Best Motherboard for Ryzen 9 3900x of 2021: Complete Reviews With Comparisons

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For entry-level PC builders, the best processor is always one that can deliver exceptional performance at a very reasonable price.

Ranking high on our list of AMD processors is the Ryzen 9 3900x.

You may be getting it for a new PC, or you might still be fond of it coming from an older build.

Always give your CPU the chance to provide the best processing power by pairing it with a reliable motherboard.

To narrow down your search, we have compiled a shortlist from which you can choose the best motherboard for Ryzen 9 3900x.

Comparison Chart

Asus ROG Strix B550-E Gaming Motherboard

MSI MEG X570 ACE Motherboard

ASRock X570 Phantom Gaming X Motherboard

Gigabyte X570 Gaming X Motherboard

MSI MPG X570 Gaming Plus Motherboard

Best Motherboard for Ryzen 9 3900x Reviews

1. Asus ROG Strix B550-E Gaming Motherboard

For any PC enthusiast, Asus ROG does not need any introduction.

While many B550 chipset motherboards can work with the Ryzen 9 3900x processor, the Asus ROG Strix B550-E Gaming is the only one we saw fit to add to this list.

Review

The Asus ROG Strix B550-E Gaming Motherboard offers the best gaming connectivity for a B550 board.

Smooth networking prevents lags, and high-speed connections allow a hassle-free gaming experience.

  • Expansion Slots

With the Asus ROG Strix B550-E Gaming, you have several expansion options, including two PCIe 4.0 x16 slots, two PCIe 3.0 x1 slots, and one PCIe 3.0 x16 slot in x4 mode.

These expansion slots allow multi-GPU support for NVIDIA 2-Way SLI and AMD 3-Way CrossFireX technologies.

Aside from the PCIe 4.0 expansion slots, the B550 chipset does not improve much from the cheaper B450 motherboards.

  • Memory Slots

This gaming motherboard supports up to 128GB RAM with its four DDR4 DIMM slots.

Using a dual-channel memory architecture, the DIMMs support ECC Memory in ECC mode.

It is compatible with the OptiMem II.

  • Storage and Transfer Capabilities

The Asus ROG Strix B550-E Gaming Motherboard has a single M.2_1 socket 3 with an M key.

This M.2 slot supports SATA and PCIe 4.0 in x4 mode.

It also has an M.2_2 socket 3 with an M key that supports SATA and PCIe 3.0 in x4 mode.

In addition to the two M.2 sockets, the Asus ROG Strix B550-E Gaming Motherboard has six SATA 6Gbp/s ports supporting RAID 0, 1, and 10.

  • Thermal Control

The Asus ROG Strix B550-E Gaming motherboard can provide cooling through several connectors to keep things running at optimum levels.

It has a CPU fan connector, three system fan headers, one water pump connector, and a CPU OPT fan connector.

In addition to the fan connectors, this motherboard has 14+2 power stages, which means it has enough VRM to keep the processor running smoothly.

  • Connectivity

With the Intel I225-V 2.5Gb Ethernet adapter and the Asus LANGuard, the Asus ROG Strix B550-E Gaming Motherboard can keep things running smoothly on your network.

This means you’ll never have to lose a point again because of laggy connections while in-game.

This board also has a 2x2 Intel Wi-Fi 6 AX200 that supports a dual-band frequency for wireless data networks.

PROS

  • Impeccable networking capabilities
  • Durable construction
  • Extensive features
  • Excellent gaming connectivity
  • DIY-friendly design

CONS

  • Other B550 boards cost less
  • Many would go for the more affordable X570s

2. MSI MEG X570 ACE Motherboard

MSI also brings out the best in competitive gaming with the MEG X570 ACE motherboard.

It can be an excellent companion for the Ryzen 9 3900x for winning games, setting records, and outshining the competition.

Review

The MSI MEG X570 ACE is a first-class ATX motherboard designed for the latest Ryzen processors.

It is packed full of the core stuff that separates the X570 from other chipsets.

It offers many overclocking features, including an overclocking knob, that many gaming and PC builders would surely enjoy.

  • Expansion Slots

With the Ryzen 9 3900x, you can maximize the two PCIe 4.0 x16 sockets of the MSI MEG X570 ACE Motherboard.

It has another PCIe 4.0 x 16 socket that can support x4 mode for PCIe 3.0.

In addition to the x16 sockets, it also has two PCIe 4.0 x1 slots.

Like the Asus ROG Strix B550-E Gaming, the MSI MEG X570 ACE Motherboard also supports 2-Way NVIDIA SLI and 3-Way AMD CrossFire technologies.

  • Memory Slots

The MSI MEG X570 ACE Motherboard has four DDR4 DIMM slots that use a dual-channel memory architecture for a total capacity of 128GB.

These memory slots support ECC UDIMMs, but in non-ECC mode.

  • Storage and Transfer Capabilities

The MSI MEG X570 ACE Motherboard has four SATA 6Gb/s ports and two M.2 slots for storage.

The two M.2 slots allow M.2_2, and M.2_3 cards with a Key M, and they also support PCIe and SATA.

  • Thermal Control

The MEG X570 ACE allows up to five system fans, one water cooler pump, and a CPU fan.

Moreover, VRMs use a 12+2+1 IR digital power that lets all your computer components work well together.

  • Connectivity

If you are craving a lightning-fast gaming experience, the M.2 slots, PCIe 4.0, and dual LAN with the latest Wi-Fi 6 technology can help you get the job done.

The onboard 2.5G Gigabit LAN and gaming LAN manager ensure that all your games and data transfers run smoothly.

PROS

  • DIY-friendly installation and assembly
  • Excellent BIOS control
  • Multiple options for aesthetics
  • Adequate cooling headers
  • Attractive black and gold design

CONS

  • Can use additional SATA ports
  • Cannot use PCIe x1 slots simultaneously
  • Costs more than others on this list

3. ASRock X570 Phantom Gaming X Motherboard

While Asus and MSI battle it out at the top with their explosive product lineups for the best motherboards, ASRock is always nearby to join the fight.

ASRock’s Phantom Gaming X Series also puts the X570 chipset to good use with this monster of a motherboard.

Review

The ASRock X570 Phantom Gaming X motherboard ensures it delivers a wide range of features as it sits alongside the first-rate ATX motherboards.

It offers exceptional value for enthusiasts, gamers, and overclockers.

  • Expansion Options

For Ryzen Matisse CPUs like the Ryzen 9 3900x, the ASRock X570 Phantom Gaming X offers two PCIe 4.0 x16 sockets running at 16 lanes.

You also get two more 4.0 PCIe x16 sockets running at x4 and two 4.0 PCIe x1 slots.

This overabundance in expansion slots allows multi-graphics setups and supports 3-Way CrossFireX, NVIDIA Quad SLI, and NVIDIA NVLink Bridge.

In addition to the PCI Express lanes, the board has a vertical M.2 socket using Key E that comes bundled with the WiFi-802.11ax PCIe Wi-Fi module.

  • Memory Slots

Like the Strix B550-E and MEG X570 ACE, the X570 Phantom Gaming X also allows up to 128GB of RAM.

It has four DDR4 DIMM slots using a dual-channel memory technology with support for both ECC and non-ECC UDIMM.

Furthermore, the slots support XMP modules.

  • Storage and Transfer Capabilities

The X570 Phantom Gaming X is also overflowing with storage options.

It has eight SATA3 6Gbp/s sockets that support RAID 0, 1, and 10 and three M.2 slots using the M Key.

  • Thermal Control

With its heat pipe design and enlarged aluminum alloy heatsinks, system heat dissipates quite remarkably.

System coolers include a CPU fan header, a water pump fan connector, and four system fan connectors that can also supply other pumps.

  • Connectivity

The built-in Ethernet adapter is a Dragon RTL8125AG.

It uses a 2.5 Gigabit LAN with transfer speeds of 10, 100, 1000, and 2500 Mb/s.

Imagine online gaming with extremely smooth transitions from the Phantom Gaming LAN software.

The software offers an optimized gaming experience for LAN, online, and streaming modes.

Furthermore, the motherboard comes with an Intel 802.11ax Wi-Fi module with two antennas, one for transmitting and another for receiving.

The system also supports Bluetooth 5.0 so that you can transfer data at reliable speeds.

 

PROS

  • Compatible with up to 5000 Series processors
  • Remarkable cooling components
  • Jam-packed with features
  • Value-for-money beast for the Ryzen 9 3900x
  • Uses all-new USB 3.2 ports

CONS

  • May be too expensive for entry-level PC builders
  • Too many overwhelming features for the beginner

4. Gigabyte X570 Gaming X Motherboard

Until recently, there have been more Gigabyte X570 chipset boards available in the market. This list won’t be complete without an option from all of the big four.

The Gaming X motherboard is at the core of Gigabyte’s game-focused product line.

Review

Compared to the others on this list, the Gigabyte X570 Gaming X motherboard uses slightly fewer VRMs for power delivery.

The good thing about it is that it can get the most out of your Ryzen 9 3900x at a more affordable price than its competitors.

  • Expansion Options

The Gigabyte X570 Gaming X has five expansion slots, also incorporating the 4.0 version.

One 4.0 PCIe x16 slot runs at 16 lanes, another at four lanes, and three 4.0 PCIe Express slots use single lanes.

These expansion slots allow multi-graphics operation for AMD Quad-GPU CrossFire and 2-way AMD CrossFire technologies.

  • Memory Slots

The memory slots on the Gigabyte X570 Gaming X motherboard offer up to 128GB of RAM.

It uses four DDR4 DIMM sockets that support up to 32GB each.

The DIMM slots support ECC, non-ECC, and XMP modules.

  • Storage and Transfer Capabilities

The Gigabyte X570 Gaming X has a single M.2 slot, convertible to SATA or PCIe 3.0 x4 or x2.

Other than that, the board has six SATA 6Gb/s connectors with support for RAID 0, 1, and 10.

This lets you mix and match your SSDs with regular hard drives to get all the storage you need.

  • Thermal Control

Built-in cooling connectors include one for a CPU fan, one for a water pump, and two for system fans.

This number of headers is not much compared to the ASRock X570 Phantom Gaming X.

Still, it can maintain optimum temperatures for quality performance.

  • Connectivity

You can enjoy your LAN games and home network connectivity using the built-in Realtek GbE LAN chip with an RJ-45 port.

Unfortunately, the X570 Phantom Gaming X motherboard is not Wi-Fi ready.

If you need Wi-Fi, you will have to sacrifice one of those expansion slots for a Wi-Fi adapter.

Other connectors include four USB 3.2 ports, two USB 2.0 ports, two PS/2 ports for keyboards and mice, one HDMI port, and three audio jacks.

PROS

  • Supports multi-graphics even with fewer expansion slots
  • Costs lower than others on this list
  • Simple, all-black design
  • One of the cheapest boards with PCIe 4.0 expansion capabilities

CONS

  • May need better cooling options due to fewer VRMs
  • Fewer expansion options

5. MSI MPG X570 Gaming Plus Motherboard

Last but not least, we also recommend the MSI MPG X570 Gaming Plus motherboard.

If you need to settle for a board from an even lower price tier, this could be the perfect board for your Ryzen 9 3900x.

It has the same red and black design as many MSI motherboards, and it offers some RGB aesthetics while satisfying gamers with the board that they need.

Review

With the MSI MPG X570 Gaming Plus motherboard, you won’t have to worry about upgrading from the Ryzen 9 3900x.

You will love that it is forward compatible with the 5000 Series Ryzen processors.

  • Expansion Options

For expansion options, the MSI MPG X570 Gaming Plus motherboard has two PCIe 4.0 x16 slots.

The second PCIe 4.0 slot allows PCI_E3 in x4 mode.

These PCIe 4.0 x16 slots support multi-graphics using 2-Way AMD CrossFire Technology.

Additionally, you will find three PCIe 3.0 x1 slots.

  • Memory Slots

The four DDR4 DIMM slots can support up to 128GB of RAM modules, as it uses dual-channel memory architecture.

Both ECC and non-ECC UDIMMs are supported, but the ECC modules run in non-ECC mode.

  • Storage and Transfer Capabilities

All in all, the board offers four SATA 6 Gb/s ports and two M.2 Key M slots.

The M2_1 slot supports PCIe 4.0 x4, while the M2_2slotsupports PCIe 3.0 x4 connections.

The SATA ports support RAID 0, RAID 1, and RAID 10.

  • Thermal Control

With an extended and Frozr heatsink design, the MSI MPG X570 Gaming Plus motherboard offers exceptional heat dissipation.

The board has one CPU fan connector, one water pump connector, and four system fan headers.

  • Connectivity

The 2-Way AMD CrossFire Technology uses a Realtek 8111H Gigabit LAN Controller for Ethernet.

It can have up to six USB 2.0 ports, six USB 3.2 ports, audio connectors, optical S/PDIF out, HDMI.

PROS

  • Most affordable motherboard among the choices
  • Supports MSI Dragon Center app
  • 29 lighting effects using MSI Mystic Light
  • Studio-grade sound quality
  • Lightning-fast game experience

CONS

  • Multi-graphics for 2-Way AMD CrossFire Technology only

Which Motherboard Is Best for Ryzen 9 3900x?

With 12 cores and 24 threads, the Ryzen 9 3900x is an excellent mainstream processor.

You might want to hold on to it for your next PC build, or you can get it for the first time to build your first PC.

We recommend the ASRock X570 Phantom Gaming X as the best motherboard for Ryzen 9 3900x.

With this, you can expect to get the most bang for your buck.

It brings you farther ahead of competing gamers unless they have a better rig than yours.

All in all, you will surely spend countless hours gaming as a result of the impeccable gaming experience.