Asus unveils 12.3-inch touchscreen side monitor for gaming setups

Asus is betting that the second-screen boom can be more than a desk-side novelty. The ROG Strix XG129C, introduced Friday, is a 12.3-inch touchscreen IPS monitor meant to sit beside a larger main display and handle the jobs that eat into gaming time: live-stream chat, system monitoring, Discord, guides and quick-access controls.

The pitch is familiar, but Asus is trying to make it more practical. The XG129C uses a 24:9 panel with 1920 x 720 resolution, 75Hz refresh and 10-point capacitive touch. Asus says the ultra-slim display is designed to reduce black bars and present 16:9 video in a more usable layout than a similarly sized 32:9 screen. It also includes a sliding kickstand and a 1/4-inch tripod socket, giving it more placement options under a primary monitor or on a separate mount.

That puts Asus squarely in the same lane as Corsair’s XENEON EDGE, a 14.5-inch secondary touchscreen that Corsair says is built for system monitoring, streaming chat, quick-access widgets and use as an additional monitor. Corsair launched that display in August 2025, and Asus is now answering with a slightly smaller panel that leans harder into desk integration. The comparison matters because this category is still trying to prove it solves a real workflow problem rather than merely creating another accessory to buy.

Asus is also drawing on its own earlier hardware. The ROG Zephyrus Duo 15, introduced in April 2020, placed a 14.1-inch secondary display in the keyboard area, signaling that the company has been testing the value of a built-in side screen for years. The XG129C is the detachable version of that idea, aimed at setups where a full second monitor would be too large or too awkward.

The company is backing the screen with software and monitoring tools. Asus includes a one-year subscription to AIDA64 Extreme, exclusive ROG SensorPanel themes for real-time hardware monitoring, and support for ASUS DisplayWidget Center and ASUS Control Panel for virtual dials and sliders. Connectivity includes USB-C with DisplayPort Alt Mode and power delivery, plus HDMI. With 125% sRGB, 90% DCI-P3, 300 nits brightness and a 1200:1 contrast ratio, the XG129C is clearly built for utility first.

That leaves the core question intact: who really needs a second screen this size? Streamers and creator-focused gamers are the obvious buyers, especially if they want chat, stats and controls visible without giving up main-screen game space. For everyone else, Asus still has to prove that a 12.3-inch side monitor is a necessity, not just the latest way to crowd a desk.