flyproductions
1.
Did you see in my post that that side panel is actually from a cMP 2,1 ? my current cMP is a 4,1>5,1.
( I also drilled a hole in that side cover to insert a drive-activity LED which is attached tomy Samsung M.2 970's M.2 PCIe adaptor - very useful ! )
2.
I replaced that "clunky" USB-external DOCK ( it's not a HUB. - with a USB 3.0 two HDD/SSD drive extrnal DOCK which is powered from it's own AC power adaptor and is attached to my Inateck USB 3.0 PCIe card
3.
The "black cable is no longer there.
4.
I live in Japan. This summer, in August we had many days with consecutive 39 ~ 40°C / 102 ~ 104°F temperatures.
I now have a 16.5 CFM fan powered from Drive bay #3's SATA - this fan cools my Northbridge.
in 2018, prior to installing the SATA powered fan my Northbridge
was running at 75° ~ 85°C / 167° ~ 185° F in Summer. I don't know where you live but I think that the above higher temps are excessive and just heating up the whole area around the Northbridge
Since August 2019 ( peak summer here ) my Northbridge has maintained - at idle - 56° ~ 59°C. / 132.8 ~138°F - under sustained stress.
I not only regard this Northbridge SATA powered fan as neccessary but absolutely essential in Japan's summer.
Perhaps this thread
https://forums.macrumors.com/thread...mp-reduction-in-dual-cpu-cmp-4-1-5-1.2179729/ may elucidate for you precisely what I am getting at.
I assure you that I have given "cooling the Northbridge" a great deal of time and experimentation and refinement, I regard this project a resounding success.
PS : On the hottest days I
DO use Macs Fan Control very moderately.
Summary : The combination of a high CFM fan along with mild CPU fan speed adjustments is a workable compromise in reducing the cMP Northbridge temperatures. A thorough de-dusting of the cFM case - including the 'cheesegrater case holes also yields real case temp reductions.