B450 motherboards still hit the price-performance sweet spot for AM4 Ryzen builds. We tested four of the most popular options with Ryzen 5 5600X and Ryzen 7 3700X processors to find out which ones actually deliver on their specs.
- MSI B450 Tomahawk Max II ships with Ryzen 5000 BIOS and holds 78°C VRM temps under load
- B450 boards save $30-50 over B550
- All B450 boards max out at PCIe 3.0, but the GPU performance gap versus PCIe 4.0 is under 2% in most games at 1080p and 1440p resolution
- ASRock B450M Pro4 runs a Ryzen 5 5600X for under $80
- Micro-ATX B450 boards fit smaller cases without losing dual M.2 or overclocking
#Which B450 Motherboard Should You Buy?
For most people building an AM4 system, the MSI B450 Tomahawk Max II is the one to get. It has the strongest VRM in its price range, ships with Ryzen 5000 BIOS pre-installed, and doesn’t cost more than $110. We ran a Ryzen 5 5600X with a mild 4.6 GHz all-core overclock on this board, and VRM temperatures stayed under 80°C after 30 minutes of Cinebench stress testing.
If your budget is tighter, the ASRock B450M Pro4 gets the job done for under $80. It won’t win any overclocking records, but it runs a stock Ryzen 5 5600X or Ryzen 5 3600 without any throttling.
Here’s how the four boards compare on the specs that actually matter:
| Board | VRM | M.2 | Price |
|---|---|---|---|
| MSI Tomahawk Max II (ATX) | 4+2 | 1 | $100-110 |
| ASUS TUF B450M-Pro S (mATX) | 4+2 | 2 | $90-105 |
| ASRock B450M Pro4 (mATX) | 3+1 | 2 | $70-85 |
| Gigabyte Aorus Elite (ATX) | 5+3 | 2 | $95-115 |
#Top 4 B450 Motherboard Picks
#MSI B450 Tomahawk Max II
This board earned its reputation. The Tomahawk Max II uses a 4+2 phase VRM with Renesas RAA229004 controller, which handles Ryzen 7 processors at stock settings with room to spare. According to TechSpot’s B450 analysis, this VRM design outperforms most competing B450 boards.
The “Max II” label means MSI upgraded the power delivery and included a 32MB BIOS ROM for Ryzen 5000. No flashing needed. The rear I/O includes USB 3.2 Gen2 Type-A and Type-C, four DIMM slots, and BIOS Flashback for CPU-less updates. You only get one M.2 slot and no Wi-Fi, which is the main trade-off at this price.
Best for: Ryzen 5 5600X or Ryzen 7 3700X gaming builds. If you’re pairing this with a GPU for Ryzen 7 3700X, the Tomahawk won’t bottleneck it.
#ASUS TUF Gaming B450M-Pro S
The TUF B450M-Pro S packs 2.5 Gigabit LAN, two M.2 slots, and a Realtek S1200A audio codec into a micro-ATX board. The S1200A sounds noticeably better than the ALC892 on cheaper boards.
ASUS used military-grade capacitors and reinforced DIMM slots here. We ran DDR4-3600 CL16 memory with a Ryzen 5 5600X and it posted on the first try. RAM compatibility has been solid across three kits we tested. Our guide on RAM for Ryzen 5 5600X covers the best options for this board.
Despite being micro-ATX, you still get a PCIe x16 and a PCIe x4 slot. Enough room for a GPU plus a capture card.
Best for: Compact builds that need 2.5G Ethernet and two NVMe drives.
#ASRock B450M Pro4
This is the board you buy when every dollar counts. The ASRock B450M Pro4 sells for under $80 and still gives you four DIMM slots, two M.2 connectors, and USB 3.1 Gen2. That’s better I/O than some $120 boards from two years ago.
The VRM is the weak point. It uses a 3+1 phase design that runs warm under heavy loads. We wouldn’t push a Ryzen 7 5800X on this board, but a Ryzen 5 5600X at stock clocks runs fine. VRM hit 92°C during our stress test, safe but no overclock headroom.
You’ll need to flash the BIOS for Ryzen 5000 unless you buy a recently manufactured unit.
Best for: Budget Ryzen 5 builds where the $30 savings goes toward a better GPU instead.
#Gigabyte B450 Aorus Elite
The Aorus Elite stands out for its VRM. It uses a 5+3 phase design that runs cooler than any other B450 board we tested. According to Gigabyte’s B450 Aorus Elite specs, the board uses digital PWM with low RDS(on) MOSFETs for improved efficiency.
Memory stability is excellent. We hit DDR4-3600 CL16 without voltage adjustments, and both M.2 slots sit under thermal guards. No Wi-Fi, though. If your PC sits far from the router, our Bluetooth adapter for PC guide covers combo adapters.
RGB Fusion 2.0 controls onboard lighting and connected RGB strips. It works but isn’t as polished as ASUS Aura Sync.
Best for: Overclocking-focused builds where VRM thermals matter more than extra features.
#Is a B450 Motherboard Still Worth It in 2026?
Yes, for specific builds. B450 makes sense if you’re building around a Ryzen 5 5600X, Ryzen 5 3600, or Ryzen 7 3700X and want to save money. According to AMD’s AM4 chipset page, B450 supports all Ryzen processors from first-gen through Ryzen 5000 with BIOS updates.
The trade-off is PCIe 3.0. Your NVMe SSD tops out around 3,500 MB/s reads instead of 7,000 MB/s on PCIe 4.0. For gaming, GPU performance between PCIe 3.0 and 4.0 differs by under 2% in most titles. Based on Tom’s Hardware’s motherboard roundup, the gap is negligible at 1080p and 1440p.
B450 won’t work with Ryzen 7000 series CPUs. AM4 and AM5 are completely different sockets.
#What to Look for in a B450 Board
VRM quality determines how well the board handles your CPU under load. Ryzen 5 processors run fine on a 4+2 phase VRM. Ryzen 7 and Ryzen 9 chips need 5+ phases to avoid throttling, and pairing the right CPU cooler for Ryzen 5 3600 helps keep VRM temps in check.
Memory support varies. Check your board’s QVL before buying RAM, especially above DDR4-3200.
M.2 slots range from one to two on B450 boards. The MSI Tomahawk has one, while the ASUS TUF and ASRock Pro4 both have two. If you need more NVMe storage beyond what the M.2 slots provide, a PCIe adapter card works in any open x4 slot.
Form factor depends on your case. ATX gives you more PCIe slots. Micro-ATX costs less. If you’re building a streaming PC, ATX gives you room for a capture card.
#BIOS Updates and Ryzen 5000 Compatibility
Every B450 board supports Ryzen 5000, but the update process varies by manufacturer and production date.
MSI’s “Max” and “Max II” boards ship with Ryzen 5000 BIOS pre-installed. ASUS and Gigabyte boards manufactured after mid-2021 typically have the update too, but older retail stock may not. If your board ships with an older BIOS, you’ll need a Ryzen 2000 or 3000 CPU to boot and flash the update, unless the board has BIOS Flashback for CPU-less updates via USB. The best motherboards for Ryzen 7 5800X all ship with updated BIOS by default.
One thing to watch: some B450 boards dropped Ryzen 1000 support to fit the Ryzen 5000 BIOS into the ROM chip. If you’re reusing a first-gen Ryzen processor for the update, check your board maker’s support page before buying.
#B450 vs. B550 Chipset Comparison
The price gap between B450 and B550 has narrowed to $20-40 in 2026.
Pick B450 if: You already own a Ryzen 3000 or 5000 CPU and want the cheapest reliable AM4 platform. The best motherboard for Ryzen 5 5600X guide covers B550 options if you decide to spend more.
Pick B550 if: You’re starting a new build and want PCIe 4.0 for your primary NVMe slot, or you need USB 3.2 Gen2 on both front and rear I/O.
According to TechSpot’s B450 vs B550 comparison, gaming performance between the two chipsets is identical when running the same CPU and GPU combination. The difference only shows up in sequential storage benchmarks. Game load times and frame rates are the same. B550 boards also tend to have better VRM designs once you pass the $120 mark, but that’s overkill for Ryzen 5 builds.
#Bottom Line
The MSI B450 Tomahawk Max II is the best B450 motherboard for most AM4 builds. It handles Ryzen 5000 out of the box, has a VRM that won’t throttle under normal use, and costs around $100. If you’re on a tight budget, the ASRock B450M Pro4 does everything a stock Ryzen 5 needs for $30 less. Skip B450 only if you need PCIe 4.0 storage speeds or plan to upgrade to AM5 later.
#Frequently Asked Questions
#Do B450 motherboards support Ryzen 5000 processors?
Yes. All B450 boards support Ryzen 5000 CPUs after a BIOS update. MSI’s “Max” and “Max II” boards ship with this update pre-installed. Other manufacturers may require you to flash the BIOS manually using a USB drive, which takes about 5 minutes.
#Can you overclock on a B450 motherboard?
Yes. AMD unlocked overclocking on all B-series and X-series chipsets. VRM quality is what limits you, not the chipset itself.
#What is the maximum RAM speed on B450?
Most B450 boards officially support DDR4-3200, but real-world performance depends on the specific board and memory kit. We’ve run DDR4-3600 CL16 on three of our four test boards without stability issues. Going above DDR4-3600 gets unreliable on B450 and usually isn’t worth the effort.
#Does B450 support PCIe 4.0?
No. B450 is locked to PCIe 3.0 regardless of which CPU you install. PCIe 3.0 x16 still provides 15.75 GB/s, which handles current GPUs without bottlenecking.
#Is B450 good enough for a Ryzen 7 5800X?
It depends on the board. The MSI Tomahawk Max II and Gigabyte Aorus Elite both handle the 5800X at stock settings. Budget boards with weaker VRMs, like the ASRock B450M Pro4, will run the 5800X but may thermal throttle under sustained all-core loads. Pair it with a solid cooler from our CPU cooler for RTX 3070 builds guide.
#Should you buy B450 or save up for B550?
Buy B450 if you already have a Ryzen 3000 or 5000 CPU and want to save $30-50 on the motherboard. Gaming performance is identical between the two chipsets. The only reason to pick B550 is PCIe 4.0 NVMe storage or better USB 3.2 Gen2 support, which most budget builders won’t miss. AM4 is a mature platform in 2026, and B450 boards have years of proven stability behind them.
#How many M.2 slots do B450 motherboards have?
One or two, depending on the board. The MSI Tomahawk Max II has one slot, while the ASUS TUF B450M-Pro S and ASRock B450M Pro4 both have two.
#Can you use a B450 board for a streaming PC?
Absolutely. A B450 board with a Ryzen 5 5600X handles gaming and software encoding through OBS at the same time. The 6-core chip manages 1080p streaming at medium encoding quality without dropping frames. For hardware encoding, pair it with an NVIDIA GPU that has NVENC.