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Head to head · Prices checked Oct 23, 2026

Yunzii KC84 SP vs Jamesdonkey RS2 4.0

Get the Jamesdonkey RS2 4.0 for knob and qmk.

What actually differs

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.

Yunzii KC84 SP

Jamesdonkey RS2 4.0

  • Connection

    Wired

    Bluetooth, 2.4 GHz, Wired

  • Case material

    Plastic

    Aluminum

  • Switch options

    Clicky, Linear, Tactile

    Linear

  • Knob

    No

    Yes

  • QMK

    No

    Yes

KeebFinder scores

How we score
  • Yunzii KC84 SP
  • Jamesdonkey RS2 4.0
Performance
71
58
Build quality
49
71
Productivity
61
93
Customizability
64
82
Portability
46
53

What they share

  • Hot-swappable
  • Keycaps: PBT
See every spec side by side

Full specs

Yunzii KC84 SP vs Jamesdonkey RS2 4.0 specs

Every tracked spec, side by side. Rows marked with a dot differ between the boards.

10 of 22 specs differ

Yunzii KC84 SP

Jamesdonkey RS2 4.0

Typing & switches

Switch options

Clicky, Linear, Tactile
Linear

Hot-swappable

Yes
Yes

Mount style

—
Gasket Mount

Sound dampening

No
Yes

Layout

Layout size

—
96%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

No
Yes

Display

None
None

Media keys

No
Yes

Connectivity & battery

Connection

Wired
Bluetooth, 2.4 GHz, Wired

Battery

Wired only
4,000 mAh

USB-C

Yes
Yes

Build & materials

Case material

Plastic
Aluminum

Keycaps

PBT
PBT

Weight

—
1,150 g

Dimensions

27 x 320 x 135 mm
34 x 405 x 138 mm

Backlight

RGB
RGB

Firmware & software

QMK

No
Yes

N-key rollover

Yes
No

Mac & Windows

Yes
Yes

Extras

Released

2025
2024

Where to buy

Compare prices

Live prices from the stores we track, cheapest in-stock offer first.

Lowest price across stores, Amazon excluded.

  • AmazonGlobal

    Check price
    ~$89Visit
  • YunziiCN

    Out of stock
    $89Visit
  • MechkeysCN

    In stock
    $99Visit
  • AmazonGlobal

    Check price
    ~$99Visit
  • WhatGeekCN

    Out of stock
    $108Visit

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