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Asurion Complete Protect: One plan covers all eligible past and future purchases on Amazon

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ASUS Prime B450M-A II AMD AM4 (Ryzen 5000, 3rd/2nd/1st Gen Ryzen Micro ATX Motherboard (128GB DDR4, 4400 O.C.), NVMe, HDMI 2.0b/DVI/D-Sub, USB 3.2 2, BIOS Flashback, and Aura Sync)

4.5 4.5 out of 5 stars 5,762 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Computer Motherboards by ASUS
$69.99 with 13 percent savings
List Price: $79.99

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B450M-A II
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Purchase options and add-ons

Brand ASUS
CPU Socket Socket AM4
Compatible Devices Gaming Console, Personal Computer
RAM Memory Technology DDR4
Compatible Processors AMD 1st Gerenration Ryzen
Chipset Type AMD B450
Memory Clock Speed 2400 MHz
Platform Windows 10
Memory Storage Capacity 128 GB
RAM Memory Maximum Size 128 GB

About this item

  • AMD AM4 Socket : Compatible to Ryzen 5000, 3rd/2nd/1st Gen AMD Ryzen CPUs.Operating System : Windows 10 64-bit. Windows 7 64-bit
  • Designed for Productivity: USB 3.2 Gen 2 with 10Gbps ultra-fast transfer speed, onboard M.2 support, 4xDIMMs support up to 128GB DDR4 with 4400 (O.C.) performance, HDMI 2.0b/DVI/D-Sub
  • Optimized Cooling: VRM and PCH heatsink with extensive surface, thermal pads help transfer heat from the inductor and phase array to the heatsink. Flexible fan controls for ultimate cooling and quietness with ASUS exclusive Fan Xpert 2 plus
  • Built to Last: all-round protection with LANGuard, DRAM overcurrent protection, overvoltage protection, SafeSlot Core safeguards and stainless-steel back I/O, 1000 plus compatible devices, 8000 plus Validation Hours
  • PC DIY Friendly: With BIOS Flashback and ASUS exclusive UEFI BIOS
  • Outstanding Gaming Audio: Dedicated audio PCB layers, premium Japanese audio capacitors, and audio shielding ensures precision analog/digital separation and greatly reduced multi-lateral interference.
  • Aura Sync RGB and Armoury Crate Utility: with ASUS Armoury Crate synchronizing LED effects across a wide range of compatible PC gear, plus RGB LED and RGB header for greater customization
  • Please ensure your BIOS is up to date if installing a compatible Ryzen 5000 series CPU. Visit ASUS site search by motherboard model name, click on “Support” tab, Drivers and Tools, then BIOS and Firmware to download the latest BIOS.

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Top Brand: ASUS

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This Item
ASUS Prime B450M-A II AMD AM4 (Ryzen 5000, 3rd/2nd/1st Gen Ryzen Micro ATX Motherboard (128GB DDR4, 4400 O.C.), NVMe, HDMI 2.0b/DVI/D-Sub, USB 3.2 2, BIOS Flashback, and Aura Sync)
ASUS Prime B450M-A II AMD AM4 (Ryzen 5000, 3rd/2nd/1st Gen Ryzen Micro ATX Motherboard (128GB DDR4, 4400 O.C.), NVMe, HDMI 2.0b/DVI/D-Sub, USB 3.2 2, BIOS Flashback, and Aura Sync)
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ASUS Prime B550M-A AC AMD AM4 (3rd Gen Ryzen™) Micro ATX Motherboard (PCIe 4.0, WiFi, ECC Memory, 1Gb LAN, HDMI 2.1/D-Sub, 4K@60HZ, Addressable Gen 2 RGB Header and Aura Sync)
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ASUS Prime B550-PLUS AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX Motherboard (PCIe 4.0, ECC Memory, 1Gb LAN, HDMI 2.1, DisPlayPort 1.2 (4K@60HZ), Addressable Gen 2 RGB Header and Aura Sync).
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Asus ROG Strix B550-F Gaming WiFi II AMD AM4 (3rd Gen Ryzen) ATX Motherboard (PCIe 4.0,WiFi 6E, 2.5Gb LAN, BIOS Flashback, HDMI 2.1, Addressable Gen 2 RGB Header and Aura Sync)
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ASUS TUF Gaming A520M-PLUS (WiFi) AMD AM4 (3rd Gen Ryzen™) microATX Motherboard (M.2 Support, 802.11ac Wi-Fi, DisplayPort, HDMI, D-Sub, USB 3.2 Gen 1 Type-A and Aura Addressable Gen 2 headers)
ASUS TUF Gaming A520M-PLUS (WiFi) AMD AM4 (3rd Gen Ryzen™) microATX Motherboard (M.2 Support, 802.11ac Wi-Fi, DisplayPort, HDMI, D-Sub, USB 3.2 Gen 1 Type-A and Aura Addressable Gen 2 headers)
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ASUS TUF Gaming B550M-PLUS AMD AM4 (3rd Gen Ryzen™) Micro ATX Gaming Motherboard (PCIe 4.0, 2.5Gb LAN, BIOS Flashback, HDMI 2.1, USB 3.2 Gen 2, Addressable Gen 2 RGB Header and Aura Sync)
ASUS TUF Gaming B550M-PLUS AMD AM4 (3rd Gen Ryzen™) Micro ATX Gaming Motherboard (PCIe 4.0, 2.5Gb LAN, BIOS Flashback, HDMI 2.1, USB 3.2 Gen 2, Addressable Gen 2 RGB Header and Aura Sync)
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Price-13% $69.99
List: $79.99		$98.21-21% $109.99
List: $139.99		-16% $159.99
List: $189.99		-10% $89.99
List: $99.99		$155.00
Delivery
—
Get it as soon as Friday, May 10
Get it as soon as Wednesday, May 8
Get it as soon as Wednesday, May 8
Get it as soon as Wednesday, May 8
—
Customer Ratings
4.54.5 out of 5 stars5,762
4.54.5 out of 5 stars2,939
4.54.5 out of 5 stars2,939
4.64.6 out of 5 stars9,061
4.64.6 out of 5 stars839
4.64.6 out of 5 stars583
For gaming
4.1
4.1
4.1
4.4
4.1
4.3
Tech Support
3.9
3.9
3.9
4.0
4.0
3.4
Value for money
4.2
4.1
4.1
4.2
4.2
—
Stability
—
3.8
3.8
4.1
4.3
3.8
Easy to install
4.3
4.0
4.0
4.3
—
—
Sold By
Amazon.com
Amazon Warehouse
Amazon.com
Amazon.com
Amazon.com
WIDEAZ
platform
windows 10
windows 10
windows 10
windows95
windows 10
windows 10
cpu socket
Socket AM4
Socket AM4
Socket AM4
Socket AM4
Socket AM4
Socket AM4
memory slots
4
4
4
4
4
4
memory capacity
128 GB
1024 GB
128 GB
128 GB
32 GB
128 GB
compatible processors
AMD 1st Gerenration Ryzen
AMD 3rd Generation Ryzen
AMD 3rd Generation Ryzen
AMD 3rd Generation Ryzen
AMD 3rd Generation Ryzen
AMD 3rd Generation Ryzen
card interface
integrated
pci e
pci e
pci e
—
pci e

Looking for specific info?

Product Description

Powered by Ryzen 5000, 3rd Gen AMD® Ryzen™ processors, the ASUS Prime B450M-A II provides the solid foundation needed for your first build, plus flexibility to grow with your ambitions with a robust power design, automated system tuning, comprehensive cooling controls, and immersive onboard audio.

Product guides and documents

User Manual (PDF)

Product information

Technical Details

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Summary
Other Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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ASUS

ASUS Prime B450M-A II AMD AM4 (Ryzen 5000, 3rd/2nd/1st Gen Ryzen Micro ATX Motherboard (128GB DDR4, 4400 O.C.), NVMe, HDMI 2.0b/DVI/D-Sub, USB 3.2 2, BIOS Flashback, and Aura Sync)

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From the manufacturer

Prime B450M-A II
Prime B450M-A II

Prime B450M-A II

ASUS is one of Fortune magazine’s World’s Most Admired Companies and is one of the top motherboard and gaming brands as well as a top-three consumer notebook vendor. ASUS is driven by passion and innovation and dedicated to creating quality products for a future smart life, designing and manufacturing products that perfectly meet the needs of today's digital home, office and person. Our wide portfolio includes MG248Q, Chromebox and a range of devices and components, along with AR and VR.

PRIME B450M-A II

AMD B450 (Ryzen AM4) micro ATX motherboard with M.2 support, HDMI/DVI-D/D-Sub, SATA 6 Gbps, 1 Gb Ethernet, USB 3.2 Gen 2 Type-A, BIOS FlashBack, and Aura Sync RGB lighting support

  • Comprehensive cooling: VRM heatsink, PCH heatsink, and Fan Xpert 2+
  • Ultrafast connectivity: M.2 support, 1 Gb Ethernet, and USB 3.2 Gen 2 Type-A
  • 5X Protection III: Multiple hardware safeguards for all-around system protection
  • Aura Sync RGB Lighting: Onboard connector for RGB LED strips, easily synced with an ever-growing portfolio of Aura Sync-capable hardware

Prime B450M-A II

Prime B450M-A II

Prime B450M-A II

VRM Heatsink and Thermal Pads

A VRM heatsink with an underneath thermal pad improves heat transfer from the MOSFETs for better cooling performance.

Cooler by Design

Prime B450M-A II is engineered with an array of hybrid fan headers and features comprehensive cooling controls that are configurable via Fan Xpert 2+ software or via the UEFI BIOS, ensuring your rig stays cool and stable under intense workloads.

PCIe 3.0 M.2 (up to 32 Gbps)

Achieve speed with onboard M.2.

M.2 Slot supports up to 22110 and data-transfer speed up to 32Gbps via x4 PCI Express 3.0 bandwidth. It‘s the perfect choice for an operating system or application drive, providing fast access to data.

Prime B450M-A II

Prime B450M-A II

Prime B450M-A II

USB 3.2 Gen 2 Type-A

Numerous USB ports support high-end rigs loaded with peripherals, including two rear-panel USB Type-A connectors with fast USB 3.2 Gen 2 connectivity for compatible cases.

BIOS FLASHBACK

BIOS FlashBack is the simplest and safest (UEFI) BIOS update method. Simply drop the (UEFI) BIOS file onto a FAT32 formatted USB stick, plug it into the USB BIOS FlashBack port and press the button. Updates can even be performed without having memory or a CPU installed.

SafeSlot Core

A fortified PCIe slot prevents damage.

SafeSlot Core is the ASUS-exclusive PCIe slot. Featuring a fortified design that's anchored to the motherboard by a special hook, SafeSlot Core provides 1.6x stronger retention and 1.3x greater shearing resistance than standard expansion slots.

ASUS, motherboard, AMD, B550, best motherboard, gaming motherboard, gaming

Customer reviews

4.5 out of 5 stars
4.5 out of 5
5,762 global ratings

Customers say

Customers like the quality, performance, value, ease of installation, and boot time of the motherboard. For example, they mention it works flawlessly, it's great for a budget build, and the user manual is easy to follow. They appreciate the fast m.2 NVME speeds and the fact that it boots quickly.

AI-generated from the text of customer reviews

168 customers mention118 positive50 negative

Customers like the quality of the motherboard. They mention it's a decent motherboard for one of the low end CPUs, has a solid build quality, and is a great motherboard for the Ryzen line.

"...Fired up at 3.4. Quick bios change to 3.8 - low volts and solid. I'm not an overclocker so happy and easy...." Read more

"It is a good starter mother board, but if you are looking to install windows 11 on it, need to bypass some windows security features." Read more

"...It’s a shame that there is no quality control on these motherboards anymore … I got 5 bad ones in a row one time … just glad that this one works!" Read more

"...screwdriver/ flathead as the screws are still secure, building everything was good although the IO shield had a large problem for me, the metal tabs..." Read more

148 customers mention117 positive31 negative

Customers like the performance of the motherboard. They mention that it works flawlessly, works in a pinch, and seems to function. Some say that the RAM worked out of the box.

"...However, The Micro-ATX does not work well with my AMD RX580 GPU. It runs fine but the thickness of the GPU with fan covers the PCIE_1 slots so that..." Read more

"...Fine print: Ram worked out of the box. Plug and play. Mobo recognized ram at 2133, quick change in bios to 3.0 - no problems noted...." Read more

"...I have a Ryzen 5, and a RTX 4060 ti installed. So it works great so why 3 stars?..." Read more

"...Works good...." Read more

128 customers mention115 positive13 negative

Customers like the value of the motherboard. They say it's a solid board for the price, great for a budget build, and provides great performance for your money.

"This is the low cost gaming motherboard you are looking for for your AM4 processor.Do some planning though (unlike me)...." Read more

"...ASUS B450M-A because it's featuring USB3.2 Gen 2 and is in very reasonable cost...." Read more

"This computer is great for the price. I have a Ryzen 5, and a RTX 4060 ti installed. So it works great so why 3 stars?..." Read more

"This is a good motherboard to purchase. I am using it with an AMD Ryzen 3 processor chip and 32Gb of RAM memory. Works good...." Read more

81 customers mention63 positive18 negative

Customers find the installation of the motherboard to be easy. They mention that it works at the first try, and the BIOS is easy to set up. They also say that the user manual is easy follow, and that the board is delivered safely with good packaging. Customers also say the installation is simple, and everything plugs in easily.

"...C'mon ... this is 2018 FFS !!All n all. Easiest build ever...." Read more

"...here with a Ryzen 3 3200G cpu and 3000 MHZ DDR4 was a fun, hassle-free build...." Read more

"Hardware installation was a breeze. Installing Windows 11 was a pain in the butt...." Read more

"Easy to install. Fast throughput and the on board video controller is actually usable for gaming. NOT GREAT but serviceable without a GPU." Read more

41 customers mention34 positive7 negative

Customers like the boot time of the motherboard. They mention that it's very fast, the m.2 NVME speeds are fast, and the USB 3.0 is SUPER fast. The shipping was fast and they had no issues during installation. They also say that the first boot to BIOS went smoothly and that it pushes their streaming PC without hassle.

"...For the price point, this was an exceptionally good value. The shipping was fast and I had no issues during installation that wasn't my own damned..." Read more

"...OMG - Never will use a Win 10 CD again. USB 3.0 is SUPER fast - even with HDD. Windows site very easy to make a Win 10 USB...." Read more

"...Feels (obviously) really fast.I wished this board was available with with a heatsink over the VRM, wifi/bluetooth, and two m.2 slots...." Read more

"Easy to install. Fast throughput and the on board video controller is actually usable for gaming. NOT GREAT but serviceable without a GPU." Read more

25 customers mention21 positive4 negative

Customers like the appearance of the motherboard. They say the layout is very well designed, and the triangles on it look great. Some say it's a really nice board with a pleasant pattern.

"...Pros: Solid construction, nice layout, arrived with updated BIOS...." Read more

"...As for the board itself:- very clean look, RGB backglow is subdued enough to leave on even in office environments-..." Read more

"...ran so smoothly I recommend updating the bios and the led is a nice touch" Read more

"Works flawlessly. No issues with install and looks great!" Read more

30 customers mention16 positive14 negative

Customers are mixed about the BIOS. Some mention that there is no BIOS update needed, and it's easy to update the BIOs. However, some say that the BIOSS is terribly lacking and fails to take advantage of even all of the features.

"...Pros: Solid construction, nice layout, arrived with updated BIOS...." Read more

"...to open a screen, and by an accidental setting I was completely unable to open up bios, having to manually reset bios through the motherboard itself..." Read more

"...I also know this board will easily handle and provide a future upgrade path for AMD cpu(s) going forward over the next few years...." Read more

"...It requires a Bios update in order to do so...." Read more

43 customers mention11 positive32 negative

Customers are dissatisfied with the usb ports on the motherboard. They mention that the front USB ports stop working after startup, the m.2 ports are disabled, and the microphone port doesn't work. Some say the USB controllers on the board failed after a year and a half.

"...it should have some rgb lighting on it somewhere and IT DOES NOT have a 3 pin argb connector....really? in this day and age. Oh well...." Read more

"...SATA ports when an nvme is used, doesn't have Bluetooth and ports are extremely tight...." Read more

"Budget Motherboard with good expansion options, 6 usb ports, nvme support, bios flashback up to 3rd gen ryzen cpu support, 2 case fan headers." Read more

"...If I had to complain about something, it would be the lack of water pump ports and internal usb ports for lighting...." Read more

Sleek look
5 Stars
Sleek look
Love this motherboard haven’t gotten to use the aura sync bc my case hasn’t arrived yet but everything else works perfectly only thing the ram is the second spot and the last spot instead of the first and third but that’s not a problem just somthing I’ve never seen before
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Top reviews from the United States

Odie Rivera
5.0 out of 5 stars Solid Motherboard for my Ryzen 2600 !!
Reviewed in the United States on December 20, 2018
Style: B450M-AVerified Purchase
Nice piece of gear for my Micro build !! Nice fit into my Masterbox Q300L (no cd/dvd). Came with updated BIOS out of the box (yes, i checked the site). Put my Ryzen 2600 into mobo, worked first time at stock speed (3.4) with my G.Skill Ram and Seasonic PSU.
Fine print: Ram worked out of the box. Plug and play. Mobo recognized ram at 2133, quick change in bios to 3.0 - no problems noted. Same with CPU. Fired up at 3.4. Quick bios change to 3.8 - low volts and solid. I'm not an overclocker so happy and easy. Finally, it stock fan is VERY QUIET and super easy install in my case. Finally, finally ... with no cd/dvd in case I opted for a USB Win 10 install. OMG - Never will use a Win 10 CD again. USB 3.0 is SUPER fast - even with HDD. Windows site very easy to make a Win 10 USB. Just need a good Win 10 code for final install.

Really really finally - i HATE the LED, PWR switch case connector BS. C'mon ... this is 2018 FFS !!

All n all. Easiest build ever. OBTW: like the case option to put HDD on the 'backside' of motherboard area vice an drive bay - much cleaner wiring, very solid, :)
Pros: Solid construction, nice layout, arrived with updated BIOS.
Cons: -mobo faceplate for case - meh. Not sure if it's the mobo or the case connector but could not get my front case USB 3.0 connector fully flush with the mobo. Works fine, just not a good physical fit, not flush with bottom of the connection - i think it's the case connector, not sure. Diagram on printed instructions for mobo - weak for case connectors / my old eyes.

Good piece of gear !!

Some specs:
G.SKILL Aegis 8GB 288-Pin DDR4 SDRAM DDR4 3000 (PC4 24000) Memory (Desktop Memory) Model F4-3000C16S-8GISB

ASUS GeForce GTX 1070 DUAL-GTX1070-O8G 8GB 256-Bit GDDR5 PCI Express 3.0 HDCP Ready SLI Support Video Card

MasterBox Q300L mATX Case w/Magnetic Design Dust Filter, Transparent Acrylic Side Panel, Air Flow Performance by Cooler Master

Seasonic FOCUS 550 Gold SSR-550FM 550W 80+ Gold ATX12V & EPS12V Semi-Modular 7 Year Warranty Compact 140 mm Size Power Supply
57 people found this helpful
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Misty
5.0 out of 5 stars Pretty easy to install and works very well
Reviewed in the United States on April 4, 2024
Style: B450M-A IIVerified Purchase
I ordered ASUS B450M-A because it's featuring USB3.2 Gen 2 and is in very reasonable cost. ASUS also provide a quite useful tool - Armoury Crate that will install drivers and monitor my system in graphic. However, The Micro-ATX does not work well with my AMD RX580 GPU. It runs fine but the thickness of the GPU with fan covers the PCIE_1 slots so that I have nothing left. I wish I thought about that before I made decision since I intend to install a PCIE to M.2 SSD card to add more SSD space,
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Mark
5.0 out of 5 stars A good gaming motherboard
Reviewed in the United States on January 23, 2024
Style: B450M-A IIVerified Purchase
This is the low cost gaming motherboard you are looking for for your AM4 processor.

Do some planning though (unlike me). I did not take into account how my grossly oversized graphics card (a 3090) was going to hog all the space at the bottom of the board and not leave me any room for my wireless card.

I did not remove any stars for that, because it was my own poor planning.

For the price point, this was an exceptionally good value. The shipping was fast and I had no issues during installation that wasn't my own damned fault.

Fear not, though, my story has a happy ending, because I had several spare USB wireless adapters. Thus, saving me from my own stupidity.
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Jar
4.0 out of 5 stars Great pc
Reviewed in the United States on March 11, 2024
Style: B450M-A IIVerified Purchase
This computer is great for the price. I have a Ryzen 5, and a RTX 4060 ti installed. So it works great so why 3 stars? This computer doesn't have the main security processors necessary to do encryption. On top of that if you look at windows defender it says "Standard hardware security not supported." If encryption and security isn't your number 1 on a pc build, then this computer is for you.
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Walter
5.0 out of 5 stars Good Motherboard
Reviewed in the United States on January 9, 2024
Style: B450M-A IIVerified Purchase
This is a good motherboard to purchase. I am using it with an AMD Ryzen 3 processor chip and 32Gb of RAM memory. Works good. Just remember to update the BIOS after you get the system up and running to take advantage of any updates and glitch fixes that Asus has done since the manufacture of the motherboard.
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carterrh
5.0 out of 5 stars One that works
Reviewed in the United States on March 30, 2024
Style: B450M-A IIVerified Purchase
This is a replacement for one that did not post. It’s a shame that there is no quality control on these motherboards anymore … I got 5 bad ones in a row one time … just glad that this one works!
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AQWOSMC
5.0 out of 5 stars Aceptable y funcional
Reviewed in Mexico on March 21, 2024
Style: B450M-A IIVerified Purchase
La calidad es aceptable. Este es mi segunda tarjeta que compro.
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AQWOSMC
5.0 out of 5 stars Aceptable y funcional
Reviewed in Mexico on March 21, 2024
La calidad es aceptable. Este es mi segunda tarjeta que compro.
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Nombie Almazan
5.0 out of 5 stars Great motherboard
Reviewed in Canada on February 20, 2024
Style: B450M-A IIVerified Purchase
Great motherboard
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Ricardo da Motta
5.0 out of 5 stars Placa mãe
Reviewed in Brazil on January 7, 2024
Style: B450M-A IIVerified Purchase
Muito boa essa placa
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Yadu Krishnan
5.0 out of 5 stars A good board for the price
Reviewed in India on February 26, 2024
Style: B450M-A IIVerified Purchase
Good board. Works well, uses AM4 socket.
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Yadu Krishnan
5.0 out of 5 stars A good board for the price
Reviewed in India on February 26, 2024
Good board. Works well, uses AM4 socket.
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kpopfan
5.0 out of 5 stars Great
Reviewed in the United Kingdom on January 8, 2020
Style: B450M-AVerified Purchase
Its good
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