Under a $100 ceiling, the motherboard’s job is to deliver the features that matter — a solid chipset, the right socket, decent VRMs and modern connectivity — while skipping the premium extras that inflate the price. Spend wisely here and the savings go straight into a better CPU, GPU or more RAM, where they make a far bigger difference. Every board in this guide targets AMD’s AM4 platform, still one of the best value foundations you can build on, and each comes in at or under the $100 mark.
Our picks were chosen on what genuinely matters at this budget: chipset capability (B550 for PCIe 4.0 and overclocking headroom versus A520 for essentials only), VRM and build quality for the price, connectivity such as M.2, USB and WiFi, and overall value. We have included a spread — from around $64 to right at the $100 ceiling — so you can match the board to your CPU and ambitions. The list spans feature-rich micro-ATX and ATX B550 boards and lean A520 options for the tightest builds. Below is an at-a-glance comparison of all six, then a closer look at each and a buyer’s guide to spending a sub-$100 motherboard budget well.
Best Motherboards under $100 at a Glance
| Motherboard | Best For | Standout Spec | Approx Price |
|---|---|---|---|
| MSI B550M PRO-VDH WiFi | Best value with WiFi | B550, micro-ATX, built-in WiFi | around $100 |
| Gigabyte B550 Gaming X V2 | Full ATX B550 value | B550 ATX, PCIe 4.0, dual M.2 | around $92 |
| Gigabyte A520M K V2 | Cheapest capable board | A520 micro-ATX, M.2, budget | around $64 |
| Gigabyte B550 Gaming X V2 (ATX) | Ryzen 5000 ATX upgrade | B550 ATX, Ryzen 5000 ready | around $90 |
| Gigabyte A520M S2H | Compact essentials build | A520 micro-ATX, HDMI/D-Sub | around $70 |
| ASUS Prime B550M-A WiFi II | Feature-rich micro-ATX | B550, WiFi 6, PCIe 4.0 | around $90 |
1. MSI B550M PRO-VDH WiFi ProSeries Motherboard (AMD AM4, DDR4)
MSI B550M PRO-VDH WiFi ProSeries Motherboard (AMD Ryzen 5000, AM4, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 1, Wi-Fi, Bluetooth, D-SUB/HDMI/DP, Micro-ATX)
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The MSI B550M PRO-VDH WiFi is our best-value pick at the $100 ceiling because it packs the most useful features into the budget. It is a B550 micro-ATX board for AM4 Ryzen (including 5000-series) with DDR4 support, PCIe 4.0, an M.2 slot and — crucially at this price — built-in WiFi. At around $99.99 it sits right at the limit and earns it.
For a sub-$100 build, the B550 chipset is the smart foundation: it supports PCIe 4.0 for fast NVMe and modern GPUs and allows CPU overclocking, unlike the entry A520. Adding integrated WiFi means you do not need a separate adapter, which is a genuine cost saving and a tidiness win. With reliable MSI build quality and the headroom to run a capable Ryzen CPU, the B550M PRO-VDH WiFi is the board to beat under a hundred dollars.
Pros: B550 chipset, PCIe 4.0, built-in WiFi, Ryzen 5000 ready, the most features at the ceiling.
Cons: Micro-ATX limits expansion slots; single M.2 on a tight budget.
2. Gigabyte B550 Gaming X V2 Motherboard (AM4, 4x DDR4)
Gigabyte B550 Gaming X V2 Motherboard (AM4/4xDDR4/HDMI/DVI-D/USB 3.2/M.2)
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The Gigabyte B550 Gaming X V2 is the full-ATX value pick, giving you the larger form factor and expansion of an ATX board while staying under budget. It is a B550 board for AM4 with four DDR4 slots, PCIe 4.0, dual M.2 support and a generous port selection including USB 3.2. At around $92 it is a lot of motherboard for the money.
This is the pick for a builder who wants room to grow: four RAM slots for up to high-capacity dual-channel kits, two M.2 slots for fast NVMe storage now and later, and the full ATX layout’s extra PCIe slots and headers. The B550 chipset brings PCIe 4.0 and overclocking support, and Gigabyte’s VRM design comfortably handles mainstream Ryzen CPUs. If you value expansion and a full-size board without breaking the $100 ceiling, the B550 Gaming X V2 is an excellent value choice.
Pros: Full ATX, B550 with PCIe 4.0, four DDR4 slots, dual M.2, strong value.
Cons: No built-in WiFi; you supply a card or use Ethernet.
3. Gigabyte A520M K V2 Motherboard (AM4, 2x DDR4)
Gigabyte A520M K V2 Motherboard (AM4/2xDDR4/HDMI/D-Sub/M.2/USB 3.2)
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The Gigabyte A520M K V2 is the cheapest capable board here, and at around $64 it is built to stretch the tightest budgets. It is an A520 micro-ATX board for AM4 with two DDR4 slots, an M.2 slot, HDMI and D-Sub outputs and USB 3.2. It covers the essentials of a working AM4 system at a rock-bottom price.
Be clear about the trade-off: the A520 chipset is the entry tier, so it omits PCIe 4.0 and CPU overclocking and offers fewer lanes than B550. That is fine for a value build pairing a modern Ryzen with a mainstream GPU where you have no plans to overclock. The M.2 slot still gives you fast SSD storage, and the board is reliable and compact. If your goal is the lowest-cost route to a stable AM4 system and you do not need PCIe 4.0, the A520M K V2 delivers.
Pros: Lowest price here, A520 with M.2, compact micro-ATX, reliable essentials.
Cons: A520 means no PCIe 4.0 and no CPU overclocking; only two RAM slots.
4. GIGABYTE B550 Gaming X V2 AMD AM4 ATX Motherboard (Ryzen 5000/4000/3000)
Prime GIGABYTE B550 Gaming X V2 AMD AM4 ATX Motherboard, Supports Ryzen 5000/4000/3000 Series Processors, DDR4, 10+3 Power Phase, 2X M.2, PCIe 4.0, Front USB-C, GbE LAN, Q-Flash Plus, RGB Fusion
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This GIGABYTE B550 Gaming X V2 ATX listing is the pick for a clear Ryzen 5000 upgrade path on a full-size board. It is a B550 ATX motherboard that explicitly supports Ryzen 5000, 4000 and 3000 series CPUs, with PCIe 4.0, multiple DDR4 slots and M.2 storage. At around $90 it is a dependable foundation for a current-gen AM4 build.
The intent here is a straightforward, capable ATX platform for a Ryzen 5000 CPU without overspending. The B550 chipset unlocks PCIe 4.0 for fast NVMe and modern graphics cards and supports overclocking, the ATX layout gives you expansion headroom, and broad CPU compatibility means flexibility if you source a chip from an earlier generation. For builders centring a system on a Ryzen 5000 processor who want a proven ATX B550 board under $100, this is a solid, no-surprises choice.
Pros: B550 ATX, explicit Ryzen 5000 support, PCIe 4.0, expansion-friendly layout.
Cons: No onboard WiFi; feature set is value-focused rather than premium.
5. GIGABYTE A520M S2H Motherboard (AMD Ryzen 5000, AM4)
GIGABYTE A520M S2H Motherboard - Supports AMD Ryzen 5000 Series AM4 Processors, 4+3 Phase Pure Digital VRM, Up to 5100MHz DDR4 (OC), PCIe 3.0 x4 M.2, GbE LAN, USB 3.2 Gen 1
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The GIGABYTE A520M S2H is the compact essentials pick, a clean micro-ATX A520 board for a no-frills AM4 build. It supports AMD Ryzen 5000-series processors on the AM4 socket, with DDR4 memory, an M.2 slot, and both HDMI and D-Sub outputs for flexible display connectivity. At around $70 it is an affordable, reliable base.
Like the other A520 board here, the trade-off is the entry chipset: no PCIe 4.0 and no overclocking, which is perfectly acceptable for a value system that will not be pushed beyond stock. Its strengths are simplicity and compatibility — Ryzen 5000 support, an M.2 slot for a fast boot drive, and dual display outputs that suit CPUs with integrated graphics. If you want a small, dependable, low-cost board for a straightforward Ryzen build, the A520M S2H fits neatly.
Pros: Compact A520 micro-ATX, Ryzen 5000 support, M.2 slot, HDMI and D-Sub outputs.
Cons: Entry A520 chipset: no PCIe 4.0, no overclocking, limited expansion.
6. ASUS Prime B550M-A WiFi II AMD Micro ATX Motherboard (PCIe 4.0, WiFi 6)
ASUS Prime B550M-A WiFi II AMD Micro ATX Motherboard with PCIe 4.0, WiFi 6, ECC Memory, HDMI 2.1, RGB Header
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Rounding out the list is the ASUS Prime B550M-A WiFi II, a feature-rich micro-ATX board that brings premium touches in under budget. It is a B550 micro-ATX board for AM4 with PCIe 4.0, WiFi 6, ECC memory support and ASUS’s well-regarded BIOS and reliability. At around $90 it offers a strong feature set for the price.
This is the pick for the builder who wants modern connectivity without stepping over $100: WiFi 6 is built in, PCIe 4.0 is ready for fast NVMe and current GPUs, and the B550 chipset supports CPU overclocking. ASUS’s Prime line is known for a clean, stable BIOS that makes tuning and updates straightforward, and ECC support is an unusual bonus at this tier. For a compact, well-connected and dependable B550 board under a hundred dollars, the Prime B550M-A WiFi II is a standout.
Pros: B550 with PCIe 4.0, WiFi 6, ECC support, trusted ASUS BIOS, lots for the price.
Cons: Micro-ATX limits expansion; sits near the top of the budget.
How to Choose a Motherboard under $100
The chipset is the single most important decision under a $100 ceiling, because it defines what your build can and cannot do. On AMD AM4, B550 is the value sweet spot: it supports PCIe 4.0 for fast NVMe SSDs and modern GPUs, and it allows CPU overclocking. The A520 chipset, by contrast, drops PCIe 4.0 and overclocking and offers fewer lanes — fine for a stock value system, but a real limitation if you want headroom. Decide which tier matches your ambitions before anything else.
Match the socket and CPU support carefully so the board actually runs the processor you plan to buy. Every board here is AM4 and supports Ryzen 5000-series chips, which remain superb value, but always confirm the specific CPU is on the supported list and whether a BIOS update is needed. Getting the socket and support right is non-negotiable — a cheap board is no bargain if it will not boot your chosen CPU, so verify compatibility before you order.
Look next at connectivity and the features you will actually use, since this is where sub-$100 boards differ most. Built-in WiFi, as on the MSI B550M PRO-VDH WiFi and ASUS Prime B550M-A WiFi II, saves the cost and clutter of a separate adapter. Count the M.2 slots if you want multiple NVMe drives — the ATX B550 Gaming X offers dual M.2 — and check USB ports and display outputs match your needs. Prioritise the connectivity you will use and do not pay for what you will not.
Finally, balance form factor and VRM quality against your budget. Micro-ATX boards like the MSI and ASUS Prime suit compact builds, while full ATX boards such as the B550 Gaming X give more expansion slots and headers. A board’s VRM (power delivery) should comfortably handle your CPU, and the B550 options here are well-suited to mainstream Ryzen chips. Set your priorities — chipset tier, WiFi, storage, size — and pick the board on this list that puts your money where it counts. Under $100, the best motherboard is the one that gives your build what it needs and skips what it does not.
Frequently Asked Questions
Is B550 or A520 better for a budget build?
B550 is the better value foundation if you can afford it within the budget. It supports PCIe 4.0 for fast NVMe SSDs and modern GPUs and allows CPU overclocking, neither of which A520 offers. A520 boards like the Gigabyte A520M K V2 are cheaper and fine for a stock system with no overclocking plans, but for headroom and faster storage, a B550 board such as the MSI B550M PRO-VDH WiFi is the smarter pick.
Can I run a Ryzen 5000 CPU on these boards?
Yes — every board here is AM4 and supports Ryzen 5000-series processors, which remain excellent value. Always confirm the exact CPU model on the board’s supported list and check whether a BIOS update is required, especially on budget boards. The MSI, Gigabyte and ASUS options listed all explicitly target Ryzen 5000 compatibility for a current-generation AM4 build.
Do I need built-in WiFi on a motherboard?
Only if you cannot use a wired Ethernet connection. Built-in WiFi, as on the MSI B550M PRO-VDH WiFi and ASUS Prime B550M-A WiFi II, is convenient and saves buying a separate adapter, which is valuable at this price. If your desktop is near the router and you can hardwire it, a board without WiFi like the Gigabyte B550 Gaming X saves money you can spend elsewhere.
What can I safely skip on a sub-$100 motherboard?
Premium extras you will not use: heavy RGB, large heatsink shrouds, multiple high-speed USB-C ports, and abundant M.2 slots beyond your needs. Focus the budget on the right chipset, solid VRMs for your CPU, and the connectivity you actually use such as WiFi or a second M.2. Skipping cosmetic and surplus features is exactly how these boards hit a sub-$100 price without compromising the essentials.
Related Guides
- Best Motherboards
- Best AM4 Motherboards
- Best CPUs for Gaming
- Best RAM for Gaming
- Best NVMe SSDs
- Best Budget Gaming PC Builds
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