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- GT1080HDR vs PX748-4K
Optoma GT1080HDR vs ViewSonic PX748-4K
What GT1080HDR does better (1) and where PX748-4K wins (3) — every spec side by side.
Dimensions
Size comparison
GT1080HDRPX748-4K
| GT1080HDR | PX748-4K | Difference | |
|---|---|---|---|
| Height | 112 mm | 108 mm | +4 mm |
| Width | 316 mm | 312 mm | +4 mm |
| Depth | 257 mm | 222 mm | +35 mm |
| Weight | 3 kg | 2.8 kg | +0.2 kg |
Drawn to the same scale from the official dimensions (front and side).
Why is GT1080HDR better than PX748-4K?
- Fan noise26 dB vs 32 dB+23%
Why is PX748-4K better than GT1080HDR?
- Brightness (ANSI / ISO lumens)3,800 lm vs 4,000 lm+5%
- HDMI inputs1 vs 22×
- Weight3 kg vs 2.8 kg+7%
Specifications
Side by side
| Picture | ||
| Resolution (on screen) | — | 3840 × 2160 (4K UHD) |
| Native panel resolution | — | 1920 × 1080 (Full HD) |
| 4K method | — | 4K by pixel shifting |
| Display technology | DLP | DLP |
| Light source | Lamp | — |
| Brightness (ANSI / ISO lumens) | 3,800 lm | 4,000 lm |
| Contrast ratio (dynamic / claimed) | — | 12,000:1 |
| HDR support | Yes | Yes |
| HDR formats | HDR10 | — |
| 3D playback | Yes | — |
| Gaming | ||
| Maximum refresh rate | — | 240 Hz |
| Game / low-latency mode | Yes | Yes |
| Lens & placement | ||
| Throw ratio | 0.5:1 | 1.13:1 |
| Throw ratio (zoomed in) | — | 1.47:1 |
| Throw type | Short throw (0.4–1.0:1) | Standard throw (1.0:1 and longer) |
| Distance for a 100″ 16:9 image | 1.11 m | 2.5 m |
| Smallest image size | — | 30″ |
| Largest image size | — | 300″ |
| Optical zoom | — | 2× |
| Lens shift | — | None |
| Keystone correction | Yes | Yes |
| Automatic keystone correction | No | No |
| Sound | ||
| Built-in speakers (total output) | — | 10 W |
| Connectivity | ||
| HDMI inputs | 1 | 2 |
| USB port | — | Yes |
| Ethernet (LAN) | — | No |
| VGA input | Yes | No |
| Audio output | — | Yes |
| Battery, power & lifetime | ||
| Power consumption | — | 310 W |
| Light source life | — | 4,000 h |
| Light source life (eco mode) | — | 20,000 h |
| Design & noise | ||
| Fan noise | 26 dB | 32 dB |
| Fan noise (eco mode) | — | 27 dB |
| Weight | 3 kg | 2.8 kg |
| Width | 316 mm | 312 mm |
| Height | 112 mm | 108 mm |
| Depth | 257 mm | 222 mm |
| Colours | — | White |
