Keychron J2 vs Newmen GM840 Pro
Choose the Keychron J2 for its QMK support and stated 1000 Hz polling rate, while the Newmen GM840 Pro is the lighter listed option.
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Which one should you get?
Get the
Keychron J2
Battery
Build quality in the top 40% of 75% boards under $100.
- 1000 Hz polling rate is listed for the J2.
- Supports QMK and VIA, with Keychron Launcher for key remapping and macros.
- Lists Bluetooth, 2.4 GHz, and wired connectivity, with Bluetooth connections to up to three devices described by Keychron.
Get the
Newmen GM840 Pro
Build quality in the bottom 5% of 75% boards under $100.
- Listed weight is 747 g.
- Supports Bluetooth, 2.4 GHz, and wired Type-C connections, according to the vendor description.
- Vendor describes 5-pin hot-swappable switches and custom RGB effects.
Pick the Keychron J2 if QMK or VIA support, remapping, and the stated 1000 Hz polling rate matter most. Choose the Newmen GM840 Pro if its lower listed weight and custom RGB effects better suit your priorities. Both provide a 75% ANSI layout, wireless and wired connections, PBT keycaps, and hot-swap support.
The differences that matter
Skip the 40-row spec sheet. These are the specs that change how each board feels, sounds, and fits your desk.
Keychron J2
Newmen GM840 Pro
Battery
3,750 mAh
2,000 mAh
A larger battery means fewer cables during the day
Switch options
Clicky, Linear, Tactile
Clicky, Linear
QMK
Yes
No
The deep option when you want to remap every key
VIA
Yes
No
GUI remapping without compiling firmware
Media keys
Yes
No
- Keychron J2
- Newmen GM840 Pro
- Performance
- 6948
- Build quality
- 7140
- Productivity
- 7362
- Customizability
- 8654
- Portability
- 7376
- Layout size: 75%
- Connection: Bluetooth, 2.4 GHz, Wired
- Hot-swappable
- Sound dampening
- Keycaps: PBT
What will you mostly use it for?
The J2 leads for gaming, office tasks, programming, modding, and content creation, mainly due to its stated polling rate, firmware options, and remapping features. The GM840 Pro has the travel edge on its lower listed weight, although the J2 has the larger listed battery capacity. Both share a compact ANSI layout, three connection types, hot-swap support, and PBT keycaps, keeping the decision centered on the extra controls and customization offered by the J2.
Pick the Keychron J2
- The J2 lists a 1000 Hz polling rate, while no polling rate is listed for the GM840 Pro.
- Keychron describes Last Key Priority as supporting quicker directional changes in games.
- Both keyboards offer 2.4 GHz connectivity and RGB lighting.
Keychron J2 vs Newmen GM840 Pro specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
7 of 20 specs differ
Keychron J2
Newmen GM840 Pro
Switch options
Hot-swappable
Sound dampening
Layout size
Layout standard
Ergonomics
Display
Media keys
Connection
Max polling rate
Battery
USB-C
Case material
Keycaps
Weight
Dimensions
Backlight
QMK
VIA
Released
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Keychron J2 vs Newmen GM840 Pro: your questions
The Keychron J2 lists a 1000 Hz polling rate and QMK and VIA support. The Newmen GM840 Pro is listed at 747 g and its vendor describes custom RGB effects and 5-pin hot-swap support.
The J2 is the more clearly specified gaming choice because its metadata lists a 1000 Hz polling rate. Keychron also describes Last Key Priority for quicker directional changes, while both keyboards offer 2.4 GHz connectivity and RGB lighting.
Yes, the J2 metadata lists both QMK and VIA support. Keychron also describes using its Launcher web app for key remapping and macros.
The GM840 Pro's listed extra features do not include QMK support. Its vendor description highlights hot-swappable switches, RGB customization, and three connection modes instead.
Both list hot-swap support. Keychron says the J2 hot-swappable version accepts almost all 3-pin and 5-pin MX-style switches, while the GM840 Pro vendor description specifies a 5-pin design.
The GM840 Pro is listed at 747 g, while the J2 vendor specification lists 808 g. That makes the GM840 Pro the lighter of the two on the available weight listings.
The J2 metadata lists a 3750mAh battery, compared with 2000mAh for the GM840 Pro. Keychron's vendor page separately lists 4000 mAh for the J2, so check the product variant or listing before buying.
Yes, both list Bluetooth and 2.4 GHz connectivity, as well as wired use. Keychron describes the J2 as pairing with up to three devices over Bluetooth, while the GM840 Pro vendor description says it supports multiple devices.
Both list PBT keycaps. Keychron describes the J2's caps as double-shot PBT, and the GM840 Pro vendor description identifies its caps as dye-sublimed PBT.
The J2 offers hot-swap support along with QMK and VIA, and Keychron describes Launcher remapping and macro features. The GM840 Pro also supports switch replacement, with its vendor specifying a 5-pin hot-swap design.
Both list RGB lighting and sound-dampening features. Keychron describes multiple acoustic foam layers for the J2, while the GM840 Pro vendor specifies high-density muffling pads.
The J2 is the stronger fit for users who want firmware-level customization, since it lists QMK and VIA and Keychron describes remapping and macros. Both are ANSI 75% keyboards with hot-swappable switches.
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