Originally Posted by malmental
BangBangPlay - he's not overclocking and if he does it will be slight.
(but agree with where your going...)
Well it is always nice to have that headroom, especially with a K series. The 4670K has been great for me, temp and performance wise. I have only see it throttle in Linpack while trying an OC of 4.8, which I never did bother to stabilize. The reason being temps and not necessarily voltage. I am only at 1.285V for 4.7, but everything above 4.6 sees diminishing returns gaming and benchmark wise. In order to stress 4.8 properly I would be limited to Prime and OCCT, which are great programs, but take a long time to find errors. I like to test my OCs with IBT and Linpack first and then dial in the long Prime or OCCT runs.
So basically a water cooler will allow you to a bit more flexibility once you get over 1.20-1.25V. I have seen guys on air with OCs in the 1.300V range, but they take forever to stabilize them for the same reason. So the although closed loop coolers are only slightly better at dissipating temps, they can mean the difference between settling on a slightly lower OC. We see the same thing happen here with our GPUs.
If I could do over my recent rig I would have gone with the swiftech H220 cooler because I could have easily added a GPU loop. The swiftech rads are considered all in one, but can be changed to support additional components or rads.