Another rack-PC put together this week. Intel X99-chipset with LGA2011-3 CPU socket. Only PCI-e slots, no legacy PCI-slots.
Again I didn't get the polarity of the HDD-LED and Power-LED wires right on the first try. How come the industry cannot agree on a standard connector for the bundle that has the power-switch, reset-switch, HDD-LED, and Power-LED?
Another glitch was that this board has 8 slots for RAM, and the two RAM-sticks I got need to be installed exactly in the right slots - otherwise it won't even boot into the BIOS. Some reading of the motherboard manual was required.
After installing Ubuntu 14.04LTS (from USB-stick! No CD/DVD required) the NVIDIA-drivers (for the GTX750TI) were not automatically detected. I downloaded the latest driver from NVIDIA and installed it manually. This requires logging in to a text-only console (CTRL-ALT-F1), and then killing X for the duration of the install (sudo service lightdm stop)