We tested all socket AM4 motherboards with an AMD Ryzen 7 1800X, 8GB Corsair Dominator memory clocked at 2666 MHz, two OCZ Arc 100 240GB SSDs and a Seasonic Prime 650W 80+ Titanium power supply. Since a standard air cooler was not always sufficient to keep the processors cool without any throttling, we used the Cooler Master MasterLiquid Lite 120. Lastly, we used the MSI GeForce GTX 1050 Ti as our graphics card.
All tests are performed using the default settings of the motherboards. Of course the performance and power consumption depend on the standard tuning. Some manufacturers use tricks in order to further increase the performance. For example, some motherboards scale up to the maximum single-core turbo on all cores. This means that the system is a lot faster, but also less power efficient.
In the graphs all X370 motherboards are red, B350 motherboards are green and A320 motherboards are grey. For a full comparison table with all specifications and test results, refer to this link.