Hi,
Many thanks to CaseySJ for this very detailed and precise guide. It worked perfectly for my setup which is :
Case : Fractal Design R6 - usb c (the goal being to build a very quiet pc). All three case fans connected directly to the mb and not through the provided hub. Although being 3 pins and not pwm, they are perfectly controlled by the mb.
MB : Gigabyte Z490 VISION D, of course
CPU : i5-10600k (I ordered 10700k initially, but amazon cancelled my order, the seller having sort of disappeared, so I bought what was reasonably available)
Cpu cooler : noctua NH-14s : a bit of a regret, I didn't have enough clearance for using the top pcie port for the graphic card, a sapphire pulse rx 580, so the video card went to the second pcie slot... x8 and not x16, I know, but, as I don't game, it is not a disaster I guess...
Video card : Sapphire pulse RX 580, with a DVI-D needed to drive my old but still nice screen : HP LP3065
Storage : NVME Sabrent Rocket Q, 2To on first socket (closest to cpu)
and a SATA 3To Seagate HDD.
Bluetooth and wifi : Fenvi FV-T919 which hasn't caused any problem so far (although I put it in the first pcie slot, which is a very strange choice I agree, but not much could fit there due to the cpu cooler so why not...)
RAM : 2x32gb DDR4 3200 from patriot allowing for expansion to 128gb if and when I need it... (I might...)
I didn't have much trouble following the guide. The motherboard's bios was surprisingly old (F2) so I upgraded it to the latest on gigabyte's site (not F5a or F5d, but just F5, dated from 07/15)
A little blunder, it so happens my usb stick was not bootable... I had copied the content of the EFI folder into the EFI partition instead of the EFI folder itself. (It thought it weird to have EFI/EFI/... but that's the way it is it seems)
It is too soon to be certain, but everything seems fine so far. Not a fan of benches, but here is what the stock 10600k is able to do in this configuration (everything in the bios as in the guide) :
Geekbench 5 : single-core : 1245, multiple-core : 7215
Pc is when idling near silent, and rather quiet when pushed, and cpu temp stayed quite reasonable (I am not sure intel power gadget measured it above 70°C when benchmarking, with idling temperature around 37°C), while ambiant temps are closer to 30°C than 20°C...
Thanks too for the hints about APFS volumes. It will prove very useful !