+++ The ASRock B450M Pro4/A/ASRK motherboard is available for approx. 80 Euro (08/2018) and is therefore in the lower price range of AMD AM4 motherboards.
The ASRock B450M Pro4 AMD AM4 DDR4 motherboard offers even as Micro ATX motherboard a great basic equipment up to the fast Ultra M.2 slot and despite B450 chipset even good OC results, it is therefore overall a great board to build an inexpensive AMD Ryzen Micro-ATX PC.
As basic equipment the B450M Pro4 motherboard offers three PCI Express slots, four SATA3 ports, one fast Ultra M.2 32Gb/s slot, an additional M.2 6Gb/s slot, one USB 3.1 Gen2 Type-C, one USB 3.1 Gen2 Type-A, up to six possible USB 3.1 Gen1 ports, up to six possible USB 2.0 ports, one Gigabit LAN port, 7.1 sound with content protection, analog sound output via three jacks, four DDR4 slots, ASRock A-Tuning software for Ryzen overclocking and fan control in Windows, ASRock RGB LED lighting as well as Polychrome RGB for addressable RGB LEDs and much more.
Only with the sound one must accept slight losses, since only three jacks and no optical digital output are available – for audiophile sound card owners (e.g. Asus Xonar Essence STX II 7.1) this is naturally no problem.
All in all the ASRock B450M Pro4 motherboard offers a great basic configuration, even OC settings and control of RGB LEDs and addressable RGB LEDs. In combination with an AMD Ryzen 7 2700X CPU you can build a powerful high-end AMD Ryzen in Micro ATX package. In combination with an AMD Ryzen 5 2400G, however, the construction of a very inexpensive Micro ATX PC system is possible. And even for upgrading the AMD B450 motherboard can be used in combination with one of the previous AMD Ryzen 1000 series CPUs, because the entire PC power consumption on the ASRock B450M Pro4 with an AMD Ryzen 7 1800X CPU was about 10 watts below the ASRock X370 Taichi motherboard with AMD X370 chipset for comparison in idle.
ASRock did a great job again and AMD can also shine with the new processors. On the one hand with the fast AMD Ryzen 7 2700X and on the other hand with the inexpensive AMD Ryzen 5 2400G solution – thanks to integrated GPU (from Windows 10)!
Special thanks to ASRock for their support.
* All AMD AM4 motherboard reviews since 01.08.2018 are based on an AMD Ryzen 5 2400G processor, MSI Radeon R9 280 Twin Frozr Gaming 3GB PCI Express 3.0 video card, 2x 4GB Crucial Ballistix Sport DDR4-2400 / PC4-19200U memory modules, Cooler Master Silent Pro M 600W power supply unit and the following software configuration: Microsoft Windows 10 Pro, SiSoftware Sandra, Futuremark PCMark10 and 3DMark (OC software is available in the Links & Downloads section). All benchmark results only offer a comparison among themselves for a rough motherboard performance comparison.