




Brand | ASUS |
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Model | PRIME B550M-K |
CPU Socket Type | AM4 |
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CPU Type | BIOS update might require for AMD Zen 3 Ryzen 5000 series CPU. Refer to ASUS website for CPU support list. |
Chipset | AMD B550 |
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Number of Memory Slots | 4x288pin (DDR4) |
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Memory Standard | 3rd Gen AMD Ryzen Processors DDR4 4600(O.C)/ 4400(O.C)/ 4266(O.C.)/ 4133(O.C.)/ 4000(O.C.)/ 3866(O.C.)/ 3733(O.C.)/ 3600(O.C.)/ 3466(O.C.)/ 3333(O.C.)/ 3200/ 3000/ 2800/ 2666/ 2400/ 2133 MHz Un-buffered Memory * Next Generation AMD Ryzen PRO Processors DDR4 4800(O.C.)/ 4600(O.C)/ 4466(O.C.)/ 4400(O.C)/ 4266(O.C.)/ 4133(O.C.)/ 4000(O.C.)/ 3866(O.C.)/ 3733(O.C.)/ 3600(O.C.)/ 3466(O.C.)/ 3333(O.C.)/ 3200/ 3000/ 2800/ 2666/ 2400/ 2133 MHz Un-buffered Memory * ECC Memory (ECC mode) support varies by CPU. * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists). |
Maximum Memory Supported | 128GB |
Channel Supported | Dual Channel |
PCI Express 4.0 x16 | 3rd Gen AMD Ryzen Processors 1 x PCIe 4.0 x16 (x16 mode) |
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PCI Express x1 | AMD B550 Chipset 2 x PCIe 3.0 x1 |
SATA 6Gb/s | 4 x SATA 6Gb/s |
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M.2 | 3rd Gen AMD Ryzen Processors: 1 x M.2 Socket 3, with M Key, Type 2242/2260/2280/22110 (PCIE 4.0 x4 and SATA modes) storage devices support AMD B550 Chipset: 1 x M.2 Socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support |
SATA RAID | 0/1/10 |
Onboard Video Chipset | Supported only by CPU with integrated graphic: 1 x D-Sub 1 x DVI-D 1 x HDMI 2.1(4K@60HZ) |
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Audio Chipset | Realtek ALC887 |
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Audio Channels | 7.1 Channels |
LAN Chipset | Realtek RTL8111H |
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Max LAN Speed | 10/100/1000Mbps |
Back I/O Ports | 1 x PS/2 keyboard/mouse combo port(s) 1 x DVI-D 1 x D-Sub 1 x HDMI 1 x LAN (RJ45) port(s) 2 x USB 3.2 Gen 2 (teal blue) (2 x Type-A) 4 x USB 3.2 Gen 1 (blue) Type-A 3 x Audio jack(s) |
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Onboard USB | 1 x USB 3.2 Gen 1 (up to 5Gbps) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s) 2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s) |
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Other Connectors | 1 x CPU Fan connector(s) 2 x Chassis Fan connector(s) 1 x SPI TPM header 1 x S/PDIF out header(s) 1 x Front panel audio connector(s) (AAFP) 1 x Clear CMOS jumper(s) 1 x System panel connector 1 x COM port header 1 x Speaker connector |
Form Factor | Micro ATX |
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LED Lighting | None RGB |
Dimensions (W x L) | 9.6" x 9.6" |
Power Pin | 1 x 24-pin EATX Power connector(s) 1 x 8-pin EATX 12V Power connectors |
Windows 11 | Supported |
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Features | Software Features: ASUS Exclusive Software Armoury Crate AI Suite 3 - Performance And Power Saving Utility TurboV EVO EPU Digi+ VRM Fan Xpert 2+ - EZ update ASUS CPU-Z AI Charger DAEMON Tools Norton Anti-virus software (Free Trial for 60 days) WinRAR UEFI BIOS ASUS EZ DIY - ASUS CrashFree BIOS 3 - ASUS EZ Flash 3 - ASUS UEFI BIOS EZ Mode ASUS Special Features: ASUS 5X PROTECTION III - ASUS DIGI+ VRM - ASUS LANGuard - ASUS Overvoltage Protection - ASUS SafeSlot Core - ASUS Stainless-Steel Back I/O ASUS Q-Design - ASUS Q-DIMM - ASUS Q-Slot ASUS Thermal Solution - Aluminum heatsink design ASUS Lighting Control BIOS: 256MB Flash ROM, UEFI AMI BIOS Manageability: WOL by PXE Operating System: Windows 10 64-bit |
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Package Contents | Accessories: User's manual I/O Shield 2 x SATA 6Gb/s cable(s) 1 x Supporting DVD 1 x M.2 SSD screw package(s) |
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Date First Available | June 15, 2020 |
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Pros: This board fits perfectly into a 2005 LIAN-LI midtower ATX case that I like. I still like cases that take drives and I use 2 CD-DVD drives with one being a Blue ray burner. Prior to purchasing this ASUS Prime, I bought another different model Prime board from another dealer and it was determined at a computer shop to be DOA. That was a full size ATX board which I preferred, but had to change my preference and glad I did. This one is a "micro"- ATX case because it's shorter than a standard ATX size. In spite of the shortness, there was no problem fitting this MB into a full ATX case. All 8 mounting holes aligned perfectly with some of the mounting hole standoff knockouts. With LIAN-LI, square knock outs are on the board chassis because the standoffs are clips that snap into those square knockouts. The MB mounting screws go into those standoff clips. These clips are very secure if they are carefully handled. Now onto the board. I didn't have to update. A former neighbor's nephew who has a PC building business drove some 35 miles south to help me out with a Ryzen Wraith cooler installation (see my review of an AMD Ryzen 5 5600G with graphics). No update was needed as the bios/UEFI on this particular board was dated 7/31/2021 and was also the proper number which was higher than the minimum one required for the processor purchased. It's nice to now have a 64bit MB and processor after having 32 bit which was getting long in the tooth after so many years. My privious builds in that 2005 LIAN-LI was all 32bit. It's so nice that ASUS maintained legacy on the header pins with provisions for 2 USB 2 headers (for 4 front panel connectors). That ole beasty case has 4 on the bottom front, and that's great! I continue to have access to those. The shorter "micro" ATX size MB makes it way easier to access the header pins when attaching connectors like the drive light power and reset, even the case speaker which works. Less frustration, better visibility. Even though it's shorter length makes for fewer card connectors, having a pair of PCI-e's is all I really need. Looking to getting a Hauppauge HD quad video TV tuner. This MB pretty much takes anything you give to it as long as it's listed with the type of processor and memory you use. Can't find the memory you're interested in listed at ASUS? Go to the memory manufacturer's site and use their configurator and check there. That happened with my build, and G-skill had it! Use the descriptor number shown on a label on the card inside the G-skill packaging. Other brands may differ. If listed it's good to go. What ASUS may not get around to testing, the memory manufacturers may have done that. There's lots out there. And yes one more thing. The grounding plate connector cutouts align with the connector cluster on the rear of the MB with NO affect on board mounting hole alignment despite the case's age. Goes to show that when there's standards like ATX, you can use an older case and you can have the computer you love with new guts. How good is that?! Don't forget to update with a new power supply! ATX standard again, no problem. The cluster has all the standard video connections including VGA..hummmm.. It's sure versatile.
Cons: One con I have is that when pressing your drive connectors (SATA) into the board, be careful. It's a good idea to place your thumb on the corner edge of the MB nearest those 4 SATA connectors on the lower right and gently push up as push your connectors down into the headers. There's components like resistors and capacitors surface mounted that's smaller than a sesame seed and only a tad larger than a poppy seed, and lots of em'. Too much pressure without thumb support could cause micro fracturing of the solder joints. Since lead is typically not used these days in tech, silver is used as a replacement with little solder used as possible for necessary connections.
Overall Review: Yes indeed if you got an ATX case that you're attached to. Go get yourself one!
Pros: I like this 550 board because of the pcie 4.0 and the white and black aesthetics. It has a nice orange track in the lower left corner that glows orange in a breathing pattern which i like
Cons: You dont get any bells or whistles with this board. Just 2 fan headers, no rgb headers or heat pump headers
Overall Review: Its a good board if you dont want any rgb
Cons: Worked great for a month. Will not turn on a power supply.
Overall Review: At this point i would not recommend it