ASRock B365M Pro4

Visual inspection

The ASRock B365M Pro4 is nearly identical in design with the ASRock B365 Pro4, both sharing the same PCB graphics and heatsink color & shape. The B365M Pro4 uses a black and white color combination with a stripe design printed on the PCB surface and integrated into both the VRM and chipset heatsinks. The dimensions of this motherboard are: 24.4 cm x 22.9 cm.


The VRM used on the B365M Pro4 uses an 8 Phase Power design which is most likely running in a 6 + 2 configuration. Six(6) phases for the CPU and two(2) phases for the memory. The main VRM components are manufactured by SinoPower and are the SM4337 on the high side and the SM4336 on the low side. The PWM controller used is made by UPI semiconductor and is the model: uP9521P.


The capacitors are manufactured by a company that is still unknown to me, based on the logo printed on the capacitors. This type of capacitors has been used before on numerous motherboards with good results.

Edit: It appears that these capacitors are manufactured by APAQ TECHNOLOGY, a Taiwanese company that specializes in manufacturing of polymer capacitors. 



The power delivery on the CPU side is done through a single 8 Pin connector which has the locking notch, on the upper side.


The VRM cooling consists of a single metal heatsink that is mounted over the main VRM components. As many other motherboards, this type of VRM cooling is not enough and when testing the board with a 9900K, the VRM would throttle the CPU.


The B365M Pro4 offers a total of five(5) 4-pin fan headers that can be controlled through the Bios or with dedicated software. Starting at the top of the motherboard, there is a single fan header on the upper right corner of the CPU socket, with the next header located on the right, above the RAM DIMM slots. The next fan header is found on the upper left corner of the top M.2 socket. The last two headers are found on the lower edge of the motherboard, right next to the internal USB headers.


The B365M Pro4 has four DIMM memory slots which support a maximum memory capacity of 64GB DDR4. The supported frequency starts at 2133MHz.


The availability of USB 3.0 headers is down to a single header. This is mostly because of lack of space on the PCB, and also because in this price range, a single internal USB 3.0 header is common to see.


There are plenty of RGB options available on the B365M Pro4, in the shape of three RGB headers. Two of these are the standard 4 Pin RGB headers, while the last one is a newer 4 Pin design, that is compatible with addressable RGB devices and systems.


In terms of fast storage options, the B365M Pro4 has two Ultra M.2 sockets available, one being covered by a metallic heatsink for passively cooling the SSD once installed.


The regular storage is composed out of a total of six (6) SATA ports that are divided into two locations, to make the cable management easier. The four main SATA ports are found in the standard location, on the right edge of the motherboard, while the last two SATA ports are located on the lower right corner of the motherboard.


The motherboard has no integrated Wi-Fi from the factory; however, it offers a dedicated M.2 socket that is called “E-Key”. This socket offers the possibility of installing a dedicated Wi-fi or Bluetooth network card, and thus, the user has the choice of what network card to use.


The B365M Pro4 has two PCI Express 3.0 x16 slots and a single PCI Express 3.0 x1 slot. On the top PCI Express 3.0 x16 slot is reinforced with metal, the others are manufactured from hard plastic. The metal reinforcement feature has often been advertised as reducing the risk of the PCI Express slot being damaged by the movement of a heavy graphics card, but it is often used as a design element.


The Bios uses a single 128Mb AMI UEFI bios chip, which is found next to the case power and reset headers, and above the two SATA slots, on the lower right corner.


The management of the motherboard is done by a SuperI/O chip, in this case, manufactured by Nuvoton, with the model number: NCT6701D. This SuperI/O chip is placed above the Bios battery and under the second Ultra M.2 socket.


The audio system has as its main feature, the usage and integration of ELNA made capacitors, five (5) of them in total. The center piece of the audio system is the Realtek ALC892 audio chipset. The final filtering is achieved through the classic line that separates the audio components from the rest of the PCB.


On the backside, we have the I/O panel.
The I/O panel is as follows (from left to right):
– 1x PS/2 Mouse/Keyboard Port
– 1x D-Sub Port
– 1x DVI-D Port
– 1x HDMI Port
– 2x USB 2.0 Ports
– 1x USB 3.1 Gen1 Type-C Port (Supports ESD Protection)
– 4x USB 3.1 Gen1 Ports (Supports ESD Protection)
– 1x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED LED)
– HD Audio Jacks: Line in / Front Speaker / Microphone

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