ASRock Motherboard (Z390 PRO4)

I ordered this from Amazon Warehouse where it indicated the item was used and bonus material was missing.What I received was a brand new motherboard with all bonus material included in a distressed box.So consider this an Amazon Warehouse hit.These ship with BIOS 4.40 (newest is 4.5 as of this review), but the BIOS is new enough to support all 8th and 9th gen CPUs up to the 9900ks and 9100F.This is a basic board with slightly below average VRMs. I tried a 9900k in it that is known to hold 5.2 no problem in another board, but this board stalled at 4.9 before the VRMs overheated at 1.3v. But that wasn't why I bought it. It is a lower tier board really not meant for major overclocking and higher voltages. I tested a 9900ks I have which runs at 5ghz @ ~1.2v no problem and it handled it just fine.My build was with a 9100f which this board could handle very easy.Installation was straight forward. I paired it with a set of Corsair Vengeance LPX 3200 XMP memory (2x8GB), and it worked instantly and flawlessly and passed an overnight memtest run no problem.A few cons:No RGB headerOnly one mid and top fan aux connectorNo cooling on the VRMschipset heatsink runs right up against the M.2 devices installed in the lower part of the boardOverall, for the price, (~79USD), it does what I need and built out just fine and passed all stress tests (Memtest, CB15, CB20, TimeSpy)5/5

I have used four Asrock Pro4 motherboards in the last several years: Z390, Z390M, and two Z370M boards. All of them are working great and they even supported nice overclocks. This Z390 Pro4 comes with two M.2 ports and another M.2 for WiFi which is very good for the price. It has 10-phase VRM which is good enough for decent overclocking. My I7 9700K is running at 5Ghz on all cores completely stable and cool with a 240mm AIO water cooler. Installation was very easy and with 4x8GB DDR4 RAM, GTX 1080Ti, 970 EVO 1TB, and 960 EVO 250G, Intel AC 9260 WiFi/bluetooth. Windows 10 and Ubuntu 20.04 both work without any problems together with overclocking. I don't expect anything better.

Good motherboard, i replaced a z370 for a z390 because my previous one broke. I currently have a i7 8700k and a 2070 super to go with this and works very well.

I bought 2 of these. Processors were Intel i7-9700F NOTE: the "F" at the end means the processor has no on-board video and you MUST have a video card - if the board video output doesn't work, check your processor model!!! The first went together great and booted right up from the USB stick. I treated myself to an Intel Optane SSD and can confirm that the ULTRA M.2 on this board is ludicrously fast - loading screens on video games flash for a split second. A cold boot takes a second or two after the BIOS screen. This board is super-fast with Optane in ULTRA M.2.The second one didn't come up at all. Fans turned on but no beeps or anything. I completely took apart the first machine and put the 2nd board into it, and the first machine didn't work. When I put the 1st board into the 2nd computer, it suddenly sprang to life. Verified: definitely a bad board. Quick replacement from Amazon, saved the stars.5 stars for a low-cost, full-featured board that supports Optane very well. Subtract one star for the DOA board.EDIT: Replacement arrived. Dropped it into the chassis, plugged everything in, and it booted right up. 2 of 3 worked great.