Thank you very much for the thorough update. It's beyond amazing how thorough you are; mythical, legendary even

As to me; I'm running (1x 9100 Gen 5 , 4TB) + (2x 990 Pro Gen4, 4TB ) in RAID 0 configuration, and set as storage space (drive D

.
I'm employing a WD-Black SN850X (8 TB) as the OS.
View attachment 202423
As for drive speeds on the "MSI SUPER RAID 0" ... I'm getting close to and around 12000 mbps. I'm a little disappointed, but, marketing gets all of us some of the time.
For drive temps I'm using 1mm and 0.5 mm Arctic TP-3 pads. They were cheap and abundant, but, seem to have an okay rating. They're not the best of the best, but, they'll do the job, I hope.
The 990 Pro SSDs hae a low point half the length of the drive that's about 0.5mm. I don't have precision calipers to measure it, but I read somewhere that it was a 0.5 difference between each half lengthwise. Because of this, I applied 0.5mm Arctic TP-3 pads on the low points, then stacked a 1mm Artic TP-3 along the entire length of each SSD
I don't recall if the 9100 had a low point, but, if it did, it would have gotten the same treatment and on the heat pipe, I removed the OEM pads, and replaced the smaller one with Arctic TP-3 pad 05mm.
For heat sinks, I ordered an assortment of varying heights. I even have some very similar or the same as yours, BUT, I opted to appoint a heatsink that's 3mm tall, and they fit.
Here's the Amazon Link for the heatsinks I'm using:
https://www.amazon.com/dp/B0CR69GG3W?ref=ppx_yo2ov_dt_b_fed_asin_title
I hope that link works, but, if not, the seller or brand is ELUTENG.
I chose these because the vertical fins were higher, which translates in my little brain to more surface area, and better cooling.
These heatsinks are resident on the 3 Gen 4 SSDs.
Lastly, the whole kit sits on a Llano big single fan cooler.
Below are the temps I'm getting, but, none of that is under any load stress.
View attachment 202426
I'm still working on migrating personal files, installing apps and all the time-eating labors of moving from one PC to another.
Oh, I ran the Talon app for Win 11 to debloat the OS of all the Copilot, Recall, tracking, advertisements, Xbox software, Edge, and almost everything that's annoying AF with Win 11.
This MSI Titan 18HX AI is my first hand-on with Win 11. I've been hanging on to Win 10 Pro because it's comfortable. I know it, and, I'm a little bit adverse to change. Further, I seem to encounter more disappointment and frustration around the web about Win 11, than praises, ... but, Win 10 is at end-of-life update/support-wise, so, here I am with Win 11. It'll take some adjustment.
Thank you again for reporting on all these metrics. I'm still waiting for the 2x 64GB csodimm ram, and it looks like I won't see it until around Jun 7. or a bit over a week away.