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.
Evidence last checked 12 August 2026. Specifications assessed, not physically tested.
Manufacturer confirmed stated in a primary sourceInferred derived conservatively from published specificationsUnresolved the exact combination is not provedEvidence policy
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).
Computers
2
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.
Evidence behind this assessment
8 recorded claims are manufacturer-confirmed, 1 are conservative inferences and 2 remain unresolved. Product evidence last checked 12 August 2026.
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.
Computers
2
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.
Evidence behind this assessment
6 recorded claims are manufacturer-confirmed, 1 are conservative inferences and 2 remain unresolved. Product evidence last checked 12 August 2026.
What this means for you: TESmart documents a two-USB-C macOS path that supplies two independent display signals on Macs that natively support two external displays. It supports dual 4K60 and up to 60W charging through Input A, but requires two Mac USB-C connections.
Computers
2
Displays
2
Video connections
2 × USB-C (DP Alt Mode; single-cable Multi-Stream Transport (MST) on Windows or dual-cable macOS) / HDMI 2.0 / DisplayPort 1.2
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
Windows can use the single-cable Multi-Stream Transport (MST) path; macOS requires two USB-C host connections for two independent extended displays.
The Mac itself must natively support two external displays; the KVM cannot bypass the computer display-count limit.
Laptop charging is up to 60W through Input A; the second Mac USB-C connection is used for the additional display signal.
4K output is limited to 60Hz.
high dynamic range (HDR) and variable refresh support are not confirmed in the published specification.
Evidence behind this assessment
7 recorded claims are manufacturer-confirmed, 0 are conservative inferences and 2 remain unresolved. Product evidence last checked 22 August 2026.
Sources last checked 12 August 2026. Products were not physically tested by KVMChecker. Firmware, host hardware, adapters and cables can change the result.
