The question of whether 120hz is the same as 120fps is one of the most persistent misunderstandings in modern display technology. While the numbers look similar, they describe fundamentally different aspects of the visual experience, and confusing the two can lead to frustration when setting up a gaming rig or home theater. Understanding the distinction is the first step toward making informed decisions about your next monitor, television, or gameplay capture setup.
Defining the Core Concepts
To clear up the confusion, it is essential to break down what each term actually measures. Hz, or hertz, is a unit of frequency that refers to the refresh rate of a display—the number of times per second the screen can redraw its image. When you see a monitor rated at 120hz, it means the screen is capable of refreshing 120 times every second, regardless of what content is being sent to it. On the other hand, frames per second (fps) is a measure of the performance of the source device, such as a game console or PC, describing how many individual images, or frames, it is generating every second. The relationship between the two is analogous to the difference between the capacity of a pipeline and the flow rate of water within it.
The Frame Rate Explained
Frames per second is a measurement of the content being produced. In the context of gaming or video production, it reflects the computational power of the hardware responsible for creating the moving image. A higher fps generally results in smoother motion and a more responsive feel, particularly in fast-paced action sequences. When a game runs at 120fps, it is generating 120 unique images every second. If this content is played back on a display with a lower refresh rate, such as 60hz, the display physically cannot show all of those frames, often resulting in screen tearing or the engine limiting the output to match the panel’s capabilities.
The Refresh Rate Explained
Refresh rate, expressed in hertz, is a property of the display hardware itself. A 120hz monitor has the physical ability to show 120 different images in a single second. If the incoming signal is 30fps, the monitor will simply display the same frame multiple times to fill its refresh cycle. The primary benefit of a high refresh rate is the reduction of motion blur and the creation of a more fluid visual experience. However, the refresh rate cannot create detail that does not exist in the source material; it can only display the information it is given as accurately and smoothly as possible.
Why the Confusion Persists
The misconception that 120hz equals 120fps likely stems from marketing and ideal scenarios. Monitor manufacturers often advertise high refresh rates to appeal to gamers, while game developers highlight high frame rates to showcase performance. In a perfect world with no bottlenecks, these numbers would match, creating a scenario where a 120hz display is fed 120fps of content. However, in real-world usage, the number displayed on the screen is the result of a chain of variables, including the graphics card, the game settings, the cable used for transmission, and the processing technology like V-Sync or G-Sync. Therefore, the numbers are merely two parts of a much larger equation.
Practical Implications for Gamers
For the gaming community, understanding the difference between these two metrics is critical for optimizing performance. If a player owns a high-end 120hz monitor but their graphics card is only producing 60fps, the visual result will look identical to playing on a 60hz monitor, albeit with potentially higher input lag due to the monitor waiting for data. Conversely, if a powerful PC is generating 144fps but the monitor is capped at 60hz, the excess frames are discarded, creating a scenario known as "wasted horsepower." To truly benefit from a high refresh rate display, the source device must consistently produce content at or near the monitor’s maximum capacity.
