Acer’s Predator X39 OLED is a curved gaming monitor with an ultra-wide 3440×1440 120Hz display. I take a look.

Lifting the monitor out of the box, I was surprised by just how tight of a curve it has. The panel’s 800mm radius is tighter than that of other curved monitors and works well with a 39-inch screen. I’m not overly fond of curved screens, but I could get used to this one, especially when playing games.

The V-shaped VESA stand is a hefty beast for a hefty monitor. It takes up a little too much desk real estate for my liking, but the inconvenience is offset by the amount of adjustment that the stand affords you. You can raise and lower the monitor by 110mm, twist it by about 30 degrees and tilt it by about the same. It also twists a bit on the horizontal axis, which would only be useful if your desk were horrendously tilted. The compromise with this level of adjustment is that the monitor will wiggle about a bit on the stand. The standard VESA mounting allows for easy wall mounting of the monitor or the use of an alternative third-party desk stand.

The X39 has a DisplayPort socket and two HDMI sockets. The monitor can also function as a USB hub and has KVM functionality for sharing your keyboard, display and mouse between two PCs. There are two USB Type-A connectors and one USB Type-C display/90W PD connector to the rear of the monitor. At the front, next to the on-screen display (OSD) menu button, is another USB Type-A connector, a USB Type-C connector (with 90W power delivery), and an audio out.

The OLED panel provides vivid colours and uncompromising blacks, no matter what angle you view it from. The touted HDR400 is better than nothing, but at a peak brightness of 400 nits, it is only just HDR. It does have 10-bit colour depth and 99% DCI-P3 coverage, which means the monitor has a high colour range- 99% of the DCI-P3 colour gamut, so there’s less chance of noticeable colour banding.

HDR in the Windows environment is as janky as you’d expect, but things look much better if you set the colour to DCI. It’s when playing games, though, that HDR and the high colour range really comes into its own.

There are several preset display modes to select from, or you can customise the monitor’s colour and brightness settings to your preference. However, when using HDR mode, these options are greyed out in the OSD. There are also a few game modes, including a zoom function for snipers and timers.

The monitor’s variable refresh rate technology is compatible with AMD FreeSync Premium Pro, and although not mentioned in the documentation, I also found it works with Nvidia G-Sync. The monitor supports up to 240Hz refresh rate and feels very smooth. Acer claims that the panel has a 0.01ms response time, as demonstrated by the lack of any smearing or ghosting.

The monitor has built-in speakers, which just about do the job. You’ll probably still need to invest in a pair of decent desktop speakers or use a headset, though.

Unfortunately, the review monitor had a dead pixel in the top third of the left side of the monitor. In 2025, nobody should be staring at a dead pixel on a $1,500 new monitor screen, and Acer agree. In Australia and New Zealand, Acer will replace any monitor that is found to have either a bright or dark dot defect within 7 days of the purchase date.

My main monitor is a 42” 4K HDR panel from Aorus. It’s not the best, with a bit of shadowing, especially in HDR, but text is a darn sight nicer than that of the X39, which took me back to the days of my old 1024×768 CRT monitor. The monitor’s low pixel density makes staring at text during productivity tasks a bit unpleasant at first, until you get used to it. It’s a common complaint with OLED panels, which tend to lend themselves to gaming and watching videos rather than spreadsheets and word processing. I found the likes of Photoshop and even the CAD program, Sketchup, both looking pretty good on the display, though.

My initial misgivings I had with the monitor disappeared as soon as I started playing games.

Playing Assassin’s Creed Shadows is amazing on the monitor, the game’s stunning vistas looking epic across the ultra-wide display. The deep blacks and finely graded colours give the game a more realistic look. The monitor’s high refresh rate, translating to a high frame rate, made the game feel smooth and responsive.

The recently released Stellar Blade is the definitive edition on PC compared the PlayStation 5 version, with ultra-wide monitor support. The wider display gives the action more depth and the game’s post-apocalyptic broken Earth looking even more detailed with the monitor’s wide colour range.

Microsoft Flight Simulator is afforded an extra level of realism with the Predator X39.  The ultra-wide display extends the cockpit view across your peripheral vision. It allows virtual pilots to take in more of the instrument panel and the world outside.

The huge screen can also function as two monitors in one. Writing this review, I have my text in Word open on one side of the monitor with my images open in Photoshop on the other side. Comparing data and checking websites, whilst working on a document, makes things easier on the wide display.

The Acer Predator X39 OLED is a gaming monitor, and it excels at the task. There are some shortcomings when using it for more mundane task, but nothing you won’t be able to get used to. The panel’s size, with its ultra-wide display, gives games an epic feel and the colours a more realistic look. If you are mainly going to use it for gaming, with only occasional use for productivity tasks, the Acer Predator X39 OLED is easy to recommend.