ASUS ROG Strix XG309CM vs Japannext JN-IPS275K-HSPC9 27"
Side-by-side comparison of viewing distance, PPI, and specifications
Japannext JN-IPS275K-HSPC9 27"
27" · 5120×2880 · IPS
Optimal Viewing Distance 40cm
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Category Ranking
Pixel Density (PPI)67in category
ASUS ROG Strix XG309CM94 PPI #65
Japannext JN-IPS275K-HSPC9 27"218 PPI #5
93 PPI224 PPI
HDR Peak Brightness67in category
ASUS ROG Strix XG309CM300 nits #65
Japannext JN-IPS275K-HSPC9 27"350 nits #61
250 nits2000 nits
DCI-P3 Color Gamut
Japannext JN-IPS275K-HSPC9 27"100% #1
79%100%
Refresh Rate
ASUS ROG Strix XG309CM220 Hz
Japannext JN-IPS275K-HSPC9 27"60 Hz
StandardHighUltra
Summary
- Sharpness: advantage Japannext JN-IPS275K-HSPC9 27" — At 65cm, the Japannext JN-IPS275K-HSPC9 27" is retina (218 PPI) while the ASUS ROG Strix XG309CM is not — you need to sit at least 93cm away for pixel-free viewing.
- Brightness: comparable — Both screens offer similar brightness (300 vs 350 nits SDR). Neither has a meaningful advantage for outdoor use.
Key Differences
| Specification | ASUS ROG Strix XG309CM | Japannext JN-IPS275K-HSPC9 27" |
|---|---|---|
| Screen Size | 29.5" | 27" |
| Refresh Rate | 220 Hz | 60 Hz |
| Response Time | 1 ms GTG | 8 ms GTG |
| Color Gamut | sRGB 110% | sRGB 100% · DCI-P3 100% |
| Resolution | 2560×1080 | 5120×2880 |
| Pixel Density (PPI) | 94 | 218 |
| Optimal Viewing Distance | 93cm | 40cm |
| SDR Brightness | 300 nits | 350 nits |
| HDR Peak Brightness | 300 nits | 350 nits |
| Contrast Ratio | 1:1,000 | 1:2,000 |
| USB-C Power Delivery | 15 W | 90 W |
| Year | 2022 | 2025 |
All specifications
| Specification | ASUS ROG Strix XG309CM 2022 | Japannext JN-IPS275K-HSPC9 27" 2025 |
|---|---|---|
| Screen Size | 29.5" (Better) | 27" |
| Resolution | 2560×1080 | 5120×2880 (Better) |
| Pixel Density (PPI) | 94 | 218 (Better) |
| Optimal Viewing Distance | 93cm | 40cm (Better) |
| Panel Type | IPS | IPS |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 21:9 | 16:9 |
| Refresh Rate | 220 Hz (Better) | 60 Hz |
| Variable Refresh Rate (VRR) | FreeSync Premium | G-SYNC Compatible |
| Response Time | 1 ms GTG (Better) | 8 ms GTG |
| HDR Certification | None | None |
| SDR Brightness | 300 nits | 350 nits (Better) |
| HDR Peak Brightness | 300 nits | 350 nits (Better) |
| Contrast Ratio | 1:1,000 | 1:2,000 (Better) |
| Ports | 1x HDMI · 1x DP · USB-C · USB Hub | 2x HDMI · 1x DP · USB-C · USB Hub |
| USB-C Power Delivery | 15 W | 90 W (Better) |
| Color Gamut | sRGB 110% (Better) | sRGB 100% · DCI-P3 100% |
| Year | 2022 | 2025 (Better) |
Frequently Asked Questions
Which has better PPI: ASUS ROG Strix XG309CM or Japannext JN-IPS275K-HSPC9 27"?
The Japannext JN-IPS275K-HSPC9 27" has 218 PPI compared to 94 PPI for the ASUS ROG Strix XG309CM.
Which has a closer optimal viewing distance?
The Japannext JN-IPS275K-HSPC9 27" requires 40cm 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 ASUS ROG Strix XG309CM 2022 · 94 PPI · 29.5" · 220 Hz
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs Japannext JN-IPS275K-HSPC9 27" 2025 · 218 PPI · 27" · 60 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs ASUS ROG Strix XG309CM 2022 · 94 PPI · 29.5" · 220 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs Japannext JN-IPS275K-HSPC9 27" 2025 · 218 PPI · 27" · 60 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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