AMD B650 or AMD X670
Prefer the cheaper B650 board when it already has the slots and ports you need. X670 changes expansion capacity, not CPU or memory performance.
The decision
Which one to buy
AMD B650
Choose B650 if the exact board already has the M.2 slots, SATA ports and USB you need: it takes the same AM5 processors and memory.
AMD X670
Choose X670 if your parts list needs more drives or add-in cards than a B650 board holds: up to 8 SATA ports and 44 usable PCIe lanes, against 4 and 36.
Cheapest new B650 board at Newegg: $89.81. Cheapest new X670 board: $239.96, $150.15 more. Prices checked 31 October 2026, before tax and shipping.
The comparison
What differs
3 of 7 fields differ. Both sides of every row come from a published manufacturer document, cited on the row itself, with what the difference does once the parts are in a case.
| Field | AMD B650 | AMD X670 | What the difference does |
|---|---|---|---|
| Graphics link | PCIe 4.0 x16; board makers may add optional capabilitiesamd.com | PCIe 4.0 x16 or x8/x8amd.com | A single graphics card gets the same specified PCIe generation on B650 and X670; X670 is useful here only for a board that actually wires bifurcated slots you will use. |
| Nvme link | Up to PCIe 5.0 x4 is optional; PCIe 4.0 x4 is the baselineamd.com | PCIe 5.0 x4 plus four general-purpose PCIe lanesamd.com | X670 guarantees a broader processor-side storage arrangement, but a B650 board with the M.2 sockets you need produces no practical difference for most builds. |
| Expansion io | 36 usable PCIe lanes total, up to 4 SATA ports, up to 1 USB 20Gbps and 6 USB 10Gbps36 total usable lanesamd.com | 44 usable PCIe lanes total, up to 8 SATA ports, up to 2 USB 20Gbps and 12 USB 10Gbps44 total usable lanesamd.com | Choose X670 when your parts list really needs its extra chipset I/O, such as many drives or add-in cards; unused lane ceilings change nothing. |
This comparison comes from published specifications, not from testing. We do not test hardware, and we never present a judgment as though we had. Current affiliate offers stay on category pages and do not determine this specification comparison.
In full
The comparison in detail
The decision turns on planned devices. Count M.2 drives, SATA drives, add-in cards, and high-speed USB ports on the exact motherboard. If they fit on B650, the larger X670 ceilings sit unused.
Prices: the two board lists above show every new board of each chipset at Newegg today, with its price. Two boards differ in more than their chipset, so compare the slots and ports you need before you read the gap as the chipset's price. Board makers list their models in catalogs such as ASUS's US motherboard catalog (read 26 July 2026).
| Property | AMD B650 | AMD X670 | What it changes | Evidence |
|---|---|---|---|---|
| Platform support | AM5; Ryzen 7000, 8000, and 9000 support, with a BIOS update potentially required for newer CPUs | AM5; Ryzen 7000, 8000, and 9000 support, with a BIOS update potentially required for newer CPUs | B650 and X670 accept the same AM5 CPU families, so X670 does not unlock a faster class of processor. | B650, X670, Updated 26 July 2026 |
| CPU overclocking | Enabled | Enabled | Either B650 or X670 exposes Ryzen CPU tuning, so an overclocking checkbox alone is no reason to pay for X670. | B650, X670, Updated 26 July 2026 |
| Memory support | Dual-channel DDR5 with AMD EXPO memory overclocking | Dual-channel DDR5 with AMD EXPO memory overclocking | Memory type and EXPO support are equal on B650 and X670; the board layout and memory QVL matter more than the chipset name. | B650, X670, Updated 26 July 2026 |
| Graphics link | PCIe 4.0 x16; board makers may add optional capabilities | PCIe 4.0 x16 or x8/x8 | A single graphics card gets the same specified PCIe generation on B650 and X670; X670 is useful here only for a board that actually wires bifurcated slots you will use. | B650, X670, Updated 26 July 2026 |
| NVMe link | Up to PCIe 5.0 x4 is optional; PCIe 4.0 x4 is the baseline | PCIe 5.0 x4 plus four general-purpose PCIe lanes | X670 guarantees a broader processor-side storage arrangement, but a B650 board with the M.2 sockets you need produces no practical difference for most builds. | B650, X670, Updated 26 July 2026 |
| Expansion I/O | 36 usable PCIe lanes total, up to 4 SATA ports, up to 1 USB 20Gbps and 6 USB 10Gbps | 44 usable PCIe lanes total, up to 8 SATA ports, up to 2 USB 20Gbps and 12 USB 10Gbps | Choose X670 when your parts list really needs its extra chipset I/O, such as many drives or add-in cards; unused lane ceilings change nothing. | B650, X670, Updated 26 July 2026 |
| USB4 | Optional | Optional | Neither B650 nor X670 guarantees USB4, so check the exact rear I/O instead of treating X670 as automatic USB4. | B650, X670, Updated 26 July 2026 |
Where next
Other comparisons
- AMD B650 vs AMD B650EField by field, chipset.
- AMD B850 vs AMD X870Field by field, chipset.
- Intel B760 vs Intel Z790Field by field, chipset.
- Intel Z890 vs Intel B860Field by field, chipset.
- AMD X670 vs AMD X670EField by field, chipset.
- 32GB DDR4-3200 CL16, 2x16GB vs 32GB DDR5-5600 CL36, 2x16GBField by field, memory.