Deepcool, and you (more importantly) will be pleased to hear that the AK400 Zero Dark Plus performed really well! It offers decent cooling performance out of the box, looks decent enough, and comes with two 120mm fans pre-installed out of the box. Especially when you factor in our 10700k CPU outputs 205w of heat under full load at 5.0GHz.
So this ID Cooling IS40 is much better than stock CPU cooler?
Yup, but most things are better than the stock cooler!
It depends on which CPU have used. IS40 for i3, IS50 for i5, IS60 for i7 of course each on stock speed.