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i have 4x PM983 960gb with a pcie x16 quad m.2 card

you sound like you don't have any clue how that works. just define a custom fan curve in whatever you use to control the fan speed. for example in the bmc fan control utility ... there you should be able to limit the maximum pwm percentage. well, then you need a better connector - crimp...

Why should any sane person undervolt a PWM Fan? just lower the pwm frequency

They are discussing 4k rpm and 8k rpm 120mm fans that are 38mm thick - noctua has no comparable products

try a custom loop with 80mm thick radiators and arctic 8k fans, that should improve cooling. or if noise is important, get a few mora iv (https://geizhals.eu/watercool-mo-ra-iv-600-schwarz-26600-a3236632.html), you can mount 9x200mm fans on these

Well, here i was wrong: With BIOS 1.2 or above there is bifurcation support

AFAIK its the latter

These work with all cases that support µATX and bigger.

you either use the original low-profile bracket of the network card (that somewhat fits on the normal full-height slot) or 3D print a custom bracket.

There are also some chinese passive risers that convert an x16 slot (full height) to an x8 slot (low profile) and two m.2 slots - with these, you have to set the slot to x8/x4/x4 bifurcation. They have mixed reviews, i have one in my test rig that seems to work reliable (used sporadically, not...

If i recall correctly, the B650D4U just died after a few months. Difference: position of the x1 and the x4 slot is switched. Normally, these boards use open ended x4 slots, so you could put in x8 cards - but on the product photo of the D4U3, the slot looks like a closed one (which sucks).

Both are using a 650E, as the only difference is PCIe 5 on the x16 Slot - Supermicro just forgot to put the E there. Both boards have (nearly) the exact same amount of PCIe-lanes (The asrock one has one pcie x1 slot more). The Supermicro has two mechanical x16 Slots. If only the first is...

On Gigabyte MC12-LE0 and ASRock Rack X570D4U you cann access a lot of supressed BIOS options with the redfish API. If Supermicro supports the Redfish API, you could try it.

So for power consumption comparison, i looked up my setups and power consumption statistics: Server: PSU: HDPLEX 500W GaN PSU MB: ASRock Rack X570D4U CPU: AMD Ryzen Pro 7 5750G RAM: 4x32GB DDR4 ECC UDIMM @ 2666 MHz LAN: 2x SFP28 Intel XXV710-DA2 SSD: 2x m.2 16GB Intel Optane...

If you think that a MC12-LE0 is "pretty power hungry" and a Gigabyte MC13-LE3 is "expensive af", then you should give us exact numbers to work with. Also, the MC13-LE3 costs about 250€ more than the -LE0, with the main difference being an onboard SFP28 controller. My X570D4U-based Server idles...

I own two different AM4 "Server" mainboards (ASRock Rack X570D4U, Gigabyte MC12-LE0) that should tick all of your requirements (depending on your definition of affordable and as low power as possible). Both are capable of Re-Bar and SR-IOV. The newer AM5 versions also support more than 128 GB...

Nice to know, i was considering a Core Ultra for an upgrade - now i have to do some research.

Why limit yourself to a Xeon? On a mainboard with a W680 or W880 chipset you get ECC support on "normal" Intel core CPUs.

You could use a ASRock Rack W880D4ID-2Q or W880D4U-2L2Q with an Intel Core 2 Ultra 235/245/265 CPU. Then you have dual 25GbE Ethernet with ASPM support, low idle power, up to 256 GB ECC RAM and you can connect up to 9 nvme-drives.

Try to get a ASMedia ASM2824 based card, this should support ASPM.