LG 39GX950B
Today
Typical price$2,200
Amazon: the cheapest today among the stores checked
9.0 out of 10 on the spec sheet +3.8
Buy on AmazonLG 39GX950B or LG 40U990A-W?
Cost the same today; 39GX950B has score 3.8 higher (9.0 vs. 5.2).
LG 39GX950B
9.0score · higher
LG 40U990A-W
5.2score
LG 39GX950B wins 3by componentLG 40U990A-W wins 0
- 8.3Image4.2
- 10.0Smoothness8.0
- 9.0Connections3.0
LG 39GX950B is the cheaperLG 40U990A-W is the cheaper
The best for each use
By the spec rule for each use, the same one the lists on this site use.
Monitors for competitive gaming
Only LG 39GX950B works: 144 Hz or more and a stated 1 ms.
Monitors for creative work (photo and video)
Only LG 39GX950B works: QHD or 4K with an IPS or OLED panel.
Neither one fits: Monitors for work and study, Monitors for casual gaming and console, Monitors to use two on the desk, Cheap monitors worth buying.
The comparison in detail
LG UltraFine or UltraGear: all sizes
Score by component, side by side
39GX950B wins on image, smoothness and connections.
- 8.3 (wins)Image4.2
- 10.0 (wins)Smoothness8.0
- 9.0 (wins)Connections3.0
LG 40U990A-W
Today
Typical price$2,200
Amazon: the cheapest today among the stores checked
5.2 out of 10 on the spec sheet
Buy on AmazonAffiliate links: if you buy, the store pays us a commission at no cost to you.
Both prices over the last 30 days
First data point for one of the two: the chart appears as the days go by.
Still only a few days of data for both to read the trend; the chart fills in as the days go by.
Where is each one cheapest today?
Updated 12/11/2026
39GX950B
- Amazon Lowest price$2,200Buy on Amazon
40U990A-W
- Amazon Lowest price$2,200Buy on Amazon
The math the store doesn’t do
Price divided by size and running cost, side by side.
Spec sheet side by side
| Item | 39GX950B | 40U990A-W |
|---|---|---|
| Screen | ||
| Type changes | Gaming (144 Hz or more) | General use and office |
| Size changes | 39 ″ | 40 ″ |
| Resolution changes | WUHD | 4K |
| Pixel density changes | 142 ppi | 110 ppi |
| Panel changes | OLED | not listed |
| Aspect ratio | 21:9 | 21:9 |
| Curved screen | Yes | Yes |
| Stated HDR changes | HDR10 | HDR 600 |
| Line changes | UltraGear | UltraFine |
| Smoothness | ||
| Refresh rate changes | 330 Hz | 120 Hz |
| Response time (stated) changes | 0.0 ms | 5 ms |
| Response time measurement changes | GtG | not listed |
| Sync changes | G-SYNC | FreeSync |
| Connections | ||
| HDMI ports changes | 2 | 1 |
| DisplayPort ports changes | 2 | not listed |
| USB-C changes | Yes | not listed |
| USB-C with laptop charging changes | Yes | not listed |
| Built-in speaker changes | not listed | Yes |
| General | ||
| Model code changes | 39GX950B | 40U990A-W |
Other comparisons
39GX950B orLG 49U950A$1,900 · score 3.2Compare
40U990A-W orTCL LD2304$3,500 · score 4.3Compare
39GX950B orSamsung LS34DG850S$1,398 · score 3.5Compare
39GX950B orSamsung LS40H852TA$1,498 · score 3.7Compare
39GX950B orSamsung LS49FG910E$1,500 · score 5.1Compare- 39GX950B orTCL LD2304$3,500 · score 4.3Compare
How we choose
Source: Amazon.ca catalog, checked on 12/11/2026.
Lowest price seen for the product on Amazon.ca, delivered to Toronto M5V 3L9, on the day it was read, before GST/HST. The model is the brand plus the name of the monitor; the versions go in the table. The price range, the median and the position use only models with a score; the price comparison looks at models whose score is within 0.5 points.
The spec score doesn’t measure the real calibration or durability, and the strong or weak point reading is just a comparison of numbers, not a buying recommendation.