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depend what sandy?.. not the same a 2500K than a 2600K much less than a 3930K or 3960X..
Using just models a reference
for 2500K a H80i would be fine.
For 2600K a H100i would be fine(confirmed be me i have a 2600K at 5ghz with a h100i working perfect)
for 3930K/39x0X go with the best available.. Cooler master glacer 240L or Swiftech H220X (if you have 280mm mounting holes then Swiftech H240X)
I wouldnt recommend the h100i. You can easily match the performance of these CLCs with high end aircoolers.
I would agree with the above poster suggesting the Glacer 240L or the Swiftech AIO, these are expandable units and are the best AIOs that are on the market currently. You are able to replace the tubing, add more radiators, blocks ect, and would be like an entry into custom watercooling, with the convenience of an AIO.
you will be fine with the H100i.. it can handle that chip at 1.5v, but if you want to lower the temps even better then jump straight to the Glacer 240L or Swiftech H220X..