BenQ RD280U vs Kuycon P40K
Side-by-side comparison of viewing distance, PPI, and specifications
Category Ranking
Pixel Density (PPI)67in category
BenQ RD280U164 PPI #18
Kuycon P40K139 PPI #41
93 PPI224 PPI
HDR Peak Brightness67in category
BenQ RD280U400 nits #51
Kuycon P40K450 nits #48
250 nits2000 nits
DCI-P3 Color Gamut63in category
BenQ RD280U93% #59
Kuycon P40K96% #45
79%100%
Refresh Rate
BenQ RD280U60 Hz
Kuycon P40K120 Hz
StandardHighUltra
Summary
- Sharpness: no visible difference — Both screens exceed the retina threshold at 65cm. The BenQ RD280U has 18% higher pixel density (164 vs 139 PPI), but this only becomes visible below 53cm.
- Brightness: comparable — Both screens offer similar brightness (350 vs 400 nits SDR). Neither has a meaningful advantage for outdoor use.
Key Differences
| Specification | BenQ RD280U | Kuycon P40K |
|---|---|---|
| Pixel Density (PPI) | 164 | 139 |
| Optimal Viewing Distance | 53cm | 63cm |
| Response Time | 5 ms GTG | 8 ms GTG |
| Screen Size | 28.2" | 40" |
| Resolution | 3840×2560 | 5120×2160 |
| Refresh Rate | 60 Hz | 120 Hz |
| SDR Brightness | 350 nits | 400 nits |
| HDR Peak Brightness | 400 nits | 450 nits |
| Contrast Ratio | 1:1,200 | 1:2,000 |
| USB-C Power Delivery | 90 W | 100 W |
| Color Gamut | sRGB 100% · DCI-P3 93% · Adobe RGB 87% | sRGB 99% · DCI-P3 96% |
| Year | 2024 | 2025 |
All specifications
| Specification | BenQ RD280U 2024 | Kuycon P40K 2025 |
|---|---|---|
| Screen Size | 28.2" | 40" (Better) |
| Resolution | 3840×2560 | 5120×2160 (Better) |
| Pixel Density (PPI) | 164 (Better) | 139 |
| Optimal Viewing Distance | 53cm (Better) | 63cm |
| Panel Type | IPS | IPS |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 3:2 | 21:9 |
| Refresh Rate | 60 Hz | 120 Hz (Better) |
| Variable Refresh Rate (VRR) | None | G-SYNC Compatible |
| Response Time | 5 ms GTG (Better) | 8 ms GTG |
| HDR Certification | DisplayHDR 400 | None |
| SDR Brightness | 350 nits | 400 nits (Better) |
| HDR Peak Brightness | 400 nits | 450 nits (Better) |
| Contrast Ratio | 1:1,200 | 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 | 90 W | 100 W (Better) |
| Color Gamut | sRGB 100% · DCI-P3 93% · Adobe RGB 87% | sRGB 99% · DCI-P3 96% (Better) |
| Year | 2024 | 2025 (Better) |
Frequently Asked Questions
Which has better PPI: BenQ RD280U or Kuycon P40K?
The BenQ RD280U has 164 PPI compared to 139 PPI for the Kuycon P40K.
Which has a closer optimal viewing distance?
The BenQ RD280U requires 53cm vs 63cm for the Kuycon P40K to reach retina quality.
Related Comparisons
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs BenQ RD280U 2024 · 164 PPI · 28.2" · 60 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 BenQ RD280U 2024 · 164 PPI · 28.2" · 60 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: