I need with water cooling my system I've recently bought a https://www.overclockers.co.uk/defc...verclocked-skylake-bundle-bu-074-og.html#t=a1 without a water cooling,system in place I was if a single radiator would extract enough heat
Hi maxi, welcome to the forum 
That bundle comes with everything needed to run stable, it all depends on the cooler selected.
What actual kit are you ordering/ordered? Going by your link I think you have ordered the EK CPU water block? as such you still need all the other bits, pump, radiator, tube , tube connectors etc.
Or did I completely miss understand?
That bundle comes with everything needed to run stable, it all depends on the cooler selected.
What actual kit are you ordering/ordered? Going by your link I think you have ordered the EK CPU water block? as such you still need all the other bits, pump, radiator, tube , tube connectors etc.
Or did I completely miss understand?
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For just a CPU you might be ok with a single 120 rad but you will be a lot better with a 240 rad. The 240 will allow you to of higher or run the fans slower. Hope this helps.
The thing to be aware of is most people buy water cooling "I want it cooler and quieter" A single 120 is not going to do that, it will be similar temps to air if not higher and generally has to have high rpm especially if over clocking.
A 240 Rad I would say for a CPU loop is a minimum, I would prefer a 280 (140 mm rad type) or even bigger if poss (A lot of case can fit a 360 in the roof section)
With a single small radiator I think you will be disappointed.