What is Processor? CPU Cores, GHz, & nm Explained

In today's digital age, smartphones have become an essential part of our daily lives. Often, while using our phones, we wonder about their performance or compare our device's speed with a friend's phone.

You might think, "My friend's phone has an Octa-core processor" or "It uses a Qualcomm Snapdragon chip, which is why it is faster." However, processing speed does not depend solely on the number of cores or the brand of the manufacturer. In this post, we will dive into the complete details of mobile processors: What are they? How do they work? And how should you choose the right processor for your next smartphone?

What is a Mobile Processor (CPU)?

Whatever command you give to your mobile device, the processor is responsible for understanding and executing it. To understand this easily, let's use an analogy: If your smartphone is a human body, the processor is its brain.

The processor pays attention to your inputs and follows your commands. The faster the processor, the smoother your multitasking, gaming, and photo/video editing will be. Officially known as the Central Processing Unit (CPU), its performance is measured by its "Clock Speed" in Gigahertz (GHz). Today, most smartphones feature processors ranging from 1.5 GHz to over 3.0 GHz.

Top Manufacturers of Mobile Processors

The global smartphone market is primarily powered by processors from these major manufacturers:

1) Qualcomm (Snapdragon)

Qualcomm's Snapdragon chips are the most popular in the market and are generally divided into different tiers:

• 400 Series: Designed for budget and entry-level smartphones.
• 600 Series: Built for reliable mid-range smartphones.
• 700 Series: Targeted at premium mid-range phones with excellent gaming capabilities.
• 800 Series (and Snapdragon 8 Gen series): Built for flagship, high-end smartphones requiring maximum power.

2) Exynos (Samsung)

Exynos processors are manufactured by Samsung and are primarily used in Samsung Galaxy devices. They are highly optimized for power efficiency and strong performance, usually available in Quad-core or Octa-core variants.

3) MediaTek

MediaTek processors are widely used in budget and mid-range smartphones. Recently, their "Helio" and high-end "Dimensity" series have become incredibly popular for delivering flagship-level gaming performance at a lower cost.

4) NVIDIA (Tegra)

NVIDIA processors were designed with a "4+1" core architecture (4 cores for normal use and 1 low-power core for battery standby). Coming from a PC graphics background, these chips were renowned for their heavy graphics and gaming performance.

5) Intel Atom

Intel Atom processors were based on x86 architecture. While they are rarely used in modern smartphones (formerly seen in older devices like the Asus Zenfone), they played an important role in mobile processing history.

How to Actually Compare Smartphone Processors

When comparing processors, most people only look at the number of cores or the brand name. However, that is not the correct way to compare them. The actual speed and capability of a mobile processor depend on four critical factors:

1. Architecture

Before comparing two processors, you must look at their architecture. Architecture is the foundational design of the processor, typically provided by a company called ARM. ARM licenses these designs (like Cortex-A53, Cortex-A78, or Cortex-X series) to chip manufacturers. A processor built on the latest ARM architecture will always be more powerful and efficient than an older one.

2. Technology (Nanometer Size)

Processors contain billions of microscopic transistors. The speed and efficiency of a processor depend heavily on the size of these transistors, measured in Nanometers (nm). The smaller the transistor, the better the processor.

If a chip uses a 3nm or 4nm fabrication process, the transistors are packed closer together. This means data travels faster, and the chip generates less heat and consumes less battery compared to an older 12nm or 14nm processor.

3. Number of Cores

Next, you should check how many cores the processor has. Cores act as independent hands completing tasks:

• Dual-core: 2 cores
• Quad-core: 4 cores
• Hexa-core: 6 cores
• Octa-core: 8 cores

More cores mean better multitasking. However, remember that having 8 cores doesn't automatically make a phone fast if the architecture is outdated and the nanometer size is large.

4. Frequency / Clock Speed (GHz)

The final factor is Frequency. Every processor has an internal clock measured in Gigahertz (GHz). If a processor has a frequency of 2.0 GHz, it means that the chip can process 2 billion cycles (instructions) in just one second. Assuming the architecture and nanometer size are similar, a processor with a higher GHz will process data faster than one with a lower GHz.

Conclusion: The next time you buy a new phone, do not just fall for the "Octa-Core" marketing trap. Check its Architecture, verify the Transistor size in Nanometers (nm), and look at the Clock Speed (GHz) to find the truly fastest phone!