BenQ X3100i
#1 in 4KFull review
A bright LED 4K gaming projector with streaming in the box, for gamers who want low lag and no lamp to replace.
Amazon $1,799$1,799
The BenQ X3100i rates 4.7 among 4K projectors; the BenQ TH575i rates 4.6 among 1080p and under ones. The BenQ TH575i costs $1,150 less ($649 vs $1,799).
BenQ TH575i
A bright, gaming friendly 1080p projector for living rooms, with Google TV in the box. A good pick if you can live with replacing a lamp.
Amazon $649$649
Prices were last checked October 29, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different type classes (4K and 1080p and under), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | BenQ X3100i | BenQ TH575i |
|---|---|---|
| Overall rating | 4.7/5 | 4.6/5 |
| Brightness 25% | 91 3,300 ANSI lumens | 100 3,800 ANSI lumens |
| Value 15% | 86 $0.55 per lumen | 98 $0.17 per lumen |
| Resolution 10% | 100 4K (pixel shift) | 100 1920 x 1080 native |
| Streaming 15% | 100 Android TV with licensed Netflix | 100 Google TV with licensed Netflix |
| Setup 10% | 70 Auto keystone, 1.3x zoom, lens shift | 50 Auto keystone, 1.1x zoom |
| Light life 10% | 100 30,000 hour LED | 69 15,000 hour lamp |
| Gaming 10% | 100 4.2 ms input lag | 79 16.7 ms input lag |
| Warranty 5% | 100 3-year warranty | 100 3-year warranty |
Independent measurements
BenQ X3100i
| Tested by | Brightness | Input lag | Contrast | Conditions |
|---|---|---|---|---|
| ProjectorCentral | 2,949 lm | 5 ms | - | 2,949 ANSI lumens in Bright mode with video-level white (3,361 with full-white signal); 1,199 in calibrated User mode, Eco. Lag 5 ms at 1080p/240, 9 ms at 1080p/120, 17 ms at 4K/60 in FPS mode. |
BenQ TH575i
No independent test published yet.
Specifications
| BenQ X3100i | BenQ TH575i | |
|---|---|---|
| Picture | ||
| Brightness | 3,300 ANSI | 3,800 ANSI |
| Native resolution | 1920 x 1080 (1080p) | 1920 x 1080 (1080p) |
| Picture resolution | 4K (pixel shift from 1920x1080) | 1080p |
| Display | DLP | DLP |
| Light source | LED | lamp |
| Light source life | 30,000 hours | 15,000 hours |
| HDR | HDR10 | - |
| Color gamut | 100% DCI-P3 | 88% Rec.709 |
| Native contrast | - | 15,000:1 |
| Dynamic contrast | 600,000:1 | - |
| Placement | ||
| Throw | Standard throw (1.1:1) | Standard throw (1.5:1) |
| Largest image | 300 in | 300 in |
| Autofocus | No | No |
| Auto keystone | Yes | Yes |
| Obstacle avoidance | No | No |
| Auto screen fit | No | No |
| Optical zoom | 1.3x | 1.1x |
| Lens shift | Vertical | - |
| Streaming and gaming | ||
| Built-in apps | Android TV, licensed Netflix | Google TV, licensed Netflix |
| Input lag | 4.2 ms | 16.7 ms |
| Top refresh rate | 240 Hz | 120 Hz |
| HDMI ports | 2 | 1 |
| eARC | Yes | No |
| Speakers | 10 W | 10 W |
| Build | ||
| Battery | None | None |
| Fan noise | 32 dB | 34 dB |
| Power | 330 W | 295 W |
| Dimensions | 10.7 x 8.4 x 10.2 in (W x D x H) | 11.7 x 9.3 x 4.7 in |
| Weight | 15 lb | 5.1 lb |
| Warranty | 3 years | 3 years |
| Released | 2023-10 | 2026-07 |