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GIGABYTE

GIGABYTE B550 UD AC (rev. 1.2) Motherboard, Supports AMD AM4 Ryzen 5000 Processors, ATX, DDR4, Dual M.2, SATA 6Gb/s, Intel 802.11a/b/g/n/ac, Realtek GbE LAN, PCIe 4.0

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Availability: Only 5 left in stock, order soon!
Fulfilled by Amazon
Arrives Friday, Mar 20
Order within 23 hours and 17 minutes
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Style: B550|D|M.2 x2|WIFI5


Size: ATX


Features

  • AMD AM4 Socket: Supports AMD Ryzen 5000 Series/ Ryzen 5000 G-Series/ Ryzen 4000 G-Series and Ryzen 3000 Series Processors
  • DDR4 Compatible: Dual Channel ECC/ Non-ECC Unbuffered DDR4, 4 DIMMs
  • Sturdy Power Design: 10 plus3 Phases Digital Twin Power Design with Low RDS(on) MOSFETs
  • Connectivity: PCIe 4.0 x16 Slot, Dual Ultra-Fast NVMe PCIe 4.0/3.0 x4 M.2 Connectors, Realtek GbE LAN chip
  • Fine Tuning Features: RGB FUSION 2.0, Supports Addressable LED and RGB LED Strips, Smart Fan 5, Q-Flash Plus Update BIOS without installing, CPU, Memory, and GPU

Description

AMD AM4 Socket: Supports AMD Ryzen 5000 Series/ Ryzen 5000 G-Series/ Ryzen 4000 G-Series and Ryzen 3000 Series Processors DDR4 Compatible: Dual Channel ECC/ Non-ECC Unbuffered DDR4, 4 DIMMs Sturdy Power Design: 10+3 Phases Digital Twin Power Design with Low RDS(on) MOSFETs Connectivity: PCIe 4.0 x16 Slot, Dual Ultra-Fast NVMe PCIe 4.0/3.0 x4 M.2 Connectors, Realtek GbE LAN chip Fine Tuning Features: RGB FUSION 2.0, Supports Addressable LED & RGB LED Strips, Smart Fan 5, Q-Flash Plus Update BIOS without installing, CPU, Memory, and GPU. GIGABYTE B550 UD AC motherboards maximize your PC's potential with AMD StoreMI technology. StoreMI accelerates traditional storage devices to reduce boot times and enhance the overall user experience. This easy-to-use utility combines the speed of SSDs with the high capacity of HDDs into a single drive, enhances the read/write speeds of the device to match that of SSDs, bolsters data performance for great value, and transforms the everyday PC to a performance driven system.

Brand: GIGABYTE


CPU Socket: Socket AM4


Compatible Devices: Personal Computer


RAM Memory Technology: DDR4


Compatible Processors: AMD 3rd Generation Ryzen


Chipset Type: AMD B550


Platform: Windows


Model Name: B550 UD AC


Memory Storage Capacity: 128 GB


RAM Memory Maximum Size: 128 GB


RAM: ‎DDR4


Wireless Type: ‎802.11a/b/g/n/ac


Number of USB 2.0 Ports: ‎4


Brand: ‎GIGABYTE


Series: ‎B550 UD AC


Item model number: ‎B550 UD AC


Item Weight: ‎2.71 pounds


Product Dimensions: ‎13.18 x 10.62 x 3.14 inches


Item Dimensions LxWxH: ‎13.18 x 10.62 x 3.14 inches


Manufacturer: ‎GIGABYTE


Date First Available: ‎February 1, 2023


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Mar 20

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Excellent motherboard — my PC is now super fast! 🚀
Style: B550M|K|M.2 x2|Non-WIFI Size: mATX
⭐⭐⭐⭐⭐ I recently installed the GIGABYTE B550M K, and the difference was immediate. I used to have my Ryzen 5 on an A320HM motherboard, and even though it worked, it didn’t let the CPU reach its full potential. After switching to this one, my PC runs much faster and more stable. What I like the most is that it’s the right board for AM4 processors, with great build quality and a very reasonable price. It allowed me to complete the mid-range PC I wanted without spending too much, and everything worked perfectly from the first boot. It also has two M.2 slots, which is great if you want a fast SSD. Plus, the Micro-ATX format fits nicely in my small case while leaving room for everything I need. In short, this was an excellent purchase — it does exactly what it promises and gave my computer a whole new life. 💯 Definitely a 5-star product! ... show more
Reviewed in the United States on October 22, 2025 by Omar Bido Mesa
    • Reliable Mid-Range Motherboard with Great Value
Style: B550M|D|M.2 x2|WIFI5 Size: mATX
Plenty of USB ports and expansion slots for a compact board — everything connects cleanly without crowding. The built-in heatsink does a solid job keeping temps down, and overall build quality feels premium for its price range. Sound output is clean, and compatibility with Ryzen parts was smooth from the start. A well-balanced, reliable motherboard that punches above its class. ... show more
Reviewed in the United States on October 12, 2025 by Kevin N.
    • Gets the job done
Style: B550M|K|M.2 x2|Non-WIFI Size: mATX
Got it during June Amazon Prime sales. Haven't had any problems yet. Did need to update the bios but it's very easy with this motherboard. Runs my 5500 just fine and can run PBO -15 all cores just fine. Just with it had wifi, or at least some argb headers, especially being a b550. For the price, when on sale, is a good product. ... show more
Reviewed in the United States on October 19, 2025 by Josh
    • Interesting features, lacking in others.
Style: B550M|K|M.2 x2|Non-WIFI Size: mATX
Surprisingly modern, but lacks some features. The ports on the back don’t include the old analogue video ports, and includes even display port. The m.2 ssd ports have screw less installation, but there don’t appear to be rgb headers and there aren’t very many fan headers. Lacks an internal usb c header. Worked perfectly. ... show more
Reviewed in the United States on August 18, 2025 by Wise96789Shopper
    • Great Buy for a Budget 1440p PC
Style: B550M|D|M.2 x2|WIFI5|R2 Size: mATX
This motherboard is pretty solid! I grabbed the GIGABYTE B550M DS3H AC R2 on Black Friday, and honestly, for the price, it's a solid 5/5. Worth every penny. It comes with some nice things for a micro-ATX board, like having two M.2 slots, which is really convenient for all your SSD storage. It’s got a decent power setup and plenty of headers for fans and RGB stuff, which is always a plus when you're building. It includes Bluetooth 5.0 and WiFi 5, and the wireless is totally fine for just daily browsing. But let's be real, with a max speed of 433mbps (I'm seeing about 300mbps), it's a downside when you're trying to download massive games, that just isn't cool. Thankfully, the 1Gbit wired connection can handle the heavy lifting. I really wish they'd sprung for WiFi 6, though. I've also got mixed feelings on the USB-C setup: you get the internal header for a case with a front USB-C port, but there's no actual USB-C port on the back. Weird, right? Even with those two little quirks, it was an absolutely stellar deal at the Black Friday price, and I highly recommend it, especially if you can find it on sale. ... show more
Reviewed in the United States on December 4, 2025 by Denis F.
    • Very good quality motherboard
Style: B550M|D|M.2 x2|WIFI5|R2 Size: mATX
Very good motherboard. It has diagrams and was easy to work with for someone who had never worked with a PC. It has many options and supports USB-C with high-speed megatransfers. You have to update the BIOS yourselves, but it's very easy with a USB drive.
Reviewed in the United States on November 18, 2025 by Harold Flores Mateo
    • Avoid this board! You may have purchased an intentionally limited board without knowing!
Style: B550|D|M.2 x2|WIFI5 Size: ATX
Please do NOT purchase this particular board. I purchased this board and was having problems with performance with my rtx 3090. I'm talking busted FPS stuttering and screen tearing. bios options allowed for switching the PCIE lane from 16x 2x8, etc, but nothing solved the problem. It turns out there are RETAIL and OEM versions of this board, and I was sent an OEM version (Y1). If you are having GPU performance problems with your system and this board, check what version it is! The OEM version, Y1 in the upper right corner of the board only has a 1x slot at the top, not the advertised 16x, even though it LOOKS like a 16x slot. My GPU was starving for bandwidth! There is no way to tell unless you deep search in Google and find this unique problem on its Y1 boards. I should never have been sent a Y1 board, and now the return period is over. But who in the world would think that their PCIe lane was crippled from shipping? Everything else works fine, but when you run lspci -vv, or lspci -t, it will show you your GPU is connected to a branch of the lane, not the root of the lane . . . . a fraudulent scam. Even on gigabyte's website, they show Y1 board images, but that is not the one you should get. Avoid gigabyte for this bait and switch tactic. this was the third gigabyte motherboard I had purchased in as many years of of amazon, but gigabyte no longer. Not their GPUs, not their boards, nothing until this deceiptive marketing is over. ... show more
Reviewed in the United States on November 6, 2025 by Amazon Customer
    • Great mobo
Style: B550M|K|M.2 x2|Non-WIFI Size: mATX
Review Image by Robert Pysher Robert Pysher
High quality, looks great, cost effective, works great!!! Highly recommend For a budget pc thats not build.
Reviewed in the United States on November 2, 2025 by Robert Pysher Robert Pysher

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