3.5 Given a scenario, install and configure motherboards, central processing units (CPUs), and add-on cards.
📘CompTIA A+ Core 1 (220-1201)
Motherboard compatibility is a critical exam topic. When installing or upgrading a CPU, the technician must make sure the processor and motherboard are compatible.
The most important compatibility factors are:
- CPU socket type
- CPU manufacturer (AMD or Intel)
- Single-socket vs multi-socket motherboards
If these do not match correctly, the system will not power on or function.
1. CPU Socket Types
A CPU socket is the physical connector on the motherboard where the processor is installed.
Why CPU Socket Type Matters
- Each CPU is designed for one specific socket type
- A CPU cannot be installed into the wrong socket
- The motherboard must support:
- The socket type
- The CPU generation
- The chipset
On the exam, socket compatibility is usually tested in upgrade or replacement scenarios.
2. AMD CPU Socket Types
AMD (Advanced Micro Devices, Inc.) processors use their own socket designs.
Intel CPUs cannot be installed in AMD sockets.
Common AMD Socket Types (Exam-Relevant)
AM4
- Used for many Ryzen processors
- Supports desktop systems
- Supports DDR4 memory
- Very common in exam questions
AM5 (Newer)
- Used for newer Ryzen CPUs
- Supports DDR5 memory
- Not backward compatible with AM4 CPUs
Key Exam Points for AMD
- AMD CPUs typically use PGA (Pin Grid Array)
- Pins are located on the CPU
- The socket has holes for the pins
- CPU must be aligned using a triangle marking
⚠️ For the exam:
Never mix AMD CPUs with Intel motherboards
3. Intel CPU Socket Types
Intel processors require Intel-specific sockets.
Intel frequently changes socket designs between CPU generations.
Common Intel Socket Types (Exam-Relevant)
LGA 1200
- Used for older Intel Core CPUs
- Supports DDR4 memory
LGA 1700
- Used for newer Intel Core CPUs
- Supports DDR4 or DDR5 (depends on motherboard)
Key Exam Points for Intel
- Intel CPUs use LGA (Land Grid Array)
- Pins are located on the motherboard socket
- The CPU has flat contact pads
- Socket damage is common if pins are bent
⚠️ Exam Tip:
- Intel CPUs do not have pins
- Bent pins = motherboard replacement
4. AMD vs Intel – Exam Comparison
| Feature | AMD | Intel |
|---|---|---|
| Socket type | AM4, AM5 | LGA 1200, LGA 1700 |
| Pin location | On CPU | On motherboard |
| Socket compatibility | Limited by generation | Limited by generation |
| Cross-compatibility | ❌ No | ❌ No |
On the exam:
- Never install Intel CPU into AMD socket
- Never install AMD CPU into Intel socket
5. Multisocket Motherboards
A multisocket motherboard supports more than one CPU installed at the same time.
Where Multisocket Systems Are Used
- Enterprise servers
- Data centers
- Virtualization hosts
- Database servers
These systems are not common in home PCs.
Key Characteristics of Multisocket Motherboards
- Support 2 or more identical CPUs
- CPUs must be:
- Same manufacturer
- Same model
- Same speed and architecture
- Designed for parallel processing
- Use server-grade CPUs (e.g., AMD EPYC, Intel Xeon)
⚠️ Exam Warning:
- Desktop CPUs do not work in multisocket boards
- Consumer CPUs cannot share workloads across sockets
Multisocket Exam Scenarios
You may be asked:
- Which motherboard is best for high availability
- Which system supports multiple CPUs
- Which setup is used in enterprise servers
Correct answer:
- Multisocket motherboard
6. CPU and Motherboard Compatibility Checklist (Exam Focus)
Before installing a CPU, always check:
- CPU manufacturer (AMD or Intel)
- Socket type matches motherboard
- CPU generation supported by chipset
- BIOS supports the CPU
- Single-socket vs multisocket requirement
If any of these do not match:
- System will not boot
- Hardware may be damaged
7. Common Exam Mistakes to Avoid
❌ Assuming same brand CPUs fit all boards
❌ Ignoring socket type
❌ Mixing AMD and Intel components
❌ Using desktop CPUs in multisocket systems
❌ Forgetting BIOS compatibility
8. What You Must Remember for the Exam
✔ CPU and motherboard must have matching socket types
✔ AMD and Intel are not interchangeable
✔ Intel uses LGA (pins on motherboard)
✔ AMD uses PGA (pins on CPU)
✔ Multisocket boards are for enterprise servers only
Exam Success Tip
If the question mentions upgrading a CPU, always check the socket type first.
If it mentions enterprise or server environments, think multisocket motherboards.
