9 Best Micro ATX Motherboards (October 2026)

Micro ATX is the compromise size that quietly powers a large share of home-built PCs. A board in this format is shorter than full ATX, so it fits compact cases, yet it keeps enough slots and memory sockets for a real graphics card, a couple of SSDs and room to grow. The hard part is that the same size now covers two memory generations, three processor sockets and a wide spread of price tiers, which makes shopping by size alone a recipe for mismatched parts.

The nine boards below are sorted by what the listing says: socket, supported processor families, memory type, M.2 slot count, PCIe generation, networking and any power-delivery figures. Anything the title does not state is left alone. Whether you are rebuilding an older AM4 machine, planning a fresh AM5 system for 2026, or staying on Intel LGA 1700, the buying thresholds and the platform comparison further down will help you choose without overpaying for features you will never use.

Quick Picks

GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard, Supports Ryzen 5000/4000/3000 Series Processors, DDR4, 3+3 Power Phase, 2X M.2, PCIe 4.0, USB 3.2 Gen 1, GbE LAN, Q-Flash

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GIGABYTE B850M AORUS Elite WIFI6E ICE AMD AM5 mATX Motherboard, Support AMD Ryzen 9000/8000/7000 Series, DDR5, 12+2+2 Power Phase, 2X M.2, PCIe 5.0, USB-C, WIFI6E, 2.5GbE, EZ-Latch, 5-Year Warranty

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GIGABYTE B850M Eagle WIFI6E AMD AM5 mATX Motherboard, Support AMD Ryzen 9000/8000/7000 Series, DDR5, 8+2+2 Power Phase, 2X M.2, PCIe 5.0, USB-C, WIFI6E, 2.5GbE LAN, EZ-Latch, 3-Year Warranty

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ASUS Prime B550M-A WiFi II AMD Micro ATX DDR4 Motherboard with PCIe 4.0, WiFi 6, ECC Memory, HDMI 2.1, RGB Header

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ASUS ROG Strix B850-G Gaming WiFi AMD AM5 B850 mATX Motherboard, Advanced AI PC Ready, 14+2+1 Power Stages, DDR5 Slots, 4X M.2 Slots, PCIe® 5.0 Ready, WiFi 7, 2.5G LAN, USB 20Gbps Type-C®, AI Advisor

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ASRock B850M-X WiFi R2.0 AM5 Micro-ATX Motherboard: Supports AMD Ryzen 9000/8000/7000 CPUs, DDR5 8200+ (OC), PCIe 5.0, Wi-Fi 6E, 2.5G LAN, USB-C, BIOS Flashback

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MSI PRO B550M-P Motherboard, mATX - Supports AMD Ryzen 5000/5000 G-Series, 4000 G-Series, 3000 G-Series Desktop Processors, AM4 - DDR4 Memory Boost (4400+ MT/s OC), PCIe 4.0 x16, M.2 Gen4, Micro-ATX

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ASUS B760M-AYW WiFi D4 II Intel® B760 (LGA 1700) microATX mATX Motherboard, PCIe 5.0 x16 Support, Two M.2 Slots, DDR4, Realtek 2.5Gb Ethernet, Wi-Fi 6, HDMI, SATA 6 Gbps, Front USB 5Gbps, Aura Sync

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ASRock B550M-HDV Socket AM4 Micro-ATX Motherboard, Supports AMD Ryzen 5000/4000/3000 Series Processors, DDR4 4733+(OC), PCIe 4.0, Gigabit LAN

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The 9 Best Options

GIGABYTE B550M K

This board is for someone refreshing an existing AM4 system or building a modest new one around a Ryzen 5000 chip. The title lists the AM4 socket, Micro-ATX size, support for Ryzen 5000, 4000 and 3000 series processors, DDR4 memory, a 3+3 power phase design, two M.2 slots, PCIe 4.0 and USB 3.2 ports. No wireless networking is mentioned, so plan on a cable or a separate adapter. It rewards a buyer who already owns a Ryzen processor and DDR4 modules and simply needs a stable foundation. Within a small case, the plain layout and modest feature list keep the build simple, and the two M.2 slots avoid the cramped storage choices that plague the cheapest boards.

• Two M.2 slots allow a boot drive and a second SSD without extra adapters.
• PCIe 4.0 supports current fast graphics cards and NVMe drives on this platform.
• Wide processor support, from Ryzen 3000 to 5000, suits both new and reused parts.

• A 3+3 power phase layout is modest, so it fits mainstream processors better than power-hungry ones.
• The title names no built-in Wi-Fi, which adds a small extra cost for wireless users.

Skip it if you want high-end overclocking headroom or the newest platform. It sits at the entry end of the group, and the next pick, the B850M AORUS Elite, shows what moving to AM5 and DDR5 changes. Treat this one as the practical choice for upgrading a machine you already own. Pair it with a mid-range processor and a sensible cooler, and it behaves like a quiet, dependable base.

GIGABYTE B850M AORUS Elite WIFI6E ICE

The AORUS Elite is the feature-rich AM5 option for a buyer who wants to build once and upgrade the processor later. The title lists an AM5 socket, mATX size, support for Ryzen 9000, 8000 and 7000 series processors, DDR5 memory, a 12+2+2 power phase layout, two M.2 slots, PCIe 5.0 and USB connectivity, plus WiFi 6E in the name. The ICE label suggests a light-colored theme, which appeals to white-themed builds. For a compact case with a glass panel, that styling matters to some buyers, but the real draw is the combination of built-in wireless, a generous power design in the title and a socket with room to grow. It is a board you buy when you intend to keep the platform for years.

• A 12+2+2 power phase layout is the strongest figure among the GIGABYTE boards listed.
• Built-in WiFi 6E removes the need for a separate adapter.
• Support for three Ryzen generations gives flexibility when choosing a processor.

• DDR5 memory costs more than DDR4, which raises the platform cost.
• Only two M.2 slots are named, fewer than the ROG Strix later in the list.

Skip it if you only need a basic office build, since you would pay for power delivery you will not use. Phase counts alone do not prove quality, but they do hint at the intended processor tier. The next pick, the B850M Eagle, keeps the platform with a lighter power design. The two boards share the same family look, so the choice comes down to how demanding your processor is.

GIGABYTE B850M Eagle WIFI6E

The Eagle sits one tier below the AORUS Elite in the same family and suits mainstream AM5 builds. The title lists AM5, mATX, support for Ryzen 9000, 8000 and 7000 series processors, DDR5 memory, an 8+2+2 power phase layout, two M.2 slots, PCIe 5.0, USB-C and Wi-Fi. It keeps the headline features of the platform while using a lighter power design. That makes it the sensible default for buyers who want AM5 without chasing every extra. The title mentions USB-C, which is handy for modern external drives and phones, and the dual M.2 layout handles an operating system drive plus one game drive without trouble.

• An 8+2+2 power phase layout is sufficient for mid-range Ryzen processors in typical use.
• USB-C and Wi-Fi are listed, which covers modern connectivity needs.
• It shares the AM5 platform and its upgrade path with the pricier boards.

• Fewer power phases than the AORUS Elite means less room for demanding processors.
• Two M.2 slots are a limit for storage-heavy builders.

Skip it if you plan to pair it with a top-end processor and heavy workloads. For a typical gaming build, it is a sensible way to join the AM5 platform without paying for features beyond your needs. If you later outgrow the processor, you can swap it within the socket while the board stays put. Next is ASUS with an AM4 board that includes wireless.

ASUS Prime B550M-A WiFi II

ASUS Prime appeals to AM4 buyers who want built-in wireless and a recognizable brand. The title lists an AMD Micro ATX board with DDR4 memory, PCIe 4.0, WiFi 6, ECC memory support, HDMI 2.1 and an RGB header. HDMI 2.1 on the board matters for people who use a processor with built-in graphics and a modern display. Brand familiarity is the main reason people pick ASUS Prime boards for plain, reliable builds. The ECC mention is unusual in this category, but it only pays off with compatible hardware, so treat it as a curiosity unless you know you need it.

• Built-in WiFi 6 means no extra adapter for wireless networking.
• HDMI 2.1 is listed, which suits builds relying on processor graphics.
• An RGB header allows lighting accessories without fuss.

• The title does not state the number of M.2 slots, so check before buying.
• ECC memory support depends on the processor and module, so it is not a plug-and-play benefit for most buyers.

Skip it if you need a clearly stated storage layout or want the newest platform. It is a steady pick for an AM4 home or office machine. The ROG Strix after it is a very different board aimed at storage-heavy gaming builds. Everything about the Prime says steady and sensible, while everything about the Strix says room to grow.

ASUS ROG Strix B850-G Gaming WiFi

The ROG Strix is the enthusiast’s pick for a compact AM5 gaming build. The title shows an AM5 B850 mATX board with 14+2+1 power stages, DDR5 slots, four M.2 slots, PCIe 5.0 readiness, WiFi and an AI-ready label. Four M.2 slots are unusual in a board this small and make it useful for anyone who collects fast drives. The gaming branding comes with a premium positioning, so it suits a buyer who is already planning a strong processor and graphics card and wants the board to keep pace. The 14+2+1 figure is the largest power-stage count in the roundup, which is a useful sign of intent even if the number alone proves nothing.

• Four M.2 slots give the most storage expansion in this group.
• 14+2+1 power stages are the highest figure listed, supporting demanding processors.
• PCIe 5.0 readiness and DDR5 position it for long-term upgrades.

• It sits in the upper tier of the group, so it asks the most from the budget.
• “AI PC Ready” is a marketing label, not a measurable feature.

Skip it if you only need one or two drives and a basic setup. It would be overkill for an office machine, and its strengths show up only when you use the extra slots and power delivery. Compared with the ASRock B850M-X, it is the performance-first option. The ASRock instead puts networking first, and for many home builds that is the smarter spend.

ASRock B850M-X WiFi R2.0

ASRock’s B850M-X is aimed at buyers who value fast networking and a straightforward AM5 platform. The title lists AM5, Micro-ATX, support for Ryzen 9000, 8000 and 7000 CPUs, DDR5 8200+ with overclocking, PCIe 5.0, Wi-Fi 6E, 2.5G LAN and USB-C. The 2.5G LAN port is a quiet advantage for anyone moving large files across a home network. Because the visible title lists neither a power phase count nor storage slots, treat the board as a networking-and-compatibility pick and read the full specification page before ordering. It is a good fit for someone moving from a wired desktop who wants a modern platform without extras.

• 2.5G LAN and Wi-Fi 6E cover both wired and wireless needs.
• DDR5 memory support is quoted up to 8200+ with overclocking, signaling plenty of headroom.
• USB-C is included, which is increasingly essential for modern devices.

• The title gives no power phase count, so its processor headroom is harder to judge.
• The number of M.2 slots is not stated in the visible title.

Skip it if you want to compare power delivery on paper or need clear storage numbers. Memory speed claims with “OC” attached depend on the memory kit and the processor, so treat them as a ceiling and not a promise. The MSI board that follows moves back to the AM4 platform. That swap is deliberate: it shows how the AM5 and AM4 families divide the market between future-proofing and thrift.

MSI PRO B550M-P

The MSI PRO B550M-P is a no-frills AM4 board for a simple build. The title lists an mATX AM4 board supporting Ryzen 5000, 5000 G-Series, 4000 G-Series and 3000 G-Series desktop processors, plus DDR4 memory boost. The G-Series mentions are valuable because those are processors with built-in graphics, so the board suits a build without a separate graphics card. That is the use case where this board shines: a small, quiet machine for browsing, documents, streaming and light games, with the option to add a graphics card later. The PRO naming signals a practical, business-friendly line rather than a gaming one.

• Support for several G-Series processors makes it handy for APU-based home or office machines.
• DDR4 memory keeps the total cost low for a new or refreshed build.
• The PRO line is aimed at stable, plain-spec systems rather than flashy ones.

• The visible title does not mention wireless networking, M.2 count or PCIe generation.
• It is not the pick for heavy overclocking or high-end gaming builds.

Skip it if you want a board with clearly stated extras and a longer feature list. It does the basic job at a modest tier. If wireless matters to you, the Prime B550M-A earlier in the list is the easier fit. The ASUS B760M-AYW that follows leaves AMD entirely and offers an Intel path for buyers who prefer it.

ASUS B760M-AYW WiFi D4 II

This is the Intel option in the roundup, aimed at buyers who want the LGA 1700 socket and DDR4 memory. The title lists an Intel B760 chipset, LGA 1700, microATX form factor, PCIe 5.0 x16 support, two M.2 slots, DDR4, Realtek 2.5Gb Ethernet and Wi-Fi 6. Pairing LGA 1700 with DDR4 is a cost-conscious choice when you already own DDR4 modules. The model name even carries a D4 label to flag the memory type, which helps avoid a common mistake. For someone moving from an older Intel build, this board lets the memory carry over while the processor and board change.

• PCIe 5.0 x16 support prepares the graphics slot for future cards.
• 2.5Gb Ethernet and Wi-Fi 6 cover wired and wireless networks.
• DDR4 memory lets you reuse existing modules and keep the build cheaper.

• LGA 1700 is an established socket, so long-term upgrade options are narrower than on AM5.
• Two M.2 slots are enough for most users but not for large drive collections.

Skip it if you prefer AMD or want DDR5. Check processor compatibility with the BIOS version, since some LGA 1700 boards need an update for later chips, and confirm that your cooler mounting suits the socket. The final pick, the ASRock B550M-HDV, returns to AM4 at the simplest end of the group.

ASRock B550M-HDV

The B550M-HDV is the simplest and likely the most budget-minded board here. The title lists an AM4 Micro-ATX board supporting Ryzen 5000, 4000 and 3000 series processors, DDR4 memory up to 4733+ with overclocking, PCIe 4.0 and Gigabit LAN. It does not mention wireless, M.2 count or extra ports in the visible title, so treat it as the bare-bones choice. That makes it suitable for a spare-room computer, a secondary build or a lab machine where cost matters most. The overclocking memory figure of 4733+ is a ceiling that real kits rarely reach, so do not buy on that number.

• It supports a wide span of Ryzen processors on a mature socket.
• PCIe 4.0 is listed, which fits modern graphics cards and fast SSDs.
• Gigabit LAN is standard and enough for most home connections.

• No wireless is mentioned, so wireless users need an adapter.
• The visible title is thin on details, so check the full specifications before buying.

Skip it if you want a premium feature set or the latest platform. It is the lowest-commitment board for a basic AM4 build, and it contrasts with the first pick on the list, the GIGABYTE B550M K, which names more detail on its power design and M.2 slots. Between those two, the extra detail is worth a small premium for most builders.

Why Choose Micro ATX Over ATX or Mini-ITX?

Micro ATX is the middle path between a large ATX board and a cramped mini-ITX one. It fits smaller cases yet keeps the expansion that most home users want, and it usually costs less than a comparable ATX board. The format also keeps airflow simple, since there are fewer cramped corners to trap heat behind the graphics card.

You Want a Compact Case Without Compromises

A micro ATX case saves desk space and still takes a full-size graphics card. Four memory slots are common, and you can add a sound card or a capture card if you need one. Mini-ITX boards demand more care with parts, while micro ATX forgives small mistakes. Cable routing is easier too, with shorter runs to the front panel.

You Are Building on a Sensible Budget

Most buyers never use all the slots on an ATX board. Micro ATX trims the unused ones and keeps the money for the graphics card or storage that affect daily experience. For a gaming PC or a home office machine, it is often the efficient choice. The saved money can go toward a bigger SSD or a better cooler.

You Plan to Upgrade in Stages

A micro ATX board on AM5 or LGA 1700 leaves room for a processor upgrade, extra memory and a second SSD. That staged approach spreads the cost across a year or two instead of one large purchase. It also lets you learn the platform before committing to its high end.

How to Choose

Match the Socket to Your Processor

Socket comes first because it decides everything else. AM4 boards take Ryzen 3000, 4000 G-series and 5000 processors, AM5 boards take Ryzen 7000, 8000 and 9000, and LGA 1700 boards take 12th to 14th generation Intel chips. A mismatch cannot be fixed with a BIOS update. Check the exact processor model against the manufacturer’s support list, since older boards may need a BIOS update to recognize newer chips. If you are unsure, look up the processor’s product page, which names its socket and the compatible chipset families. Do not rely on the board’s size label to guess compatibility, since the same Micro ATX shape appears on all three platforms in this guide.

Memory Type and Slots

AM5 uses DDR5 only, while AM4 and the B760 board here use DDR4. The two are physically incompatible. Two slots handle two sticks of 16GB each, but four slots offer more upgrade room. Look for 32GB as a comfortable target for gaming and multitasking, and treat headline speeds with “OC” attached as best-case numbers that depend on the kit and the processor. Check the maximum supported capacity as well, since entry boards may cap total memory below what the slots suggest, and install sticks in the slots the manual names for dual-channel operation. Two sticks beat four in many cases for stability at higher speeds, so do not fill every slot just because you can.

M.2 Slots and PCIe Generation

Two M.2 slots suit most users, and four suit storage collectors. PCIe 4.0 is plenty for current graphics cards and fast SSDs. PCIe 5.0 matters mainly for the newest SSDs and future cards, so do not pay a large premium for it unless you need it. Check that M.2 slots share bandwidth with SATA ports, which can disable some ports when a drive is installed. Look for a heatsink on the primary M.2 slot too, because fast drives can slow down when they run hot in a tight case. A spare M.2 slot also gives you an easy way to add storage later without touching your existing drive.

Power Delivery

Power phase counts hint at how well the board feeds the processor. A 3+3 layout is fine for a mid-range Ryzen 5, while 12+2+2 or 14+2+1 suits higher-end chips and sustained loads. Phase count alone does not prove quality, since component choice and heat sinks matter too. Match the board tier to the processor tier, and avoid pairing a budget board with the most power-hungry chip. Cooling for the regulator area matters in compact cases, so look for heat sinks there and keep a case fan moving air across the board. A processor that stays inside its comfort zone will also run quieter, which counts for a lot in a small room.

Networking and Ports

Wi-Fi 6 or 6E and 2.5G LAN are the modern baseline. A board without wireless is fine if you use a cable, but add the adapter’s cost to the comparison. Count the rear USB ports, check for USB-C, and note video outputs if you use processor graphics. HDMI 2.1 matters for modern displays. USB-C and a fast LAN port are the features buyers tend to appreciate after a year of use, so treat them as value and not decoration.

Where Budget Boards Cut Corners

Entry boards trim heat sinks, rear ports, M.2 slots and fan headers, and they often skip wireless. Many also use fewer power phases and plainer audio. Ignore RGB headers and gaming labels when comparing value, because they cost little to add. Focus on socket, memory type, storage slots and the power design. Fan headers often drop to two on the cheapest boards, which constrains cooling in a compact case with several fans, and front-panel USB-C is frequently missing.

AM4 DDR4 Versus AM5 DDR5 for a New Micro ATX Build

Most buyers in this category choose between a mature, lower-cost AM4 or Intel DDR4 platform and the newer AM5 DDR5 platform. The table compares them using the boards above. Neither path is wrong, but the cost of switching later is the factor most buyers underestimate, because a platform change means a new board, new memory and sometimes a new cooler mount.

When the AM4 Route Still Wins

If you already own DDR4 memory and a Ryzen 3000 or 5000 chip, an AM4 board is the cheapest upgrade. It is also sensible for a school or office computer that will not need the newest speeds. The trade is a shorter future, since the platform has little room left for new processors. A modern graphics card still fits, because PCIe 4.0 remains more than adequate for current cards.

When AM5 Is the Safer Long-Term Bet

For a new build meant to last several years, AM5 offers newer processors, DDR5 memory and a longer upgrade runway. You pay more today for the board and memory, but you avoid a full platform change later. The Intel B760 board sits between the two, offering a mature socket and DDR4 in a cost-conscious package. A newer chipset also tends to bring more USB-C and faster networking as standard, which is worth weighing against the memory cost.

Setup, Compatibility and Upgrade Tips

What to Check Before Buying

Start with the processor you plan to use and confirm it appears in the board’s support list. Check the case: it must support micro ATX, which most ATX cases do, and note the maximum cooler height it allows, because compact cases often limit tall air coolers. Verify the memory type you own or plan to buy. Count the storage drives you intend to install, and check that the board’s M.2 slots and SATA ports match. Look at the rear connectors for the displays and USB devices you use.

What to Upgrade First

On any of these platforms, the fastest wins come from a good graphics card and a fast NVMe drive. Memory capacity is the next step, with 32GB a comfortable level for gaming and multitasking. Upgrading the processor within the same socket is the last step, and it is easier on AM5 than on AM4, where support is nearing its end. A better cooler helps quiet the system, especially in a compact case.

Common Compatibility Traps

The biggest trap is BIOS support: some boards ship with versions that do not recognize newer processors, so check whether a processor update is needed. Another is memory speed, since the headline overclock figure may not run on your kit. Tall coolers and long graphics cards can clash in a compact case. Finally, a board without built-in wireless needs an adapter, and many boards disable certain SATA ports when a second M.2 drive is installed. Keep the board manual handy, because it shows which memory slots to use first and where the front-panel pins go. Update the BIOS before installing a newer processor if the board’s support list says it is required.

Which One Fits Your Situation

Upgrading an Old AM4 Gaming PC

The GIGABYTE B550M K covers a straightforward refresh, with two M.2 slots and PCIe 4.0. If you want wireless included, the ASUS Prime B550M-A WiFi II adds WiFi 6.

Building a New Gaming PC for the Next Few Years

The GIGABYTE B850M Eagle gives AM5, DDR5 and two M.2 slots without the highest cost. If you want a stronger power design, the AORUS Elite is the step up.

A Storage-Heavy Creator or Collector

The ASUS ROG Strix B850-G Gaming WiFi offers four M.2 slots, which is the best fit for anyone who keeps many fast drives.

A Quiet Home Office or APU Build

The MSI PRO B550M-P supports several G-Series processors with built-in graphics, so it suits a simple desktop without a separate card. The ASRock B550M-HDV is the other budget-minded option.

Common Mistakes

• Buying a board before confirming the processor is on its support list.
• Assuming DDR4 and DDR5 can be swapped, when the slots are physically different.
• Paying for PCIe 5.0 and a high phase count in a build that will never use them.
• Forgetting that a board without built-in wireless needs an adapter.
• Trusting overclock memory figures as guaranteed speeds.
• Ignoring the case, cooler height and graphics card length in a compact build.

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Frequently Asked Questions

Is micro ATX good enough for gaming?

Yes. A micro ATX board has the slots most gamers need, including a full-length graphics slot, memory sockets and M.2 storage. The main limit is fewer expansion slots than a full ATX board, which rarely matters in a gaming PC.

Will a micro ATX board fit in an ATX case?

Almost always. ATX cases use standard mounting points that micro ATX boards share, but you should confirm that the case lists micro ATX support. The reverse, putting an ATX board in a micro ATX case, does not work.

Should I buy an AM4 or AM5 board today?

Choose AM4 if you already own DDR4 memory and a compatible Ryzen chip, because it is the cheapest upgrade. Choose AM5 for a new build where you want newer processors and a longer upgrade path.

Do I need built-in Wi-Fi on the motherboard?

Only if you cannot use a cable. A board with built-in Wi-Fi saves the cost and the USB port of an adapter. If your PC sits near the router, a wired connection is steadier anyway.

How many M.2 slots do I need?

Two is enough for most people, one for the operating system and one for games or files. Choose a board with more only if you work with large media libraries or want to avoid external drives.

What does the power phase count tell me?

It hints at how many stages feed the processor, so higher numbers suit more demanding chips. It does not prove quality by itself, because heat sinks and components matter too. Match the board to your processor tier.

Final Words

A good micro ATX board is the one whose socket, memory type and storage slots match the parts you are actually buying. For a fresh build, the B850M Eagle and AORUS Elite give the best long-term footing, while the ROG Strix suits storage-heavy builders. For upgrades, the B550M K and the Prime B550M-A keep an AM4 system alive at modest cost. Read the support list, count your drives, and treat marketing labels as decoration. The right board disappears into the build and simply works. Choose the one whose weak points you can accept, and spend the saved budget on the parts you will notice every day.