I have it for a week, so I can't talk about build quality yet. I pair it with a Ryzen 5 5600G, Gskill Ripjaws 3200 16GB (2 dimm), and a GTX 1050 Ti 4GB for light gaming and everyday use.

+ I received the R 2.0 version with the latest BIOS (v5.40) already installed, which is very important since I didn't need to take it to a technician to update the BIOS to recognize the 5600G (I didn't have an older AM4 processor to do the update).
+ It loaded the XMP profile 3200mhz of the RAM without any issues.
+ Low temperatures even under full load.
+ BIOS where you can customize almost everything.
+ The onboard sound is surprisingly good. I was used to a separate pci sound card that, combined with a 7.1 sound system, provided excellent sound (I had to remove it due to incompatibility). The onboard sound of the previous motherboard I had was terrible, with very muffled and low-quality audio. I expected similar performance from this one, but I was proven wrong. For onboard, it has high performance. Of course, don't expect miracles. It handles up to 24bit 48khz just fine. If you increase it to 192, it crackles during video game cutscenes.

- The placement of the SATA ports is simply tragic (only 4 ports). They are located on the side instead of facing upwards, and they are very close together, making it impossible to connect two cables with clips in the same pair. I had to buy SATA cables without clips to connect the hard drives without risking damage. They fit fine in the previous motherboard.
- A couple more USB ports would have been helpful, but in a micro-ATX, you can't have it all.

I combined it with a Ryzen 5 2600 processor and G.Skill Ripjaws memory (4 dimm 16Gb). The old SSD 850 pro disk with Linux Mint 18.3 pre-installed from the previous system. The motherboard has BIOS-UEFI version 3.90. I didn't have any compatibility issues with the system. The memory is recognized by default at 2133Mhz, but if you overclock it with XMP, it goes up to 3200Mhz. Personally, I don't need the overclocking and I set them back to the original settings. The temperatures are very low and the noise from the fan is minimal compared to the INTEL 775 fan I had before. I was impressed by the low temperature of the northbridge, which was always a problem with Gigabyte motherboards. The processor temperature after several hours of use and with the fan is around 43°C - 44°C with a room temperature of 27°C. There is no fan in the case except for the power supply. When installing it in my old case (with the power supply on top), I had no problems with the screws. I encountered two minor issues that were easily overcome. The first one has to do with the installation of the CPU fan. The AMD logo protrudes by about a centimeter and needs to be oriented towards the back of the case, otherwise it covers the first dimm slot of the memory. The second issue has to do with the SATA connectors, which are positioned sideways and behind the disk carriers, making it necessary to remove the back of the case to add SATA devices. I had to leave a spare cable plugged into a port. The BIOS doesn't load particularly fast, but it may be due to the graphics card and settings. On the other hand, the operating system starts in barely 1 second until the password prompt and 1 second for the rest. The system sees the processor running at 1.5Ghz and depending on the current demands, it goes up to 2.8Ghz and 3.4Ghz. The processor works very smoothly and I see it as a positive that all 12 cores are utilized. The usual operating percentages are in the single digits. The sound chipset was recognized normally by the operating system and works flawlessly with the Pulse equalizer. You can run multiple applications simultaneously without any freezing. It is exactly what I wanted for the money I wanted to spend.

I have it here for 18 months.
It is paired with an r5 1600 and 2400mhz cl15 RAM (4 sticks, 2 kits, combined seamlessly).
Through overclocking, it achieves:
CPU: [email protected] - [email protected] [email protected]
RAM: 2666mhz cl16 @1.3v (it doesn't reach 2800 no matter what I do, my kit was 2400, so the motherboard is fair).
The card is not powered by the PCIe port (e.g. gtx1050ti), nor do I have integrated graphics.
For those with integrated graphics, it is preferable to use digital outputs when possible (not VGA). I have a cheaper ASRock B350 motherboard with an APU and have no issues with the outputs, not even VGA.
The BIOS is good, I would like a slightly better explanation of the technical terms it has in the advanced settings, but regardless, you don't often resort to such settings. Specifically, I had a little trouble finding how to enable CPU virtualization for Bluestacks, took me 5-10 minutes of searching on the internet.
The VRMs cool well, the maximum reported temperature in HW monitoring was 70C, other motherboards reach much higher temperatures. For VRMs, anything below 90 is okay, but above 100 you have some issues.
If I upgrade to an 8-core, I will update

First time I build a system and I have to say the following:
A great motherboard, everything you expect to see in a budget motherboard. Now, regarding the bios, which many people in the comments say is not good, I have to say that it is quite decent and comprehensive. Now, if someone wants to have frills and fancy features in the bios or wants the bios to hold their hand to the point of absurdity in order to consider it good, sorry but they should probably be in a daycare center and not criticizing such a motherboard. The system I built is as follows:
Motherboard: Asrock B450M-Pro4
CPU: AMD R5 1600 3.2Ghz
RAM: 2dimm Kingston HyperX Predator 8GB DDR4-3000MHz (HX430C15PB3/8) (meaning a total of 16GB)
GPU: MSI GeForce GT710 1GB LP (temporarily until I install a better one, specifically the MSI GeForce GTX 1650 Super 4GB Ventus XS OC or the Gigabyte GeForce GTX 1650 Super 4GB Windforce OC)
PSU: Corsair VS 450 White
HDD: Seagate Barracuda 1TB (2.5") 5400rpm 128mb cache
Case: Aerocool QS-240
Additionally, I added a mini speaker to monitor everything in general (bios, RAM, etc.).
After setting it up and connecting everything properly, it wouldn't turn on (due to my mistake, read on to understand). Meaning, the fans would start working, then the message "No input signal" would appear on the screen, and after 20 to 30 seconds, it would shut down and the same thing would happen again. After trying various things, such as checking if the RAM slots were the issue, if the RAM was faulty (initially I had bought the G.Skill RipjawsV 16GB DDR4-3200MHz (F4-3200C16D-16GVKB) which were not on the motherboard's QVL, so I changed them to the ones mentioned above (which are on the QVL)), if the slot where I inserted the graphics card was the problem, if using the HDMI instead of the VGA from the GPU would make a difference, or if there was any loose cable. Finally, I took it to a technician who told me that I had bent all the pins of the processor when I installed it (a big mistake on my part, I didn't expect to cause such damage). Nevertheless, he fixed it and I have had the system for a week and a half now, and it works flawlessly, even with the GPU I mentioned at the beginning. The XMP on the RAM was enabled without any issues. It is important to note that I installed Windows 7 Pro x64 using Gigabyte's tool instead of Asrock's because I was having issues with it. In order to update your Windows 7 without receiving the "Unsupported Hardware" message, you need to install the "wufuc" tool (search it on Google and you will understand what I mean). Furthermore, when updating with Windows Update, make the updates one by one and NOT all at once (first ONLY the 2010 updates, reboot, then ONLY the 2011 updates, reboot, and so on until 2019). I say this because when I did it all at once, it caused my PC to reboot and go straight to startup repair, which couldn't perform auto repair and happened every time I turned on the PC. Using the Gigabyte tool on the USB stick (since the original DVD didn't work with the keyboard and mouse), I restored to the point before the updates and then, as mentioned before, I did them one by one and it worked fine, just took a bit longer. This way, you can have Windows 7 and avoid Windows 10, which has so many issues due to automatic updates, instability, security problems, etc. And if anyone disagrees, especially regarding security, I inform you that in Windows 10, having support and Defender doesn't save you from anything, and in Windows 7, now that support is ending, I have already installed Kaspersky Internet Security Free (a well-known and top antivirus) and I plan to get a license to be covered, so no problem.
Edit: I forgot to mention that my motherboard came with BIOS version 3.60 and it works fine with the R5 1600 (I don't know why Asrock says it's not recommended to update the BIOS with the summit CPU, which is the R5 1600, meaning mine). The RAM at 3000MHz (to be precise, 2933MHz) gave me bluescreens. I set them to auto, which is 2400MHz, and they work fine. I have now set them to 2667MHz and I will update you later.
Edit2: Finally, the RAM at 2667MHz works fine, so it is also the maximum I can consistently use (after all, according to AMD, the R5 1600 supports RAM up to 2667MHz, so it's logical for this to happen).

In these money offers everything, to a satisfactory degree, if we are talking about everyday use without overclocking.

+It has heatsinks on the VRMs, which do not exceed 45-50 degrees (with an infrared thermometer), something that is not easily found anymore. For example, the Gigabyte B450 is a toaster.
+It has as many ports as one might need, the type-C is missing.
+Without overclocking, it works flawlessly.
+2 m.2 slots (Attention! You cannot use 2 NVMEs simultaneously)

Now for the negatives.
-I paired it with Ryzen 2600 and 2700. Neither of them went above 4.0GHz stable.
-With 16GB Gskill Ripjaws 3200Mhz-cl15 bdies (the best available), the XMP profile crashes. I manually managed to get them to 3400cl16 with 1.4V. The same RAM on an MSI X470 for 100 euros reached 3600cl15.
-The Asrock BIOS is downright terrible. Fast boot never worked, fan settings only apply after a restart, and sometimes it doesn't detect the m.2 NVME.

For 70 euros, I believe you get what you pay for, I didn't have high expectations. Overall, if I were to buy again, I would go for the K5 or Tomahawk from MSI.

Some say they had issues. I didn't have any.

edit:
I was using 2x4gb Patriot viper RAM in slots A2 and B2.
I added 2x8gb gskill aegis RAM in slots A1 and B1.
XMP couldn't run them at 3000 MHz. It would only run at 2133 MHz, the default speed. I should also mention that both RAMs are 3000 MHz but with different timings.
I tried 4x8 gskill aegis RAM but XMP still didn't work. I was ready to give up until I tried putting the 2x8 gskill RAM in slots A2 and B2 and the 2x4gb viper RAM in slots A1 and B1. I enabled XMP and they started running at 3000 MHz!!!! Of course, the motherboard's manual clearly states that if all 4 slots are in use, it can handle 2933 MHz, so I set them to 2933. I ran a stress test for 3 hours and they held up.
Everything else works perfectly on the motherboard, I overclocked the 2600 to 4.00 GHz. All is fine. In conclusion, I don't understand why XMP didn't work in the initial positions or even when I used the same RAM. The problem, as I mentioned, was solved and everything is running smoothly.

Good evening everyone! I have been using this motherboard for about two months now, for everyday use from 5 to 13 hours, with countless settings and tests.... AMD Ryzen 5 2400G Vega 11, 2x8GB Corsair 3200Hz, Thermaltake 550 RGB, and it works perfectly! I had issues with blue screens because I installed newer LAN drivers, but it's definitely not the motherboard's fault! My advice is that since Windows now protect your hardware with blue screens for almost everything, in order to avoid issues with blue screens, download the drivers recommended by the motherboard from the motherboard's website ONLY! I found the solution for the blue screens the day before yesterday, after dealing with this problem for two months, and I mention it because some people might have issues with AM4 sockets.... To keep it short, the motherboard supports overclocking (I have tried countless combinations of Hz and volts on RAM, GPU, and CPU) and it hasn't let me down! It is small, beautiful, with 4 RAM slots and many ports! The only negative, if you want to call it that, is that I would have liked it to have a DisplayPort port, which is supported by specific monitors, but that's a minor flaw, I just mention it.. I don't think it's just a budget option, you can invest in it, it's moderate in terms of its price, there are cheaper options, so yes, I would recommend it!

Excellent choice for Ryzen at a very good price.
Combined with R5-1600 and 2x4 Hyperx/2133 from my previous skylake system.
It came with BIOS version 1.60 which is ok for me, but for 2200g-2400g an upgrade will be needed.
I put the RAM in slots a2-b2 and with OC through the BIOS, they run steadily at 2933/16-16-16-37 (couldn't go higher) with 1.30v, so for now I saved myself from buying new ones, although it seems difficult (from reviews) for them to work in 4x4gb with OC, so it's better to go for 2x8gb/2933+ if you want 16gb.
I downloaded the A-Tuning application from the Asrock website and through there I overclocked the CPU to 3.75ghz with 1.325v, where it runs steadily and even lowers the frequency to 1.55ghz on any core that is not under load. It can go higher, but without this feature. Of course, every CPU behaves differently, I just mention it as an option for OC.
In terms of temperatures, it's perfect even with OC.
If you enable the ultra fast boot option from the BIOS, it boots in no time, but you need to download the restart to uefi application to go back to the BIOS.
Recommended for budget situations.

It seems strange to me that despite seeing so many good reviews, my own experience is quite frustrating. Initially, the combination of components:

- CPU: Ryzen 5 2400G
- RAM: 2x G.Skill AEGIS 8GB 3000MHz
- MOBO: ASRock B450M Pro4
- PSU: Thermaltake Smart SE 530W

To be clear, I haven't encountered many major issues (e.g. it generally doesn't POST, crashes randomly). However, I have experienced some other equally annoying problems:
- Every time the PC boots and reaches the Windows login screen, the monitor displays white/RGB snow on the entire image for 2-4 seconds, and then displays normally. The snow/parasites do not appear anywhere else, only during the login screen on boot. I have installed the latest video drivers for the APU, but even with older ones, the same issue occurs.
- Huge issue with the WiFi PCI-E network card (TP-LINK TL-WN881ND) as well as various USB WiFi adapters. They simply refuse to work properly when plugged directly into the MOBO, either timing out or not connecting to any network. As soon as I connect the adapters to an external USB hub, they work perfectly. The PCI-E card can't even reach speeds of 10 Mb/s (despite having antennas), while the USB adapter (when working through the USB hub) reaches 35 Mb/s - same access point and same distance. Even more strange is the fact that other USB devices such as mice/keyboards/external drives work correctly with the MOBO.
- It has issues with some options in the BIOS. Specifically, it doesn't allow me to allocate more than 3GB VRAM to the APU. The option for more VRAM exists, but as soon as it enters Windows, the APU defaults back to 2GB. The option used to work fine before installing the APU drivers recommended by ASRock, but even after uninstalling them, reinstalling Windows, and trying different BIOS versions, the option is still broken. Another dysfunctional option I noticed is the CPU and CASE fan profiles. If I switch from Standard to Performance mode, the PC won't POST and I have to remove the CMOS battery to go back to defaults.

I have tried countless installations/uninstallations of the APU driver, PCI-E WiFi card driver, USB adapters, BIOS upgrades/downgrades, different RAM, different power supply, changing RAM slots, booting with only one stick, Windows reinstallation, etc. No solutions have been found, and with every new attempt, the situation seems to worsen. The only positive thing I can find is that at least the basics are functioning and I have a working PC.

I don't know if I received a faulty component or not, but either way, I wouldn't recommend it. If there are any changes in my situation, I will update the review.