KKVMChecker
Configuration guide

MacBook Air M4 + gaming PC + dual 4K monitors

How to switch an M4 MacBook Air and gaming PC across two 4K60 displays without falling into the macOS Multi-Stream Transport (MST) mirroring trap.

Computer 1M4 MacBook Air
Computer 2Gaming PC
Displays2 × 4K60
ConnectionUSB-C plus PC video
Power60W minimum
Main riskMac dual-display topology

The practical answer

Use a Mac-aware dual-display path. The cleanest current match uses two USB-C ports on the MacBook Air, avoiding Multi-Stream Transport (MST) and DisplayLink. A Thunderbolt-oriented alternative works at dual 4K60, but its 60W charging may not cover heavy sustained loads.

Product assessments

These statuses apply to this exact configuration, not to the product in every possible setup.

Compatible

AV Access iDock M10

Compatible based on published specifications

What this means for you: Two USB-C host connections provide two native display streams on supported MacBook Air models, with 100W charging and monitor-setting retention (EDID).

Displays
2
Video connections
2 × USB-C for Mac / HDMI 2.0 / DisplayPort 1.2a
Published 4K ceiling
Single 60Hz · multi 60Hz
USB-C laptop charging
100W

High dynamic range (HDR): not confirmed · Variable refresh (VRR): not confirmed · Keeps monitor settings (EDID): supported

Product-specific limits
  • Native dual extended displays use two USB-C ports on a supported MacBook.
  • 3440×1440 is limited to 60Hz and a 5120×1440 display falls back to 3840×1080.
  • The Windows host still needs suitable display outputs for both monitors.
  • high dynamic range (HDR) and variable refresh support are not confirmed in the published specification.
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Compatible with limitations

TESmart TKS202-X4

Compatible with stated limitations

What this means for you: The Thunderbolt-oriented path supports dual 4K60, but charging is limited to 60W and the Windows side needs the stated HDMI arrangement.

Displays
2
Video connections
Thunderbolt 4 / USB-C
Published 4K ceiling
Single 120Hz · multi 120Hz
USB-C laptop charging
60W

High dynamic range (HDR): not confirmed · Variable refresh (VRR): not confirmed · Keeps monitor settings (EDID): supported

Product-specific limits
  • The manufacturer states that actual resolution and refresh depend on the computers, displays, cables and system configuration.
  • Charging is limited to 60W per compatible computer.
  • high dynamic range (HDR) and variable refresh support are not confirmed in the published specification.
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Not compatible

TESmart HDC202-P23

Not supported by published specifications

What this means for you: Its single-cable laptop path relies on Multi-Stream Transport (MST), so macOS normally mirrors the two external displays.

Displays
2
Video connections
USB-C (DP Alt Mode with Multi-Stream Transport (MST)) / HDMI / DisplayPort
Published 4K ceiling
Single 60Hz · multi 60Hz
USB-C laptop charging
60W

High dynamic range (HDR): not confirmed · Variable refresh (VRR): not confirmed · Keeps monitor settings (EDID): supported

Product-specific limits
  • The USB-C laptop path relies on Multi-Stream Transport (MST), so most Macs mirror rather than extend two displays.
  • Laptop charging is up to 60W.
  • 4K output is limited to 60Hz.
  • high dynamic range (HDR) and variable refresh support are not confirmed in the published specification.
View product

Compatibility constraints

  • The M4 MacBook Air must be configured to support two external displays in the intended lid-open or lid-closed mode.
  • Do not assume a single USB-C Multi-Stream Transport (MST) feed creates two independent macOS desktops.
  • Budget for two suitable host-to-KVM video paths and certified 4K cables.

Recommended setup sequence

  1. Confirm the exact M4 MacBook Air external-display mode.
  2. Connect each Mac display stream separately or use the supported Thunderbolt topology.
  3. Connect the gaming PC with one video feed per display.
  4. Test wake, hot-key switching and desktop position retention before final cable management.

Technical term unclear? See KVM terms explained for plain-English definitions and practical consequences.

Sources checked

The primary documents supporting the decisive compatibility claims on this page.

Related configurations

MacBook Air M4 + gaming PC + 4K144 monitor Mac dual extended displays through a KVM Thunderbolt 4 KVM for Mac + Windows PC

Sources last checked 12 August 2026. Products were not physically tested by KVMChecker. Firmware, host hardware, adapters and cables can change the result.