LG UltraFine 40U990A 39.7" Silver 2025

The LG UltraFine 40U990A pairs a 5120 x 2160 120Hz panel with 99th percentile connectivity, including Thunderbolt 5 with 96W power delivery. It's a productivity powerhouse for MacBook Pro owners and content creators. Just don't expect gaming monitor performance, and shop around since US prices swing by USD 351.

The headline spec is that 5120 x 2160 resolution at 120Hz, which is a lot of pixels to push and this panel handles it without breaking a sweat. The 5ms GtG response time is fine for productivity and casual gaming, but it's not going to impress anyone used to a fast OLED. FreeSync Premium Pro is there if you want to game, and the 2000:1 static contrast ratio is solid for an IPS panel, though it won't touch OLED black levels.

Where this thing really shines is the connectivity suite. Thunderbolt 5 with 96W power delivery, two HDMI 2.1 ports, DisplayPort 2.1, four USB-C ports, daisy chain support, RJ45, and KVM. That's a 99th percentile connectivity score and it shows. You can run a MacBook Pro, a desktop, and a pile of peripherals through this monitor without a separate dock. The built-in speakers with "rich bass" are there, but nobody's buying a USD 1,649 monitor for the speakers.

Against the Dell UltraSharp U4025QW, the LG has a higher refresh rate at 120Hz versus the Dell's 60Hz, and Thunderbolt 5 is a step up from Thunderbolt 4. But the Dell has a stronger reputation for color accuracy out of the box and a more refined stand. The ASUS ROG Strix XG27UCDMG and MSI MAG 271QPX QD-OLED E2 are completely different animals, smaller 27-inch OLED panels built for speed and contrast. They'll crush the LG in gaming performance and black levels, but they can't touch the 5K2K resolution or the connectivity suite. The Samsung Odyssey G60SD and Gigabyte MO27U2 SA fall into the same camp. If you're editing video or managing a complex workstation setup, the LG makes sense. If you're gaming, any of those OLED competitors will feel dramatically better.

Pricing is all over the place. US listings range from USD 1,649 to USD 2,000 across 7 vendors, so shopping around is not optional. That USD 351 spread is real money, and there's no reason to pay the high end when the low end exists. Canadian buyers face an even wider gap, CAD 1,800 to CAD 2,475 across 3 listings. For what you get, the low end of the US range feels defensible if you need the Thunderbolt 5 connectivity and 5K2K resolution for work. At the high end, you're creeping into territory where other options start looking more attractive.

The LG UltraFine 40U990A sits in the 99th percentile for connectivity and display in our database, which is about as good as it gets for a productivity ultrawide. You're looking at a 39.7-inch 5K2K panel running 5120 x 2160 at 120Hz with Thunderbolt 5, and that combo alone puts it in rare company. The 99% DCI-P3 coverage and 450 nits peak brightness mean color work is genuinely viable here, not just a spec sheet flex.

But the customer rating of 3.9 out of 5 across 93 reviews tells a more complicated story. Some buyers are thrilled, especially MacBook Pro owners who appreciate the single-cable Thunderbolt 5 setup with 96W power delivery. Others feel let down, particularly folks coming from LG's own OLED gaming displays. At USD 1,649 to USD 2,000 depending on the vendor, this is a serious investment, and the 58th percentile performance score suggests it's not trying to be a gaming monitor despite the 120Hz refresh rate.

Gamers should look elsewhere. The 58th percentile performance score and 5ms response time won't satisfy anyone used to a fast OLED panel, and the 450 nits brightness won't make HDR content pop the way a dedicated gaming display will. If you're coming from an LG UltraGear OLED, you'll notice the downgrade immediately. Also skip this if you don't need the connectivity suite, because you're paying a premium for Thunderbolt 5, KVM, and the USB hub. A simpler 4K monitor at half the price will cover basic productivity just fine.

The LG UltraFine 40U990A is a connectivity monster with a gorgeous 5K2K panel, and for the right buyer it's worth every penny. That buyer is someone running a MacBook Pro or a workstation who wants one cable to rule them all and needs the screen real estate for editing, coding, or content creation. The 99th percentile display and connectivity scores back that up. But the 58th percentile performance and mixed 3.9-star reviews mean it's not a universal recommendation. If you're expecting OLED-level contrast or gaming-grade response, you'll be disappointed. If you're replacing a multi-monitor setup with a single ultrawide hub, this is one of the best options on the market right now.