NOTE: Delidding your CPU does void its warranty. If you RMA the chip it is classed as RMA fraud, please do not discuss such actions in this thread or anywhere on OCN.
Delidding is a process taking the IHS(Integrated HeatSink) off of the CPU. This process started back with Ivy Bridge CPUs.
The reason most people delid their Ivy Bridge is because Intel cheaped out and didn’t solder their IHS on the die, and instead used a very cheap TIM. What most users do is either put high performance TIM on, or they keep the IHS off completely. They way you go about doing it is by using a very thin razor very carefully to break the glue that keeps the TIM on.
Since then this has been in form and a lot of modders have successfully delidded recent generations of Intel CPU’s including Haswell.
Read More: OverClock.net
Youtuber 8auer has sucessfully delid a Broadwell-E CPU i7-6950X & i7-5960X
However The resulting decrease in temperature for the i7-6950X is disappointing so far. The reason for the inferior might be not enough contact between die and IHS. Sanding the IHS down might produce better results.