What is a CPU?

The CPU, or Central Processing Unit, is often referred to as the brain of the computer. It handles instructions, calculations, system management, and communication between all other hardware components.

Every action performed on a computer passes through the CPU in some form.

This includes:

• Launching programs

• Running Windows

• Processing game logic

• Managing physics calculations

• Handling background tasks

• Communicating with hardware

While the GPU focuses mainly on graphics, the CPU controls the overall operation of the system.

Cores & Threads

Modern CPUs contain multiple cores.

A core is essentially an individual processor capable of handling tasks independently.

Older processors often had only two or four cores, while modern CPUs may contain:

• 6 cores

• 8 cores

• 12 cores

• 16 cores or more

Many CPUs also use threads, which allow each core to work on multiple tasks simultaneously.

More cores and threads generally improve:

• Multitasking

• Productivity workloads

• Rendering

• Streaming

• Heavy background processing

Clock Speed

Clock speed refers to how quickly a CPU can process instructions.

This is measured in GHz (Gigahertz).

For example:

• 3.5 GHz

• 4.2 GHz

• 5.0 GHz

Higher clock speeds can improve performance, particularly in games that rely heavily on single-core performance.

However, clock speed alone does not determine how powerful a CPU is. Architecture, efficiency, cache size, and core design also matter significantly.

What is CPU Cache?

CPU cache is extremely fast memory built directly into the processor.

It stores frequently used data close to the cores so the CPU can access it rapidly without constantly requesting information from slower system RAM.

Modern CPUs typically contain:

• L1 cache

• L2 cache

• L3 cache

Larger cache sizes can improve gaming and workload performance in certain scenarios.

Some modern gaming-focused CPUs, such as AMD X3D processors, use extremely large cache designs specifically to improve gaming performance.

CPU Generations & Naming

CPU naming can appear confusing at first.

For example:

• Intel Core i5

• Intel Core i7

• Intel Core i9

• AMD Ryzen 5

• AMD Ryzen 7

• AMD Ryzen 9

The number after the product line usually refers to the generation or model tier.

However, just like GPUs, newer does not always mean faster in every situation.

A well-balanced modern mid-range CPU can often outperform older flagship processors while using less power and producing less heat.

What does the CPU do in Games?

In gaming, the CPU handles:

• Game logic

• AI behaviour

• Physics calculations

• NPC processing

• Background systems

• Input processing

• Communication with the GPU

Some games rely heavily on the CPU, especially:

• Simulation games

• Strategy games

• Large multiplayer environments

• Flight simulators

Some games rely heavily on processor performance, particularly simulation, strategy, and large multiplayer titles.

Balanced systems generally perform better than systems where one part heavily outclasses the others.

If the CPU cannot keep up with the GPU, it creates what is known as a CPU bottleneck.

CPU Cooling

CPUs generate heat while operating and require cooling systems to remain stable.

More powerful CPUs typically require stronger cooling solutions, especially under heavy workloads.

Insufficient cooling can lead to thermal throttling, where the processor reduces performance to prevent overheating.

**please see cooling guide for more details**

How Many CPU Cores Do You Need?

4 Cores

Suitable for:

• Very basic systems

• Office work

• Lightweight gaming

6 Cores

Currently considered the minimum recommendation for modern gaming systems.

Provides solid performance for most users.

Often considered the ideal balance for gaming and multitasking.

Excellent for:

• Gaming

• Streaming

• General productivity

• Content creation

8 Cores

12+ Cores

Primarily beneficial for:

• Professional rendering

• Heavy multitasking

• Workstation use

• Advanced production workloads

Many games still do not fully utilise extremely high core counts.

Final Thoughts

The CPU is the control centre of the entire computer. It affects responsiveness, multitasking, system stability, and gaming performance.

For gaming PCs:

• Mid-range CPUs often provide the best value

• Extremely expensive processors may offer diminishing returns

• Balance matters more than chasing the highest numbers

A strong CPU paired with the right GPU, adequate cooling, fast storage, and sufficient RAM creates a system that feels smooth, responsive, and capable across every task.