Sony INZONE M9 (SDM-U27M90)
This is what matters about Sony INZONE M9 (SDM-U27M90).
About
A rare 27" monitor with true 96-zone FALD backlighting for decent HDR density — but its internal clocks bifurcate refresh by port: 144Hz over DisplayPort collapses to a hard 120Hz ceiling over HDMI 2.1.
- HDMI version
- 2.1
- DisplayPort version
- 1.4
- Max resolution
- 3840x2160@144Hz
- VRR range
- 24-120Hz
- Requires DisplayLink driver
- No
Ports: 2× HDMI 2.1, 1× DisplayPort 1.4, 1× USB-C, 1× USB-B, 3× USB-A and 1× Audio 3.5mm
Confirmed with
- Notebook (generic)
144Hz is only reachable via DisplayPort — the HDMI 2.1 controller rigidly caps refresh at 120Hz. Its HDMI circuitry is also unusually sensitive to latency fluctuation, with users reporting strobing flicker and signal loss when running high-def eARC audio simultaneously with VRR gaming.