LG UltraGear Evo GX9 39GX950B Review: A Stunning 5K2K OLED Shadowed by a Better Rival

LG's new UltraGear Evo GX9 39GX950B is a 39-inch 5K2K ultrawide OLED that ticks almost every box for high-end PC gaming — but a competing panel from Alienware threatens to steal its thunder before it even gets comfortable.

The 39GX950B runs at 5,120 x 2,160 on a 39-inch diagonal, which works out to 143 DPI — the same pixel density as a 32-inch 4K monitor stretched to 21:9. That's a meaningful step up from older 34-inch ultrawides and makes text and fine detail genuinely crisp. The panel uses LG's Tandem OLED technology, hitting 335 nits full-screen and 1,500 nits peak HDR in a small window, with VESA DisplayHDR True Black 500 certification. Response time is 0.03 ms, native refresh tops out at 165 Hz at 5K2K, and a dual-mode option pushes that to 330 Hz at 1080p in a 24.5-inch windowed mode. Connectivity covers DisplayPort 2.1, two HDMI 2.1 ports, USB-C with 90W Power Delivery, and a USB-A hub. Price is $1,799 in the US and £1,549 in the UK. The warranty, however, is only two years — a notable weak spot for a panel technology that carries burn-in risk.

Here's the catch: LG Display makes two distinct 39-inch 5K2K Tandem OLED panels, and the one inside the 39GX950B uses a different subpixel layout than the other. Alienware's upcoming AW3926QW uses that second panel, which features a true RGB-stripe subpixel structure — generally considered superior for sharpness and text rendering compared to alternative arrangements. That's a significant technical differentiator, and it means the LG's own monitor could be undercut by a display built on LG Display's own glass. Tandem OLED stacks two OLED layers to boost brightness and longevity, and it's the same core technology powering some of the best OLED monitors of the past year, so the fundamentals here are solid — the subpixel question is the specific wrinkle.

The review notes that the built-in AI upscaling feels underbaked, and the two-year warranty is hard to swallow at this price. The bottom line from the reviewer is clear: the 39GX950B is impressive hardware, but anyone seriously considering it should wait to see how the Alienware AW3926QW performs before spending $1,799.