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 them leads to unrealistic expectations when purchasing new hardware. Understanding the distinction is essential for anyone setting up a gaming rig, a home theater, or a professional monitoring station.
Defining Hz: The Monitor's Refresh Rate
Hz, or Hertz, is a unit of frequency that measures how many times per second a display can refresh its image. Specifically, the refresh rate refers to how often the monitor checks for new input and redraws the screen. A 120Hz monitor can refresh its image 120 times every second, regardless of what is happening in the content source. This capability is a hardware feature of the screen itself, determining how smoothly it can handle rapid changes in the image, which is critical for reducing motion blur and screen tearing.
Defining FPS: The Content's Frame Rate
FPS, or Frames Per Second, is a measure of how many individual images, or frames, are produced by the source device in one second. This is a characteristic of the content being played or the game being rendered. A game running at 60FPS is generating 60 unique images every second, while a cinematic film typically runs at 24FPS. The frame rate is determined by the power of the graphics card, the efficiency of the software, and the settings applied to the application.
The Relationship Between the Two
The relationship between the monitor's refresh rate and the content's frame rate creates the visual experience. The monitor acts as a window that can display a certain number of frames within a second. If a game produces 140FPS on a 60Hz monitor, the monitor physically cannot display all 140 frames, leading to a bottleneck. Conversely, if the monitor can display 120Hz but the game only outputs 30FPS, the screen will show only 30 of those possible refreshes. The goal is to match or synchronize these two values for optimal performance.
Why 120hz and 120fps Are Often Confused
The confusion arises because high-refresh-rate monitors are specifically marketed to gamers who want to play games at high frame rates. When a monitor has a 120Hz specification, it implies that it is capable of displaying content generated at that high speed. Furthermore, technologies like G-Sync and FreeSync are designed to bridge the gap by allowing the monitor to dynamically adjust its refresh rate to match the fluctuating FPS output of the game. This close association in the gaming world leads people to mistakenly believe the terms are interchangeable.
The Practical Impact on Gaming and Video
The practical difference becomes clear when observing motion on screen. A 120Hz monitor provides a significantly smoother and more responsive experience than a 60Hz screen, particularly in fast-paced action. If you are playing a game locked at 30FPS, upgrading to 120Hz will not make the game look sharper or increase the detail in the environment. However, it will reduce input lag and make the existing 30FPS movement appear smoother. To truly benefit from a 120Hz display, the content needs to be generated at a high frame rate, ideally 120FPS or close to it.
Summary of Key Differences
To clarify the distinction, the following table outlines the primary characteristics of Hz versus FPS:
Specification | Hz (Refresh Rate) | FPS (Frame Rate)
Definition | The monitor's ability to redraw the screen per second. | The number of individual images generated per second by the source.
