Is your CPU compatible with your motherboard?
Reviewed and updated August 30, 2026
Start with the CPU and motherboard socket. Then check BIOS and DDR4 or DDR5 memory before buying. Use the quick examples below, then confirm the exact CPU model on the motherboard manufacturer's support list.
Check my CPU and motherboard →Popular compatibility examples
Ryzen 5 9600X + B650
Potentially compatible. Check the exact B650 board CPU-support list and required BIOS version before installation.
Ryzen 7 9800X3D + B650
Compatible platform and chipset combination, but an older board may need a BIOS update for this exact CPU.
Core Ultra 5 245K + LGA1700
Not compatible. The processor uses LGA1851 and cannot fit an LGA1700 motherboard.
1. Match the CPU socket
Start with the socket in the official processor specification. Common examples include AMD AM4 and AM5, plus Intel LGA1700 and LGA1851. A processor cannot be installed in a different socket even when the product names appear similar.
2. Check the chipset and exact CPU model
The correct socket is necessary but does not confirm support. Open the motherboard manufacturer's CPU-support page, search for the complete processor name and note the minimum BIOS version shown beside it.
3. Confirm the BIOS before assembly
A motherboard produced before a newer CPU launched may need an update before it can boot. BIOS Flashback can allow an update without an already-supported processor, but availability and procedure vary by exact motherboard.
4. Match DDR4 or DDR5 memory
The motherboard accepts only the memory generation printed in its specification. DDR4 modules do not fit DDR5 slots. Some Intel processor families have motherboard options for either generation, but each individual motherboard still uses only one.
5. Check motherboard size and power delivery
Confirm that ATX, Micro-ATX or Mini-ITX fits the case. For higher-power processors, also check VRM capability, power connectors and cooling instead of choosing a board only because the socket matches.
CPU compatibility checklist
- CPU and motherboard use the same socket.
- The exact CPU appears on the motherboard support list.
- The installed BIOS meets the listed minimum version.
- The RAM generation matches the motherboard.
- The motherboard size fits the case.
- The board has suitable power delivery for the intended workload.
Frequently asked questions
Does the same CPU socket guarantee compatibility?
No. The socket must match, but the motherboard chipset and installed BIOS must also support the exact CPU model.
Does Ryzen 5 9600X work with a B650 motherboard?
Ryzen 5 9600X uses socket AM5. Many B650 motherboards can support Ryzen 9000 processors, but you must check the exact board CPU-support list and required BIOS version.
Does Ryzen 7 9800X3D work with B650?
Ryzen 7 9800X3D uses AM5 and AMD lists B650 among its supporting chipsets. The exact motherboard may still require a newer BIOS.
Can Intel Core Ultra 5 245K use an LGA1700 motherboard?
No. Intel lists the Core Ultra 5 245K for FCLGA1851, so it cannot be installed in an LGA1700 motherboard.
Can a DDR5 CPU use DDR4 memory?
Memory support depends on both the processor platform and the exact motherboard. DDR4 and DDR5 modules are physically different and cannot share the same slot.
Official specification references
AMD Ryzen 7 9800X3D specifications · AMD AM5 chipset information · Intel Core Ultra 5 245K specifications
Select your exact CPU
PCNavo updates the motherboard and memory choices when you change processor platforms.