Power efficiency and riserless motherboards

[jmigdlc99]

Anyone have any idea if it is more power efficient to run a riserless motherboard like Onda or Octominer?

I understand density is a consideration because you can put more GPUs on a 19-GPU ASUS, but let's say I only need to run 8-GPUs.

Which would be more power efficient:

A. Onda
B. Octominer
C. ASUS mining expert
D. Asrock H110+ pro

[m.vina]

Correct me if i'm wrong but I believe they are all the same in terms of power consumption? Because all boards, even though riserless, still require power to the PCIE lanes.

The Onda 1800 may be more efficient tho since i believe it uses a mobile/laptop based CPU that is built-in to the board.