ASRock B450M PRO4 R2.0 vs ASUS M5A99FX PRO R2.0 Motherboard Comparison

ASRock B450M PRO4 R2.0 and ASUS M5A99FX PRO R2.0 are both motherboards with the same PCI-Express x1 Slots (1), RAM Slots (4) and Onboard USB 3.2 Gen 1 (1). The main differences are in Socket, Form factor, Chipset and Supported Memory.

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ASRock B450M PRO4 R2.0	ASUS M5A99FX PRO R2.0
Prices (Change region) In Stock Free shipping $125.88 - Buy now	Prices (Change region) Out of Stock Free shipping $178.00 - Buy now
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Pangoly Score (How do we rate?) -	Pangoly Score (How do we rate?) 86
Brand ASRock	Brand ASUS
Model B450M PRO4 R2.0	Model M5A99FX PRO R2.0 M5A99FX-PRO-R2
Release Date 📅 April 2022	Release Date 📅 December 2012
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews ★★★★★ (465 reviews) Add a product review
Price history View Details ►	Price history View Details ►
Compatible PC parts Processors ► Memory ► Cases ► CPU Coolers ►	Compatible PC parts Processors ► Memory ► Cases ► CPU Coolers ►
Pros -	Pros Overclocking features Supports NVIDIA Quad-GPU SLI Supports AMD Quad-GPU CrossFireX
Series -	Series
Socket AM4	Socket AM3+
Form factor Micro ATX	Form factor ATX
Chipset AMD B450	Chipset AMD 990FX
Supported Memory DDR4 2133Mhz 2400Mhz 2666Mhz 2933Mhz 3200Mhz	Supported Memory DDR3 1066Mhz 1333Mhz 1600Mhz 1866Mhz 2133Mhz
* High clock speeds may require enabling the XMP profile in the motherboard BIOS ** RAM support may also depend on the CPU memory controller
ECC RAM Support No	ECC RAM Support No
Audio Chipset Realtek ALC892/897	Audio Chipset Realtek ALC892
Audio Channels 7.1 CH HD Audio with Content Protection Supports Surge Protection	Audio Channels 8 Channels
LAN Chipset Realtek RTL8111H	LAN Chipset Realtek 8111F
Max LAN Speed 1Gbps	Max LAN Speed 10/100/1000Mbps
SLI Support No	SLI Support Yes
CrossFire Support Yes	CrossFire Support Yes
RAID Support Yes	RAID Support No
Back Connect No	Back Connect No
Back I/O Ports 1 x PS/2 Mouse/Keyboard Port 1 x D-Sub Port 1 x DVI-D Port 1 x HDMI Port 2 x USB 2.0 Ports (Supports ESD Protection) 1 x USB 3.2 Gen2 Type-A Port (10Gb/s) (Supports ESD Protection) 1 x USB 3.2 Gen2 Type-C Port (10Gb/s) (Supports ESD Protection) 4 x USB 3.2 Gen1 Ports (Supports ESD Protection) 1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED LED) HD Audio Jacks: Line in / Front Speaker / Microphone	Back I/O Ports -
Wireless LAN No	Wireless LAN No
PCI-Express x16 Slots 2	PCI-Express x16 Slots 4
PCI-Express x4 Slots 0	PCI-Express x4 Slots 0
PCI-Express x1 Slots 1	PCI-Express x1 Slots 1
SATA 6 Gbps Ports 4	SATA 6 Gbps Ports 7
SATA Express Ports 0	SATA Express Ports 0
M.2 Ports 2	M.2 Ports 0
M.2 Devices support 2242 / 2260 / 2280 - M Key 2230 / 2242 / 2260 / 2280 - M Key	M.2 Devices support -
RAM Slots 4	RAM Slots 4
Maximum Supported RAM 128 GB	Maximum Supported RAM 32 GB
Onboard USB 2.0 2	Onboard USB 2.0 3
Onboard USB 3.2 Gen 1 1	Onboard USB 3.2 Gen 1 1
Onboard USB 3.2 Gen 2 0	Onboard USB 3.2 Gen 2 0
Onboard USB 3.2 Gen 2x2 0	Onboard USB 3.2 Gen 2x2 0