above.

~1.4 is the max you can push into your Sandy chip 24/7 without having to worry 1 single second. Passed this point, its all up to you... Ive seen people running 3930k at over 1.5v 24/7 but i advised them they could degrade the chip way faster than normal at that Vcore.

In the end, IMO, your better to find a good, stable, fast enough OC for your 24/7 use that stay within safe limit for the chip. I run relax OC as for my 24/7, currently a little 4.2ghz on my 3820, but i could run this chip 4.5-4.6ghz without pushing to much volts. 4.2 is enough for my gaming use, so why running faster, louder, hotter ? ... My opinion !