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 is the better projector overall, rated 4.7 to 3.8. The BenQ X3100i leads on streaming, setup and warranty. The Optoma UHD35STx wins on value. The Optoma UHD35STx costs $500 less ($1,299 vs $1,799).
Optoma UHD35STx
#21 in 4KFull review
A short throw 4K gaming projector for small rooms where the projector has to sit close to the screen.
Amazon $1,299$1,299
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.
Which should you buy?
- Choose the BenQ X3100i for streaming (Android TV with licensed Netflix vs no built-in apps; needs a streaming stick), setup (Auto keystone, 1.3x zoom, lens shift vs Manual focus and keystone) and warranty (3-year warranty vs 1-year warranty).
- Choose the Optoma UHD35STx for value ($0.36 per lumen vs $0.55 per lumen).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 4K projector; a clear win is highlighted. How we rank explains each one.
| Factor weight | BenQ X3100i | Optoma UHD35STx |
|---|---|---|
| Overall rating | 4.7/5 | 3.8/5 |
| Brightness 25% | 91 3,300 ANSI lumens | 95 3,600 ANSI lumens |
| Value 15% | 86 $0.55 per lumen | 96 $0.36 per lumen |
| Resolution 10% | 100 4K (pixel shift) | 100 4K (pixel shift) |
| Streaming 15% | 100 Android TV with licensed Netflix | 0 no built-in apps; needs a streaming stick |
| Setup 10% | 70 Auto keystone, 1.3x zoom, lens shift | 0 Manual focus and keystone |
| Light life 10% | 100 30,000 hour LED | 69 15,000 hour lamp |
| Gaming 10% | 100 4.2 ms input lag | 100 4 ms input lag |
| Warranty 5% | 100 3-year warranty | 0 1-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. |
Optoma UHD35STx
No independent test published yet.
Specifications
| BenQ X3100i | Optoma UHD35STx | |
|---|---|---|
| Picture | ||
| Brightness | 3,300 ANSI | 3,600 ANSI |
| Native resolution | 1920 x 1080 (1080p) | 1920 x 1080 (1080p) |
| Picture resolution | 4K (pixel shift from 1920x1080) | 4K (pixel shift from 1920x1080) |
| Display | DLP | DLP |
| Light source | LED | lamp |
| Light source life | 30,000 hours | 15,000 hours |
| HDR | HDR10 | HDR10, HLG |
| Color gamut | 100% DCI-P3 | - |
| Dynamic contrast | 600,000:1 | 1,000,000:1 |
| Placement | ||
| Throw | Standard throw (1.1:1) | Short throw (0.5:1) |
| Largest image | 300 in | 300 in |
| Autofocus | No | No |
| Auto keystone | Yes | No |
| Obstacle avoidance | No | No |
| Auto screen fit | No | No |
| Optical zoom | 1.3x | None |
| Lens shift | Vertical | - |
| Streaming and gaming | ||
| Built-in apps | Android TV, licensed Netflix | None |
| Input lag | 4.2 ms | 4 ms |
| Top refresh rate | 240 Hz | 240 Hz |
| HDMI ports | 2 | 2 |
| eARC | Yes | - |
| Speakers | 10 W | 10 W |
| Build | ||
| Battery | None | None |
| Fan noise | 32 dB | 28 dB |
| Power | 330 W | 320 W |
| Dimensions | 10.7 x 8.4 x 10.2 in (W x D x H) | 12.4 x 10.63 x 4.65 in (W x D x H) |
| Weight | 15 lb | 7.7 lb |
| Warranty | 3 years | 1 years |
| Released | 2023-10 | 2022-09 |