Custom Streacom DB4

Well, this makes no sense at all. This redditor is using an internal CPU cooler with Streacom's flagship chassis. The case itself is used as a GPU cooler only. The DB4 has no magical power and will not help CPU cooling in such a scenario. In fact, it's worse than the majority of PC cases. Unsurprisingly, a fan had to be added. 

Source: reddit