Research · 39" 5K2K Tandem WOLED
LG UltraGear 39GX950B: what the testing says
The 39GX950B is the ultrawide to buy on Amazon if you want sharpness and HDR punch: 5120x2160 on a gentle 1500R curve, bright Tandem WOLED highlights, and a matte coating that copes with a sunny room. TechSpot and TFTCentral both rate it highly. The problem is Dell's Alienware AW3926QW, which shares the panel family, costs $1,099.99 at Dell.com, and has a three-year burn-in warranty against LG's two years.
Our take
The short version
LG's 39GX950B was the first 39-inch ultrawide OLED with a 5K2K (5120x2160) resolution, and it fixes most of what made earlier 39-inch OLEDs a compromise: low pixel density and a steep 800R curve. At 143 pixels per inch it's about as sharp as a 27-inch 1440p monitor, just much wider, and the 1500R curve is gentle enough for spreadsheets as well as games. TechSpot named it the best 39-inch ultrawide (May 2026) and the best ultrawide in its OLED guide (June 2026); TFTCentral gave it a Recommended award.
HDR is its standout. LG rates it for 1,500 nits on small highlights and 600 nits at a 10% window, and TechSpot calls it the brightest HDR it had seen on an ultrawide OLED. The matte coating handles glare and keeps blacks deep in a bright room, and LG adds features the competition skips: two 7W speakers and hardware calibration. A dual mode drops to 2560x1080 at 330Hz for faster games, since 165Hz at full resolution is modest by OLED standards.
The catch is value. TechSpot's September review of Dell's Alienware AW3926QW, which uses an RGB-stripe version of the same panel family, says the Dell is "better overall" and makes the LG look overpriced at its $1,799.99 list. The Dell has sharper text, a KVM switch, and a three-year warranty that covers burn-in, while LG's sheet lists two years parts and labor. The Alienware is sold through Dell.com rather than Amazon US, so the LG remains the 5K2K ultrawide you can buy on Amazon; at $1,399.99 on October 7 it's far easier to justify than at list.
Pros and cons
What we like
- 5K2K on 39 inches: about 27-inch-1440p sharpness, much wider
- Brightest HDR TechSpot has seen on an ultrawide OLED
- Matte coating suits bright rooms
- Gentle 1500R curve, plus a 2560x1080 330Hz dual mode
- Built-in 2x 7W speakers and hardware calibration
Trade-offs
- Dell's Alienware AW3926QW is $300 cheaper at Dell.com with a better warranty
- Two-year warranty; burn-in coverage isn't stated on LG.com
- 165Hz native refresh rate
- No KVM switch and no USB-B upstream port
- RTINGS notes visible VRR flicker
Who it's for
Buy it if…
- Gamers who want the most immersive, sharpest ultrawide for single-player games
- Bright rooms where a glossy OLED would mirror windows
- Anyone who wants built-in speakers on a premium ultrawide
Skip it if…
- Value hunters: the Alienware AW3926QW (Dell.com, $1,099.99) is the better deal if you'll buy outside Amazon
- Esports players who want 240Hz+ at native resolution: see the MSI MPG 341CQR X36
- Anyone with a mid-range GPU: 5K2K is very demanding in games
Spec sheet
39GX950B specs
| Screen size | 39" (21:9) |
|---|---|
| Resolution | 5120 x 2160 (5K2K) |
| Refresh rate | 165Hz; dual mode 330Hz at 2560 x 1080 |
| Panel | Tandem WOLED (RGWB) |
| Response time | 0.03ms GtG |
| Brightness | 335 nits typical; 1,500 nits peak (HDR, 1.5% window), 600 nits at 10% |
| Contrast | 1,850,000:1 |
| HDR certification | VESA DisplayHDR True Black 500 |
| Color gamut | 99.5% DCI-P3; factory calibrated, hardware calibration ready |
| Adaptive sync | G-Sync Compatible; AMD FreeSync Premium Pro |
| Ports | 2x HDMI 2.1, 1x DisplayPort 2.1 (UHBR20), USB-C, 2x USB-A, headphone/mic jack |
| USB-C / Thunderbolt | DisplayPort Alt Mode; 90W power delivery |
| KVM switch | No |
| Stand | Height, tilt, swivel (no pivot) |
| VESA mount | 100 x 100 mm |
| Curvature | 1500R |
| Screen finish | Matte anti-glare |
| Weight | 23.6 lb with stand |
| Warranty | 2 years parts and labor |
| Also notable | 2x 7W speakers; PbP/PiP; rear RGB lighting; external power adapter |
From the manufacturer sources listed below. “Not specified” means those sources don't state it.
Watch
39GX950B on video
Video by TFTCentral on YouTube. Their views are their own.
Cross-shop
Alternatives to consider
Alienware AW3426DW
- 34" 3440x1440
- QD-OLED
- 280Hz
- ~$799.99
The newest RGB-stripe QD-OLED ultrawide panel at 280Hz, for hundreds less than the 360Hz flagships.
Pros
- Pro: TechSpot 90 and its go-to 34-inch ultrawide; RTINGS best mid-range ultrawide
- Pro: 5th-gen RGB-stripe QD-OLED: clean text, no color fringing
- Pro: Dolby Vision plus DisplayHDR True Black 500
Trade-offs
- Trade-off: USB-C is data only: no single-cable laptop setup, and no KVM switch
- Trade-off: 280Hz versus 360Hz on the pricier flagships
- Gaming
- 5 out of 5
- Color
- 5 out of 5
- HDR
- 4 out of 5
Editorial fit scores, 1–5, from published reviews and specs — not lab measurements.
Check priceAffiliate link to Amazon. Price approx., seen Oct 2026.
Read the breakdown: Alienware AW3426DWMSI MPG 341CQR QD-OLED X36
- 34" 3440x1440
- QD-OLED
- 360Hz
- ~$899.99
The fastest ultrawide OLED, with an RGB-stripe panel that finally fixes QD-OLED text fringing.
Pros
- Pro: 360Hz with near-instant response and no VRR flicker (RTINGS)
- Pro: RGB-stripe QD-OLED fixes the text fringing of older panels
- Pro: 98W USB-C, KVM switch, and PiP/PbP
Trade-offs
- Trade-off: Blacks still look gray in a bright room, even with DarkArmor (RTINGS, TFTCentral)
- Trade-off: 3440x1440 is noticeably less sharp than 5K2K
- Gaming
- 5 out of 5
- Color
- 5 out of 5
- Work
- 4 out of 5
Editorial fit scores, 1–5, from published reviews and specs — not lab measurements.
Check priceAffiliate link to Amazon. Price approx., seen Oct 2026.
Read the breakdown: MSI MPG 341CQR QD-OLED X36ASUS ROG Strix OLED XG32UCWMG
- 32" 4K
- WOLED
- 240Hz
- ~$977.19
TechSpot's best overall gaming monitor: a glossy 32-inch 4K OLED that switches to 1080p at 480Hz.
Pros
- Pro: TechSpot's best overall gaming monitor (Sep 2026) and best 32-inch 4K HDR (Jul 2026)
- Pro: Glossy TrueBlack coating keeps blacks deep in a lit room
- Pro: Dual mode: 4K at 240Hz or 1080p at 480Hz
Trade-offs
- Trade-off: Glossy screen mirrors lamps and windows; not bright enough for intense glare (RTINGS)
- Trade-off: Noticeable VRR flicker when frame rates swing (RTINGS)
- Gaming
- 5 out of 5
- Work
- 4 out of 5
- HDR
- 4 out of 5
Editorial fit scores, 1–5, from published reviews and specs — not lab measurements.
Check priceAffiliate link to Amazon. Price approx., seen Oct 2026.
Read the breakdown: ASUS ROG Strix OLED XG32UCWMG
Related guides and comparisons
Sources
Manufacturer specs
- LG 39GX950B-B product page (opens in a new tab) — Specs, list price, and warranty
Published testing and reviews
- TechSpot (opens in a new tab) — Best Ultrawide Gaming Monitors 2026 (May 8, 2026): best 39-inch; AW3926QW review (Sep 9, 2026) comparison
- TFTCentral (opens in a new tab) — Review (Apr 24, 2026): Recommended
- RTINGS — Review; notable mention in Best Ultrawide Monitors
- PC Gamer — Review (Jul 17, 2026): 89/100
Published reviews and manufacturer specs, researched October 7, 2026. We didn't test these monitors ourselves; judgments credited to an outlet are that outlet's.
Disclosure: Our picks are independent and editorial — a synthesis of published reviews and manufacturer specs, not our own lab measurements. Prices are approximate Amazon prices seen October 7, 2026, not live quotes. As an Amazon Associate we earn from qualifying purchases made through links on this page, at no extra cost to you.