skylake i7

[JerreFL]

what water cooler should i use for this cpu ? 

[manikyath]

the bigger the better.

 

this counts in general

 

the bigger your cooler, the more heat you can move, the cooler your cpu will be, AND the quieter your system will be.

[iamdarkyoshi]

One from ekwb. Best blocks I have ever used.

[Huginn]

By watercooler I assume you mean AIO cooler. Have you considered a good air cooler, for example a Dark Rock Pro 3, or noctua NH-D15. They offer similar(or greater) performance, are usually cheaper, are safer(argueably) and are often more quiet.

 

Anyway, NZXT Kraken X61, Cooler Master Nepton 240M, Swiftech H220X are AIO liquid coolers I've read good things about.

 

Edit: Might be useful if you told us which case you have. That way people can suggest coolers that'll surely fit in your case.

(And follow your topic!)