Sorry for not following up for so long. I had a huge personal project to complete (moved home, work and whole family from one side to the other side of Germany), so working on the motherboards got on the waiting line.
These boards are used by an ISP in Düsseldorf. They bought a Gameserver provider a few years ago and my gut feeling is that these stuff are the left overs which are maybe stored in a low profile environment.
I double-checked it today.
There are 4 SATA3 (6Gbps) which are working at full speed (My SSD shown around 500 mb/s)
1 Sata 2 (3Gbps) which allows my SSD to run at around 250 mb/s.
And there is another Sata2 Port in the chipset, which is not electrically connected and available, but inside Linux...
If you are still wondering what the base power-consumption of this board is, then here is a low power baseline:
I used a 60 watt external power supply (12V) which connects to a 160 watt tiny-psu clone ( NEW DC-ATX-160W MINI DC-ATX Inline Power Supply Module Board 24Pin 12V 160W | eBay ).
My boards didn't boot from disks, but from PXE. So adding any drive with a bootable Linux doesn't help if you need to get into the bios first. So it is basically chicken and egg dilemma.
Easier it's of course to use the console breakout cable.
Officially the black SATA port just for DOM devices. So something like a 4gb flash on a SATA plug. Nothing speaks against using it as a standard disk connector.
Regarding the speed, I can do a few tests on it and compare it with the 4 white SATA ports.
I powered all drives over my ATX...
My second board which also didn't want to start, just required the BIOS update, as @hmartin suggested.
So finally two of my boards are working just fine. The only one which I blowed up (I am pretty sure it was my fault) is still pending.
I can also confirm @hmartin 's statement:
If the BMC...
Yes! The new board runs! Hurray!
I can confirm that the works really really fine :)
All 5 (!) SATA Ports also are working as expected.
Ensure that you have a static air flow. The parts are getting warm quickly.
Thanks everybody for the awesome support!
I will create a few...