ASRock B850M Pro-A VS Asus Prime B850M-A

At the platform level, the ASRock B850M Pro-A and the Asus Prime B850M-A are virtually identical twins: both use the AM5 socket with a B850 chipset, share the same Micro-ATX form factor and exact 244 × 244 mm footprint, output video over HDMI 2.1, support overclocking, carry a dual BIOS, and come with a 3-year warranty. Neither board includes Wi-Fi, Bluetooth, integrated graphics, or an integrated CPU, so buyers planning a wireless build will need to budget for an add-in card or a Wi-Fi-capable CPU cooler bracket on both options equally.

The single concrete differentiator in this spec group is RGB lighting: the Asus Prime B850M-A includes it, while the ASRock does not. In practical terms this matters primarily for aesthetics — if you are building inside a windowed case and want addressable lighting without buying separate RGB strips, the Asus saves you that extra step and cost. Conversely, builders who prefer a clean, understated look or are building in a non-windowed case will find no penalty in the ASRock's omission.

Based strictly on the general specs provided, neither board holds a performance or feature advantage — they are functionally equivalent at the platform and connectivity level. The Asus Prime B850M-A earns a narrow edge for users who value out-of-the-box RGB aesthetics, while the ASRock B850M Pro-A is the natural pick for those who want to avoid RGB entirely, assuming pricing is comparable.

Both the ASRock B850M Pro-A and Asus Prime B850M-A motherboards offer identical memory specifications. They both support a maximum memory amount of 256GB and feature 4 memory slots. Each motherboard supports DDR5 memory, with a maximum overclocked RAM speed of 8000 MHz, and both have 2 memory channels. Additionally, neither motherboard supports ECC memory.

As the specifications for these two boards are exactly the same in this category, there is no distinction between them in terms of memory capacity, speed, or configuration.

The ASRock B850M Pro-A and Asus Prime B850M-A have several similarities and differences when it comes to their ports. Both motherboards feature four USB 2.0 ports and one RJ45 port for network connectivity. Additionally, both include an HDMI output for video, with the ASRock board offering a DisplayPort output, while the Asus board provides two DisplayPort outputs.

In terms of USB ports, the ASRock B850M Pro-A offers one USB 3.2 Gen 2 port (USB-A), two USB 3.2 Gen 1 ports (USB-A), and one USB 3.2 Gen 2 port (USB-C). The Asus Prime B850M-A, on the other hand, has two USB 3.2 Gen 2 ports (USB-A) and two USB 3.2 Gen 1 ports (USB-A), but lacks any USB 3.2 Gen 2 ports in USB-C form. The ASRock model also has a USB Type-C port, while the Asus board does not.

Both boards lack support for Thunderbolt 3 or 4, USB 4 40Gbps or 20Gbps ports, eSATA, DVI outputs, or VGA connectors, and neither includes PS/2 ports. The ASRock B850M Pro-A has a slight edge with the inclusion of a USB Type-C port, while the Asus Prime B850M-A offers two DisplayPort outputs, which might be beneficial for users needing more display connectivity.

The ASRock B850M Pro-A and Asus Prime B850M-A motherboards are quite similar when it comes to connectors, though there are a few differences. Both boards provide four SATA 3 connectors and five fan headers, ensuring adequate connectivity for storage and cooling options. They also both include three M.2 sockets, along with a TPM connector for enhanced security features. Neither board offers U.2 sockets or an mSATA connector, and both lack SATA 2 connectors.

When it comes to expansion ports, the ASRock B850M Pro-A provides more USB 3.2 Gen 1 and USB 3.0 ports through expansion than the Asus Prime B850M-A. Specifically, the ASRock board has four USB 3.2 Gen 1 ports and four USB 3.0 ports, compared to the Asus board's two USB 3.2 Gen 1 ports and two USB 3.0 ports. Both boards have four USB 2.0 ports through expansion.

Overall, the ASRock B850M Pro-A offers more expansion options for USB 3.2 Gen 1 and USB 3.0, while the Asus Prime B850M-A has fewer such options but is otherwise very similar in terms of connectors and configuration.

The ASRock B850M Pro-A and Asus Prime B850M-A motherboards differ slightly when it comes to expansion slots. The ASRock B850M Pro-A includes one PCIe 5.0 x16 slot and one PCIe x4 slot. It does not have any PCIe 4.0 x16, PCIe 3.0 x16, or PCIe x8 slots, and it also lacks PCI slots.

In contrast, the Asus Prime B850M-A includes one PCIe 4.0 x16 slot, one PCIe 5.0 x16 slot, and no PCIe x4 slots. It also does not have PCIe 3.0 x16 or PCIe x8 slots, nor does it feature any PCI slots.

While both boards offer a PCIe 5.0 x16 slot, the ASRock B850M Pro-A has a PCIe x4 slot not found on the Asus Prime B850M-A. Meanwhile, the Asus board provides a PCIe 4.0 x16 slot that the ASRock board lacks. Both motherboards do not include PCI slots or lower PCIe versions.

Both the ASRock B850M Pro-A and Asus Prime B850M-A motherboards offer identical audio specifications. They both support 7.1 audio channels, providing a rich audio experience. Neither motherboard includes an S/PDIF Out port, and both feature three audio connectors for additional audio device connectivity.

As there are no differences in the audio specifications between these two models, they are equal in terms of their audio capabilities.

Both the ASRock B850M Pro-A and Asus Prime B850M-A motherboards support RAID 1 and RAID 10 (1+0), offering solid options for data redundancy and performance. Neither board supports RAID 0+1. However, there is a difference when it comes to RAID 5: the ASRock B850M Pro-A does not support RAID 5, while the Asus Prime B850M-A does. Both motherboards support RAID 0, allowing for faster data access through striping.

In terms of RAID configurations, the key difference is the addition of RAID 5 support on the Asus board, which provides more flexibility in terms of data protection compared to the ASRock model.