Now that the Subject line has your attention:
The 4790K Intel has a specific problem with higher than normal heat signatures due to the voltage regulator being on-die. It saves on cost and works great in low power mode. However, in higher performance situations it generates a massive amount of heat inside the CPU. When the CPU senses those extreme temperatures (even with liquid cooled) it starts throttling itself down to reduce heat. Also contributing to this is Intels new polymer TIM solidifies at extreme temperatures (Caused by problem #1) and reduces the heat transfer off-die; further increasing CPU temperatures.
One solution: Delid your 4790K and use a Naked kit to attached your liquid cooler directly to the die. Here's just such one Naked Kit:
https://shop.ekwb.com/ek-supremacy-precisemount-add-on-naked-ivy.
Second solution would be to actually not change anything, and just allow the CPU to keep down-throttling your CPU clock to reduce temperatures. However, if you want to get the best performance, some form of change is recommended.
Third solution.. perhaps change to Skylake. As they
stopped using Internal Voltage Regulators.
Reason I posted this, is I noticed that most people in the
your computer spec! thread had 4790K's
