RustyRagdoll,
Although your Raijintek Aidos is a very capable 92mm fan class 4 pipe direct touch cooler, the reasons why your i7-4790K runs warmer are due to the fact that it has HyperThreading, as well as base and boost clocks 900 MHz and 1100 MHz faster than your previous 84 Watt TDP i5-4440. This means at 100% workload, the 4440 requires less Core voltage so power consumption peaks well below its Thermal Design Power (TDP), which is a shared design rating that pertains to flagship processors such as the 84 Watt 4770K and the 88 Watt 4790K.
My esteemed colleague,
Darkbreeze, has provided you with some excellent air cooling alternatives, as has our very astute Herald,
Karadjgne, however, there's another approach you might find very interesting. Delidding is an extremely effective method by which Core temperatures on TIM'd processors can be significantly decreased at a cost similar to that of a decent mid-range cooler, thereby eliminating any concerns you may have regarding size, fit and thermal performance.
Since your signature mentions that you're a mechanic, you're no doubt very handy and are especially proficient in working with any tools. Rather than delid using the somewhat risky razor blade method, you can safely delid with a "delidding tool":
der8auer Delid Die Mate 2
Dr. Delid
Rockit 88
Silicon Lottery is a very reputable company that tests, bins and sells overclocked, delidded "K" CPU's. They also offer professional delidding services, and provide the following figures on how much Core temperatures at 100% workload are improved by delidding:
9th Generation ... Coffee Lake Refresh - 3 to 7°C
8th Generation ... Coffee Lake - 12 to 25°C
7th Generation ... Kaby Lake - 12 to 25°C
6th Generation ... Skylake - 7 to 20°C
5th Generation ... Broadwell - 8 to 18°C
4th Generation ... Devil's Canyon - 7 to 15°C
4th Generation ... Haswell - 10 to 25°C
3rd Generation ... Ivy Bridge - 10 to 25°C
To illustrate the scope of this problem, thermal characteristics among soldered and TIM’d processors are compared below:
Except for 9th Generation, Core temperatures on processors with Indium solder between the Die and Integrated Heat Spreader (IHS) are typically within 5°C above IHS temperature, which indicates good thermal conductivity. However, Core temperatures on processors with TIM between the Die and IHS vary up to 25°C above IHS temperature, which indicates poor thermal conductivity and uniformity.
Although 9th Generation is soldered, the Die and solder are both considerably thicker than 2nd Generation and earlier processors, which adversely affects thermal conductivity. Core temperatures and IHS temperature converge at idle and diverge as load increases. Here’s how soldered and TIM’d processors differ between idle and 100% workload:
Thermal behavior is relatively uncompromised at idle due to low Power dissipation. But as workload approaches 100%, poor thermal conductivity among TIM’d processors becomes apparent. Moreover, as Intel's TIM degrades over time, 3rd through 6th Generation 22 and 14 nanometer processors, (launched 2012 through 2015), may no longer cool as well as when new. Delidding restores and upgrades thermal performance similar to that of soldered processors.
Note: Intel uses
engineering samples with
soldered Integrated Heat Spreaders for testing and developing specifications.
I have personally delidded many "K" processors from 3rd Generation, when Intel began using TIM, to 8th Generation, and have used the razor blade method as well as delidding tools. I've also run 3rd through 8th Generation TIM'd processors in my personal rigs, all of which I've delidded, and wouldn't have it any other way.
We have a Guide that covers this topic;
Intel Temperature Guide. See
Section 9 -
The TIM Problem.
CT