The 1-fan solution works beautifully the last two nights. The peak temp is same as 2 fans at 86 C at full load with Cinebench. The typical use of the PC has had.. basically no changes. The Cinebench actually has
zero difference vs the prior 200-300 drop with 1 fan. It just had a browser & game launcher messin' with the scores. The 1 fan produces the same 178xx scores. Amazing. Afterwards, I also did a quick-n-dirty undervolting of -15 CO. It looks like many nerds report they start failing at 20-30~. I just set it to -15 across the board and Cinebench now breaks 18000.
I'm finally very happy. I'm mostly very pleased with the 1-fan trick I read somewhere. It is
so quiet even under load.
I near cried when I started to see the BIOS consistently with the new motherboard (MSI -> Gigabyte). This BIOS was updated to the latest one this year.
Look at this beaut. Looking back, I'd put my money on the CPU being defective (memory controller). The problem persisted until I replaced the 7800X3D and diff mobo brand. But two diff new boards still gave me the same issue.
Notice the heatsink missing the fan that would otherwise be blocking the RAM?
Insanely cool and efficient. 7800X3D is 39-41 C idle with that 1-fan on a curve. And it's under 400 RPM! I think the modern case of mesh walls helps tremendously too (Corsair 4000d).
I give it 5 stars.
This build will really shine when I get rtx5080 or 5070ti around GTA5 release. I decided to wait upgrading my 2070 since all my current games play just fine.