BenQ X3100i vs Optoma GT3900UHD

BenQ X3100i is quieter. Optoma GT3900UHD is $300 cheaper and lighter.

	BenQ X3100i$1,799 · Amazon Buy	Optoma GT3900UHD$1,499 · Amazon Buy

Key differences
White light output
White light output	3,300 lm ANSI	4,000 lm ISO
Native resolution
Native resolution	1080p (1920 × 1080)	—
Throw ratio
Throw ratio	1.15–1.5:1	0.5:1
Lowest input lag
Lowest input lag	4.2 msDerived	4.3 msDerived
Light source
Light source	LED	Laser (phosphor)
Fan noise
Fan noise	Normal 32 dB(A) · Eco 28 dB(A)	Normal 35 dB(A) · Eco 28 dB(A)
MSRP
MSRP	$2,399	$1,899
Best price
Best price	$1,799	$1,499
Room fit80″100″120″150″
Distance to screen
Distance to screen	2.5–3.3 m	1.1 m
Picture
White light output
White light output	3,300 lm ANSI	4,000 lm ISO
Brightness uniformity
Brightness uniformity	—	75%
Imaging technology
Imaging technology	DLP	DLP
Chip / panel diagonal
Chip / panel diagonal	0.65 in	—
Native resolution
Native resolution	1080p (1920 × 1080)	—
Native aspect
Native aspect	16:9Derived	16:9Derived
Pixel shift
Pixel shift	XPR 4-way	—
Addressable resolution
Addressable resolution	4K UHD (3840 × 2160)	4K UHD (3840 × 2160)
Dynamic contrast
Dynamic contrast	600,000:1	2,000,000:1
Dynamic contrast method
Dynamic contrast method	Light-source dimming	—
Colour gamut
Colour gamut	Rec. 709 95% coverage · DCI-P3 100% coverage	—
Colour bit depth (per channel)
Colour bit depth (per channel)	10 bit	—
Gamma / EOTF presets
Gamma / EOTF presets	2.2, 2.4, 2.6	2.2, 2.4
Colour temperature presets
Colour temperature presets	Native	—
HDR formats
HDR formats	HDR10, HLG	HDR10, HLG
Tone mapping
Tone mapping	Adjustable	—
Colour management (CMS)
Colour management (CMS)	6-axis	6-axis
Greyscale control points
Greyscale control points	2	—
Picture certifications
Picture certifications	—	ISF
3D
3D	Yes	Yes
3D formats
3D formats	Frame packing, Side-by-side, Top-bottom, Frame sequential	Frame packing, Side-by-side, Top-bottom, Frame sequential
3D glasses sync
3D glasses sync	—	DLP-Link
Light source
Light source
Light source	LED	Laser (phosphor)
Emitter
Emitter	4-channel LED	Blue laser + phosphor
Light engine
Light engine	—	DuraCore
Light-source life
Light-source life	20,000 h normal · 30,000 h eco · 30,000 h dynamic	30,000 h eco
Light output control
Light output control	—	Steps
Constant brightness mode
Constant brightness mode	—	Yes
Warm-up time
Warm-up time	15 s	10 s
Cool-down time
Cool-down time	15 s	10 s
Optics
Throw ratio
Throw ratio	1.15–1.5:1	0.5:1
Image size
Image size	60–200 in	30–150 in
Projection offset
Projection offset	110%	114%
Zoom
Zoom	Optical	None
Zoom ratio
Zoom ratio	1.3×Derived	—
Focal length
Focal length	17.02–22.21 mm	7.51 mm
Aperture (f-number)
Aperture (f-number)	1.8–2.25	2.8
Focus
Focus	Manual	Manual
Autofocus
Autofocus	No	No
Vertical lens shift
Vertical lens shift	±10%	None
Horizontal lens shift
Horizontal lens shift	—	None
Motorised lens shift
Motorised lens shift	No	—
Vertical keystone
Vertical keystone	30°	15°
Horizontal keystone
Horizontal keystone	30°	15°
Auto keystone
Auto keystone	Yes	—
Grid warp
Grid warp	—	Yes
Motion & gaming
Frame interpolation (MEMC)
Frame interpolation (MEMC)	No	—
Max input refresh
Max input refresh	1080p: 240 Hz · 4K UHD: 60 Hz	1080p: 240 Hz · 4K UHD: 60 Hz
Input lag
Input lag	1080p: 60 Hz 16.7 ms · 120 Hz 8.3 ms · 240 Hz 4.2 ms · 4K UHD: 60 Hz 16.7 ms	1080p: 60 Hz 16.7 ms · 120 Hz 8.6 ms · 240 Hz 4.3 ms · 4K UHD: 60 Hz 16.7 ms
Inputs & control
HDMI inputs
HDMI inputs	HDMI 2.0 (HDCP 2.2) · HDMI 2.0 (eARC, HDCP 2.2)	HDMI 2.0 · HDMI 2.0 (eARC)
Max input resolution
Max input resolution	4K UHD	4K UHD
USB media playback
USB media playback	Yes	—
Control ports
Control ports	RS-232, 12 V trigger	RS-232, 12 V trigger
PJLink
PJLink	—	Class 1
Control-system drivers
Control-system drivers	—	Crestron
Horizontal scan
Horizontal scan	15–135 kHz	15–150 kHz
Vertical scan
Vertical scan	23–240 Hz	24–240 Hz
Smart platform
Wi-Fi
Wi-Fi	Wi-Fi 5	—
Bluetooth
Bluetooth	5.0	—
Ethernet
Ethernet	—	Yes
Smart platform
Smart platform	Android TV	—
OS version
OS version	11	—
Google-certified
Google-certified	Yes	—
Security updates until
Security updates until	31 Dec 2026	—
Netflix
Netflix	Via dongle	—
Casting
Casting	Chromecast built-in	—
Audio
Speaker power
Speaker power	10 W	15 W
Speakers
Speakers	2	1
Layout
Layout	Stereo	Mono
Tuned by
Tuned by	Bongiovi DPS	—
Audio formats
Audio formats	Dolby Atmos	—
Audio outputs
Audio outputs	3.5 mm, Optical, HDMI eARC, Bluetooth	3.5 mm, HDMI eARC
HDMI audio return
HDMI audio return	eARCDerived	eARCDerived
Physical & installation
Dimensions (W × D × H)
Dimensions (W × D × H)	272 × 259 × 213 mm	274 × 216 × 114 mm
Weight
Weight	6,800 g	2,900 g
Colours
Colours	—	Black
Orientations
Orientations	Table, Ceiling, Rear	Table, Ceiling, Rear, Portrait, 360°
Ceiling mount
Ceiling mount	M4, 20–25 mm screws	—
Exhaust
Exhaust	Side	—
Ingress protection
Ingress protection	—	IP6X
Environment & power
Operating temperature
Operating temperature	0–40°C	0–40°C
Operating humidity
Operating humidity	10–90%RH	10–85%RH
Altitude
Altitude	3,000 m · high-altitude mode	2,500 m · high-altitude mode
Power draw
Power draw	Max 360 W · Normal 330 W	Max 178 W · Normal 178 W · Eco 125 W
Standby
Standby	Up to 0.5 W	Up to 0.5 W
Power supply
Power supply	Built in	External adapter
Mains input
Mains input	100–240 V · 50/60 Hz	100–240 V · 50/60 Hz
Fan noise
Fan noise	Normal 32 dB(A) · Eco 28 dB(A)	Normal 35 dB(A) · Eco 28 dB(A)
Safety & support
Laser class
Laser class	—	Class 1
Risk group
Risk group	RG2	RG2
Hazard distance
Hazard distance	—	1 m
Marks
Marks	—	CE, FCC
Warranty
Warranty	3 yr	5 yr or 12,000 h
User manual
User manual	https://esupportdownload.benq.com/esupport/PROJECTOR/UserManual/X3100i/X3100i_UM_EN_230919170246.pdf	https://region-resource.optoma.com/products/documents/CWqYJUpb2tPRrTwMj1QGYRcPXH2q7xeKXHsKXAZ4.pdf
Firmware
Firmware	1.10	—
In the box
In the box
In the box	Power cord, Remote, Remote batteries, Quick start guide, Warranty card, Streaming dongle	Power cord, Power adapter, Remote, Remote batteries, Quick start guide, Warranty card
Remote
Remote	IR	IR

BenQ X3100i$1,799 · Amazon

Buy

Optoma GT3900UHD$1,499 · Amazon

Buy