AOC U27B3A
Today
Previous check$190
Amazon: the cheapest today among the stores checked
5.7 out of 10 on the spec sheet +0.8
Buy on AmazonAOC U27B3A or LG 27G640A?
AOC U27B3A costs $110 less today and also has score 0.8 higher (5.7 vs. 4.9).
AOC U27B3A
5.7score · higher
LG 27G640A
4.9score
AOC wins 2by componentLG wins 2
- 9.0Image2.6
- 1.5Smoothness9.5
- 7.0Connections2.0
- 3.0Ergonomics6.0
AOC U27B3A is $110 the cheaperLG 27G640A 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 work and study
Only AOC U27B3A works: General use, 23″ to 27″.
Monitors for competitive gaming
Only LG 27G640A works: 144 Hz or more and a stated 1 ms.
Monitors for casual gaming and console
Only LG 27G640A works: 120 Hz or more, 25″ to 32″.
Monitors for creative work (photo and video)
Only AOC U27B3A works: QHD or 4K with an IPS or OLED panel.
Monitors for creative work (photo and video)Up to $300On sale
Neither one fits: Monitors to use two on the desk, Cheap monitors worth buying.
The comparison in detail
Score by component, side by side
AOC U27B3A wins on image and connections; LG 27G640A wins on smoothness and ergonomics.
- 9.0 (wins)Image2.6
- 1.5Smoothness9.5 (wins)
- 7.0 (wins)Connections2.0
- 3.0Ergonomics6.0 (wins)
LG 27G640A
Today
Previous check$300
Amazon: the cheapest today among the stores checked
4.9 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.
Where is each one cheapest today?
Updated 12/11/2026
AOC U27B3A
- Amazon Lowest price$190Buy on Amazon
LG 27G640A
- Amazon Lowest price$300Buy on Amazon
The math the store doesn’t do
Price divided by size and running cost, side by side.
| Math | AOC U27B3A | LG 27G640A |
|---|---|---|
| Price per inch | $7.04 menor | $11.11 |
Spec sheet side by side
| Item | AOC U27B3A | LG 27G640A |
|---|---|---|
| Screen | ||
| Type changes | General use and office | Gaming (144 Hz or more) |
| Size | 27 ″ | 27 ″ |
| Resolution changes | 4K | QHD |
| Pixel density changes | 163 ppi | 109 ppi |
| Panel changes | IPS | not listed |
| Aspect ratio | 16:9 | 16:9 |
| Curved screen changes | No | not listed |
| Stated HDR changes | HDR | not listed |
| Line changes | not listed | UltraGear |
| Smoothness | ||
| Refresh rate changes | 60 Hz | 300 Hz |
| Response time (stated) changes | 4 ms | 1 ms |
| Response time measurement changes | MPRT | not listed |
| Sync changes | Adaptive-Sync | G-Sync |
| Connections | ||
| HDMI ports changes | 2 | 1 |
| DisplayPort ports changes | 1 | not listed |
| Built-in speaker changes | Yes | not listed |
| Ergonomics | ||
| Pivot (portrait mode) changes | not listed | Yes |
| VESA mount holes | Yes | Yes |
| General | ||
| Model code changes | U27B3A | 27G640A |
Other comparisons
AOC U27B3A orAOC Q27G3XMN$300 · score 5.0Compare
LG 27G640A orAsus VG27BQ$289 · score 4.7Compare
AOC U27B3A orAsus VA27EHF2$124 · score 4.7Compare
LG 27G640A orBenQ EX271U$370 · score 6.1Compare
AOC U27B3A orDell P2725D$279 · score 5.5Compare
LG 27G640A orMSI 245C$110 · score 5.3Compare
See more 8 comparisons
- AOC U27B3A or Dell SE2726H$120 · score 3.9
- LG 27G640A or MSI 342CQRF$290 · score 5.2
- AOC U27B3A or Dell SE2726HG$120 · score 3.7
- LG 27G640A or MSI 346CQDF$288 · score 5.2
- AOC U27B3A or LG 27U411A$120 · score 3.9
- AOC U27B3A or MSI MP272LE$120 · score 4.7
- AOC U27B3A or MSI MP273L$123 · score 2.8
- AOC U27B3A or MSI MP275PG$120 · score 3.6
How we choose
Source: Amazon.com catalog, checked on 12/11/2026.
Lowest price seen for the product on Amazon.com, shipped to New York 10001, on the day it was read, before sales tax. 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.