geofelt :
I have a question for you:
Why do you think you need liquid cooling for a I7-6700K?
14nm skylake runs cool. You will run into safe vcore limits before you run into thermal limits.
My canned rant on liquid cooling:
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You buy a liquid cooler to be able to extract an extra multiplier or two out of your OC.
How much do you really need?
I do not much like all in one liquid coolers when a good air cooler like a Noctua or phanteks can do the job just as well.
A liquid cooler will be expensive, noisy, less reliable, and will not cool any better
in a well ventilated case.
Liquid cooling is really air cooling, it just puts the heat exchange in a different place.
The orientation of the radiator will cause a problem.
If you orient it to take in cool air from the outside, you will cool the cpu better, but the hot air then circulates inside the case heating up the graphics card and motherboard.
If you orient it to exhaust(which I think is better) , then your cpu cooling will be less effective because it uses pre heated case air.
And... I have read too many tales of woe when a liquid cooler leaks.
google "H100 leak"
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Your pc will be quieter, more reliable, and will be cooled equally well with a decent air cooler like a Noctua NH-U12s.
I'm sorry, but some of these points are factually incorrect.
Liquid cooling is not like air cooling.
Air cooling works through a fan on top of the processor that directly applies cool air on top of it.
Liquid cooling works through a thermal compound, where the heat from the processor is cooled by the coolant, with the thermal compound in the middle. The coolant is cooled in the radiator, where fans blow cool air on the coolant, which then cools the processor through the compound. This is not "basically the same thing" as air cooling.
The "orientation of the radiator" will not cause a problem. For larger radiators you need larger cases, which are designed now to accomodate it, typically on top, but some Corsair cases on the bottom. Even for mid towers, there are smaller liquid cooling kits that can be oriented on the back of the case, where one of the case fans would typically go.
I also think you are confusing liquid cooling with the fans on the power supply. Liquid cooling of the processor does not "suck cool air in"
The fan on the power supply should be oriented away from the internal components and facing outside of the case, whether its positioned on the bottom or top.
The fan on the power supply is sucking cooler air from outside of the case and blowing it back inside to help keep everything cool.
The fans on the radiator of a liquid cooling kit are not sucking air from anything. They are directly applying cool air unto the coolant.
Yes, leaks happen, and is an inherent risk when liquid cooling. One should always do regular checks for signs of leaks. The risk of leaks is magnified with overclocking cause of how hot the coolant is getting.
Liquid cooling is substantially quieter than air cooling. The majority of the noise from a computer is coming from the cooler of the processor. The fans from the case fans and power supply are much quieter, and thats about what the fans of a radiator sounds like.
A computer's noise is substantially reduced, and temperatures also go down by a lot with liquid cooling. It is more work and more risk. But depending on your overclocking, and whether or not you want to reduce noise, will answer whether or not its all worth it.