While mounting a CPU cooler directly on the CPU that has been delidded is mostly reserved to experienced users and overclockers the gain is undeniable so it does not come as a surprise that there are both products for delidding as well as instructions for the process, such as the one from SiliconLottery for Direct Die Mounting of a Broadwell-E CPU.
While this certainly voids your warranty and as there is a good chance to you could mess up your CPU, delidding and using the CPU without its original IHS is certainly reserved for extreme overclockers and experienced users.
Since the height of the CPU is much lower when the IHS is removed, there are certain things that need to be done if you want to use the CPU, like the lowering of the backplate and there are even certain motherboards that are compatible with Direct Die Mounting.
Silicon Lottery, which sells the Broadwell-E Delidding Solution for US $69.99 and you can expect anywhere from 8°C to 15°C decrease in temperatures if the heatsink or liquid cooling block is placed directly on the CPU with a liquid metal TIM.
Silicon Lottery also published a full Direct Die Mounting instructions which show a bit more details regarding the process and says that this is compatible with 6800K, 6850K, 6900K, and 6950X CPUs.
You can check out more via link below.
Source:
SiliconLottery.com.