AOC U27G4R 27" vs ASUS ROG Strix XG309CM
Side-by-side comparison of viewing distance, PPI, and specifications
Category Ranking
Pixel Density (PPI)67in category
AOC U27G4R 27"163 PPI #20
ASUS ROG Strix XG309CM94 PPI #65
93 PPI224 PPI
HDR Peak Brightness67in category
AOC U27G4R 27"400 nits #51
ASUS ROG Strix XG309CM300 nits #65
250 nits2000 nits
DCI-P3 Color Gamut63in category
AOC U27G4R 27"95.9% #47
79%100%
Refresh Rate
AOC U27G4R 27"160 Hz
ASUS ROG Strix XG309CM220 Hz
StandardHighUltra
Summary
- Sharpness: advantage AOC U27G4R 27" — At 65cm, the AOC U27G4R 27" is retina (163 PPI) while the ASUS ROG Strix XG309CM is not — you need to sit at least 93cm away for pixel-free viewing.
- Brightness: advantage AOC U27G4R 27" — The AOC U27G4R 27" is 33% brighter in SDR (400 vs 300 nits), a noticeable difference for outdoor readability. HDR peak: 400 vs 300 nits.
Key Differences
| Specification | AOC U27G4R 27" | ASUS ROG Strix XG309CM |
|---|---|---|
| Resolution | 3840×2160 | 2560×1080 |
| Pixel Density (PPI) | 163 | 94 |
| Optimal Viewing Distance | 54cm | 93cm |
| SDR Brightness | 400 nits | 300 nits |
| HDR Peak Brightness | 400 nits | 300 nits |
| Year | 2024 | 2022 |
| Screen Size | 27" | 29.5" |
| Refresh Rate | 160 Hz | 220 Hz |
| Color Gamut | sRGB 124.7% · DCI-P3 95.9% · Adobe RGB 93.4% | sRGB 110% |
All specifications
| Specification | AOC U27G4R 27" 2024 | ASUS ROG Strix XG309CM 2022 |
|---|---|---|
| Screen Size | 27" | 29.5" (Better) |
| Resolution | 3840×2160 (Better) | 2560×1080 |
| Pixel Density (PPI) | 163 (Better) | 94 |
| Optimal Viewing Distance | 54cm (Better) | 93cm |
| Panel Type | IPS | IPS |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 16:9 | 21:9 |
| Refresh Rate | 160 Hz | 220 Hz (Better) |
| Variable Refresh Rate (VRR) | G-SYNC Compatible | FreeSync Premium |
| Response Time | 0.5 ms MPRT | 1 ms GTG |
| HDR Certification | DisplayHDR 400 | None |
| SDR Brightness | 400 nits (Better) | 300 nits |
| HDR Peak Brightness | 400 nits (Better) | 300 nits |
| Contrast Ratio | 1:1,000 | 1:1,000 |
| Ports | 2x HDMI · 1x DP · USB Hub | 1x HDMI · 1x DP · USB-C · USB Hub |
| USB-C Power Delivery | — | 15 W |
| Color Gamut | sRGB 124.7% · DCI-P3 95.9% · Adobe RGB 93.4% | sRGB 110% (Better) |
| Year | 2024 (Better) | 2022 |
Frequently Asked Questions
Which has better PPI: AOC U27G4R 27" or ASUS ROG Strix XG309CM?
The AOC U27G4R 27" has 163 PPI compared to 94 PPI for the ASUS ROG Strix XG309CM.
Which has a closer optimal viewing distance?
The AOC U27G4R 27" requires 54cm vs 93cm for the ASUS ROG Strix XG309CM to reach retina quality.
Related Comparisons
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs AOC U27G4R 27" 2024 · 163 PPI · 27" · 160 Hz
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs ASUS ROG Strix XG309CM 2022 · 94 PPI · 29.5" · 220 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs AOC U27G4R 27" 2024 · 163 PPI · 27" · 160 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs ASUS ROG Strix XG309CM 2022 · 94 PPI · 29.5" · 220 Hz
Methodology & Sources
Formula: Retina distance (cm) = 3438 / PPI. Displayed values are rounded for readability.
Sources: Official manufacturer spec sheets and product pages. Specs are normalized before comparisons.
Comparison winners are calculated metric by metric (higher is better for most specs; lower is better for distance/response time).
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