I have checked the mounting and the cooler is mounted securely it cannot be mounted any tighter than it currently is, without damaging the motherboard or the cpu iteself. I honestly cannot understand why the temps are so high, I know that Intel have had issues with CPU temps since Ivy Bridge, but these temps to me are shockingly poor and something that I would not expect from a AIO and I would expect them more from the Stock Intel Cooler. Here is a video I uploaded showing OCCT running before changing the fans and then after.

I have purchased a temperature monitor for the room with my system in it, and it is currently 23.6c ambient temp and the cpu is basically at idle now whilst I am posting this, and the core temps are 27c 27c 28c 29c which seem really good but as soon as the CPU usage goes up when either, gaming or encoding a video the temps just skyrocket. I have checked that the pump is running and it is running at it's maximum speed according to Corsair Link when I managed to find a thread, with the registry changes required in order to get it to identify and pick up the H100i. I had previously done that which knocked the core temps down to what they are now, as prior to that they were hitting 90c. I have searched the internet for ideas on what could possibly be causing these temps and, eventually I found someone saying to put some washers on the back of the CPU Socket behind the motherboard on the backplate, for the cooler in order to make the backplate more secure. The CPU Core Voltage is 1.250v set the bios as that is the lowest I can get with the system remaining stable. Today I have swapped the fans to 4x Akasa Apache Black 1300rpm fans and the max core temps now are 81c which is lower but still stupidly high. My system which is the 4790k is where the issue presents itself, originally with the Corsair SP120 Quiet Edition, fans on the H100i I was getting max core temps of 85c which is no better than the stock Intel cooler I would suspect. Now the 3930k's max core temps are 60c to 70c when using OCCT with AVX enabled, and the H100i on that has 4x Scythe GT1850 fans on it in push pull, with a ambient room temp of around 25c. The first system is a 3930K based system which is overclocked to 4.0Ghz and the second is my system which is a 4790k based system running at stock speed. Basically I have a few systems in my house 2 of them are cooled by H100i's.

Intel burn test 4790k