ASUS ROG Strix XG309CM vs Kuycon P40K
Side-by-side comparison of viewing distance, PPI, and specifications
Category Ranking
Pixel Density (PPI)67in category
ASUS ROG Strix XG309CM94 PPI #65
Kuycon P40K139 PPI #41
93 PPI224 PPI
HDR Peak Brightness67in category
ASUS ROG Strix XG309CM300 nits #65
Kuycon P40K450 nits #48
250 nits2000 nits
DCI-P3 Color Gamut
Kuycon P40K96% #45
79%100%
Refresh Rate
ASUS ROG Strix XG309CM220 Hz
Kuycon P40K120 Hz
StandardHighUltra
Summary
- Sharpness: advantage Kuycon P40K — At 65cm, the Kuycon P40K is retina (139 PPI) while the ASUS ROG Strix XG309CM is not — you need to sit at least 93cm away for pixel-free viewing.
- Brightness: advantage Kuycon P40K — The Kuycon P40K is 33% brighter in SDR (400 vs 300 nits), a noticeable difference for outdoor readability. HDR peak: 450 vs 300 nits.
Key Differences
| Specification | ASUS ROG Strix XG309CM | Kuycon P40K |
|---|---|---|
| Refresh Rate | 220 Hz | 120 Hz |
| Response Time | 1 ms GTG | 8 ms GTG |
| Color Gamut | sRGB 110% | sRGB 99% · DCI-P3 96% |
| Screen Size | 29.5" | 40" |
| Resolution | 2560×1080 | 5120×2160 |
| Pixel Density (PPI) | 94 | 139 |
| Optimal Viewing Distance | 93cm | 63cm |
| SDR Brightness | 300 nits | 400 nits |
| HDR Peak Brightness | 300 nits | 450 nits |
| Contrast Ratio | 1:1,000 | 1:2,000 |
| USB-C Power Delivery | 15 W | 100 W |
| Year | 2022 | 2025 |
All specifications
| Specification | ASUS ROG Strix XG309CM 2022 | Kuycon P40K 2025 |
|---|---|---|
| Screen Size | 29.5" | 40" (Better) |
| Resolution | 2560×1080 | 5120×2160 (Better) |
| Pixel Density (PPI) | 94 | 139 (Better) |
| Optimal Viewing Distance | 93cm | 63cm (Better) |
| Panel Type | IPS | IPS |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 21:9 | 21:9 |
| Refresh Rate | 220 Hz (Better) | 120 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 | 400 nits (Better) |
| HDR Peak Brightness | 300 nits | 450 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 | 100 W (Better) |
| Color Gamut | sRGB 110% (Better) | sRGB 99% · DCI-P3 96% |
| Year | 2022 | 2025 (Better) |
Frequently Asked Questions
Which has better PPI: ASUS ROG Strix XG309CM or Kuycon P40K?
The Kuycon P40K has 139 PPI compared to 94 PPI for the ASUS ROG Strix XG309CM.
Which has a closer optimal viewing distance?
The Kuycon P40K requires 63cm 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 Kuycon P40K 2025 · 139 PPI · 40" · 120 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 Kuycon P40K 2025 · 139 PPI · 40" · 120 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).
Last updated: