HMX FJ400 vs. Gateron Mars

Overview

When it comes to choosing the right mechanical keyboard switch, the HMX FJ400 and Gateron Mars provide two compelling options for users who prefer linear switches. The FJ400 is renowned for being the middle ground in the HMX Film switch lineup, offering a balanced sound profile that caters to those who seek both performance and a pleasant auditory experience. In contrast, the Gateron Mars switches are distinguished by their innovative design, which combines a POK stem with a housing made from a blend of Nylon and POM, resulting in a unique tactile feel and smooth operation. Both switches are excellent choices for gamers and typists alike; the FJ400 offers a harmonious blend of sound and actuation, while the Mars delivers a distinct and durable feel that can enhance the typing experience. However, let's dive in a bit deeper beyond generalities so you can best decide on the optimal switch for your personal needs.

By the numbers

HMX FJ400 Linear

Gateron Mars Linear

$3.50

$3.29 per 10

$6.10

$5.50 per 10

Learn moreLearn more

Housing materials

When comparing the housing materials of the HMX FJ400 and the Gateron Mars, one finds a striking contrast in terms of both top and bottom housing compositions. The FJ400 utilizes POM (Polyoxymethylene) for its top housing, which is noted for creating a uniquely pleasant sound profile that is deeper and more muted compared to other materials. In contrast, the Mars features a nylon top housing, which is celebrated as a classic choice among mechanical switches due to its ability to produce a fuller, deeper sound profile. The characteristics of each material significantly affect the auditory experience of typing, with POM contributing a more refined sound on the release and nylon offering a softer, more absorbing quality in the key press.

On the bottom housing front, the differences continue. The FJ400 opts for nylon as its bottom housing, which similarly enhances the switch's ability to absorb sound and contribute to a deep, rounded auditory profile. The Gateron Mars, however, employs POM for its bottom housing, which delivers a muted sound when the switch bottoms out. Here, one can see how each switch's auditory experience can be influenced by the interplay of housing materials. The FJ400’s bottom housing provides a significant tactile quality that derives from the softness of nylon, offering a different response compared to the Mars's POM bottom, which may emphasize a more distinct bottom-out sound.

Despite these differences, both switches can achieve a similarly appealing sound profile through the strategic combination of their respective housing materials. The nylon bottom housing of the FJ400 complements the POM top, creating a sound that is both deep and pleasant during key release, while the Mars’s nylon top and POM bottom produce a rich sonic experience as well. In essence, by appropriately pairing these contrasting materials, each switch can reach a harmonized auditory quality that satisfies keyboard enthusiasts, suggesting that the engineering behind each switch is well-designed to create desirable outcomes even with different materials.

Weight

When comparing the HMX FJ400 linear switch and the Gateron Mars linear switch, notable differences arise in their actuation forces. The FJ400 requires an actuation force of 50 grams, while the Mars switch requires a lighter actuation force of 45 grams. This means that the Gateron Mars is better suited for users who prefer a lighter touch, which can enhance comfort during prolonged typing or gaming sessions. In terms of bottom out force, the FJ400 has a measurable bottom out force of 58 grams, indicating a clear resistance felt when the switch is fully pressed down. However, the bottom out force for the Mars switch remains unknown, complicating direct comparisons in this aspect. Overall, those seeking a more substantial typing experience may gravitate towards the medium-weight FJ400, while users who enjoy a lighter feel will likely prefer the Gateron Mars linear switch due to its lower actuation force.

Travel distance

When comparing the travel distances of the HMX FJ400 linear switch and the Gateron Mars linear switch, the FJ400 has a travel distance of 3.8 mm, while the Mars is slightly shorter at 3.6 mm. This difference of 0.2 mm may seem minimal, but it can influence typing feel and response time. The shorter travel distance of the Gateron Mars can cater to gamers and others who favor quicker actuation and enhanced responsiveness, while the HMX FJ400 offers a more pronounced depth that some users might prefer for a satisfying keystroke. Therefore, if you lean towards a more abrupt feel, the Mars would be the better choice, whereas the FJ400 would be ideal for those who appreciate a more robust typing experience.

Price comparison

Typing experience

The sound profile of the HMX FJ400 linear switch is known for its balanced quality, making it suitable for various environments where a pleasant typing experience is desired without being overly disruptive. In contrast, the Gateron Mars linear switch introduces a unique character due to its innovative design, which is said to contribute to a distinct auditory experience. However, the specific sound characteristics of the Mars switch are not extensively documented. It's worth noting that the sound produced by both switches can be significantly influenced by other factors, such as the mechanical keyboard's construction and the choice of keycaps, meaning users may experience variations when switching between setups.

When it comes to feel, the HMX FJ400 is characterized by its smooth keystroke, providing a consistent and enjoyable typing experience that is emblematic of quality linear switches. The Gateron Mars switch, with its POK stem and a housing made from a blend of Nylon and POM, likely offers a tactile experience that may feel slightly different yet still generally smooth, although its exact feel is not specified. Users can expect a satisfying linear feel from both switches, although the nuances in their design may create a distinctive typing sensation, appealing to different preferences.

Overall, while both the HMX FJ400 and Gateron Mars switches fall into the linear category and are designed to provide smooth operation, they each offer their own unique benefits. The FJ400 stands out for its balanced sound profile and known smooth feel, making it an accessible choice for a variety of users. The Mars switch, with its innovative design, presents an intriguing alternative that may surprise in terms of auditory and tactile experience, though specific feedback is less documented. Ultimately, selecting between the two switches may come down to personal preference and the specific qualities a user is seeking in their mechanical keyboard experience.

Conclusion

To conclude, when deciding between the HMX FJ400 and the Gateron Mars linear switches, it ultimately comes down to your personal preferences in terms of feel, sound, and bottom-out force. If you’re looking for a medium-weight switch that offers a balanced sound profile, the FJ400 is an excellent choice. It provides a reliable and consistent typing experience suitable for both casual gaming and typing tasks, appealing to those who prefer a bit of tactile feedback without excessive resistance. On the other hand, if you’re attracted to innovative designs and are curious about experimenting with a switch that features a unique POK stem and a nylon-POM blend housing, the Gateron Mars may be the better option for you, especially if you want to explore a smoother typing experience. However, with the unknown bottom-out force of the Mars, it would be wise to consider whether you're comfortable with that uncertainty in your setup. Thus, evaluate your typing style and preferences carefully so that you can choose a switch that enhances your overall keyboard experience.

Mentioned in this article

HMX FJ400 Linear

$3.50

$3.29 per 10

Learn more

Gateron Mars Linear

$6.10

$5.50 per 10

Learn more