Compare Redragon CASTOR K631 HE vs FIZZ K617 Differences Side by Side

This comparison is for budget-conscious buyers deciding between Redragon's advanced gaming technology and its more traditional, customizable offering. The CASTOR K631 HE promises high-end features like Hall Effect switches and rapid trigger, while the FIZZ K617 focuses on a compact layout and hot-swap sockets. The decision hinges on whether you prioritize raw, adjustable performance for competitive gaming or the flexibility to change switches and a smaller footprint.

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Main differences	Released in 2026 Has Magnetic switch options Available in a 65% layout Built with the ANSI layout standard Utilizes Hall effect sensors Enables rapid trigger functionality Runs at a 8000 Hz polling rate Weighs about 638 g Sized at 33 x 323 x 107 mm	Released in 2021 Has Linear, Clicky switch options Supports hot-swappable switches Available in a 60% layout Built with the ANSI, ISO-DE, ISO-ES, ISO-FR, ISO-IT, ISO layout standard Features N-key rollover Uses a Bottom Mount mounting style Weighs about 590 g Sized at 38 x 99 x 36 mm
Score	Scores Performance: 91.4 Build Quality: 42.2 Productivity: 47 Customizability: 45.8 Portability: 65.1	Scores Performance: 70 Build Quality: 54.9 Productivity: 52.3 Customizability: 56.3 Portability: 69.7
Name	Name Redragon CASTOR K631 HE	Name Redragon FIZZ K617
Release year	Release year 2026	Release year 2021
Switch Options	Switch Options Magnetic	Switch Options Linear, Clicky
Profile	Profile Normal Profile	Profile Normal Profile
Hot Swappable	Hot Swappable	Hot Swappable
Layout Size	Layout Size 65%	Layout Size 60%
Layout Standard	Layout Standard ANSI	Layout Standard ANSI, ISO-DE, ISO-ES, ISO-FR, ISO-IT, ISO
Layout Ergonomics	Layout Ergonomics Normal	Layout Ergonomics Normal
Knob Support	Knob Support	Knob Support
Display Support	Display Support	Display Support
Mac/Win Support	Mac/Win Support	Mac/Win Support
Multi-Media Keys	Multi-Media Keys	Multi-Media Keys
USB-C	USB-C	USB-C
USB passthrough	USB passthrough	USB passthrough
Connection	Connection Wired, Wired only	Connection Wired, Wired only
Polling Rate	Polling Rate 8000 Hz	Polling Rate -
Battery capacity	Battery capacity -	Battery capacity -
Hall Effect Support	Hall Effect Support	Hall Effect Support
QMK Support	QMK Support	QMK Support
VIA Support	VIA Support	VIA Support
VIAL Support	VIAL Support	VIAL Support
N-Key Rollover	N-Key Rollover	N-Key Rollover
Rapid Trigger	Rapid Trigger	Rapid Trigger
Mount Style	Mount Style -	Mount Style Bottom Mount
Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers
Sound Dampening	Sound Dampening	Sound Dampening
Backlight	Backlight Rgb	Backlight Rgb
Case Colors	Case Colors	Case Colors
Case Material	Case Material Plastic	Case Material Plastic
Keycaps Material	Keycaps Material -	Keycaps Material -
Dimensions	Dimensions 33 x 323 x 107 mm	Dimensions 38 x 99 x 36 mm
Weight	Weight 638g	Weight 590g

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Pros and Trade-offs

Your primary need dictates the choice. If your goal is to gain every possible advantage in competitive titles like Valorant or Apex Legends, the Redragon CASTOR K631 HE's Hall Effect switches and 8K polling are compelling, despite less flexibility for physical mods. If you want a compact keyboard to save space and enjoy experimenting with different switch types without soldering, the hot-swappable Redragon FIZZ K617 is the more practical and budget-friendly option.

Redragon CASTOR K631 HE

+Features Hall Effect magnetic switches with a claimed longer lifespan.
+Includes Rapid Trigger technology for adjustable actuation points.
+Offers a high 8000 Hz polling rate for reduced input latency.
+Software allows for dual actions on a single key based on actuation pressure.
+Comes with a portable strap, spare switches, and a switch puller.

−Uses proprietary Hall Effect switches, limiting standard hot-swap customization.
−Lacks a confirmed hot-swappable socket for switch compatibility.
−Heavier at 638g compared to the FIZZ K617.

Redragon FIZZ K617

+Hot-swappable sockets support both 3-pin and 5-pin mechanical switches.
+More compact 60% layout saves desk space.
+Slightly lighter weight at 590g.
+Vendor description mentions quiet linear red switches for a less noisy experience.
+Often available at a lower price point.

−Lacks dedicated arrow keys due to the 60% layout.
−Does not feature Hall Effect switches or Rapid Trigger technology.
−Polling rate is not specified, so high-performance gaming latency is unclear.

Which Keyboard Is Better for Your Needs?

The CASTOR K631 HE is the clear choice for serious gamers who want the advantages of Hall Effect technology and ultra-high polling rates. For typists and programmers, its arrow keys give it an edge over the more compact FIZZ K617. However, the FIZZ K617 wins for portability due to its smaller 60% size and is the definitive pick for modders thanks to its hot-swap sockets. For general office use or content creation, the trade-offs are more balanced, making either a viable option depending on layout preference.

GamingRedragon CASTOR K631 HE

•Features Hall Effect magnetic switches with adjustable actuation points via software.
•Includes Rapid Trigger technology for dynamic activation and deactivation.
•Offers a native 8000 Hz polling rate for lower latency input.

OfficeTie

•Both are wired-only, plastic keyboards with RGB backlighting.
•The CASTOR K631 HE's 65% layout includes arrow keys, which the FIZZ K617's 60% layout lacks.
•The FIZZ K617's listing mentions quiet linear red switches, which may be preferable in shared spaces.

ProgrammingRedragon CASTOR K631 HE

•The 65% layout retains dedicated arrow keys, which are often used in code navigation.
•Its software allows for assigning macros and complex key functions.
•The larger layout may be more comfortable for long typing sessions compared to a 60% board.

TravelRedragon FIZZ K617

•The FIZZ K617 is a 60% layout, making it more compact than the 65% CASTOR K631 HE.
•It is slightly lighter at 590g compared to 638g.
•Both include a detachable USB-C cable for easier packing.

ModdingRedragon FIZZ K617

•Explicitly listed as hot-swappable with sockets compatible with 3-pin and 5-pin switches.
•The vendor description encourages switch swapping for modding fun.
•The CASTOR K631 HE comes with Hall Effect switches, which are not typically hot-swappable with standard mechanical switches.

Content CreationTie

•Both support software for macro programming, useful for application shortcuts.
•Both have RGB lighting for aesthetic setups.
•Neither offers wireless connectivity, which can limit desk cable management for clean filming setups.