Main trade-off
BenQ X500i
Its short optical range and absent lens shift make some existing mounts unusable.
Head-to-head
BenQ X500i vs BenQ X3100i: X500i fits 120 inches from about 6–7 ft
The short answer
Choose X500i when you need a 120-inch picture from roughly six to seven feet away. Choose X3100i when you can place it farther back and need more output or vertical lens shift. Their published latency figures match at the main gaming formats, so room fit is the stronger divider.
Before you choose
The reasoning and the trade-offs
A seven-foot shelf can rule out the larger projector
For a 120-inch 16:9 image, X500i needs about 6.0 to 7.2 feet from lens to screen. X3100i needs about 10.0 to 13.1 feet. At seven feet, X500i fits optically and X3100i does not. Digital correction cannot supply the missing optical width.
What this is based on
BenQ X500i: Throw 0.69 to 0.83. Screen width 120 × 16 / √337 = 104.59 inches. BenQ X3100i: Throw 1.15 to 1.50. Distance = image width × throw ratio.
Main trade-off
BenQ X3100i
The longer throw needs considerably more room without a lower listed lag benefit.
BenQ X500i
- Choose it for
- The lens must sit about six to seven feet from a 120-inch screen
- Short throw keeps the projector ahead of the main seating
- Main trade-off
- Its short optical range and absent lens shift make some existing mounts unusable.
BenQ X3100i
- Choose it for
- The lens can sit ten to thirteen feet from a 120-inch screen
- Vertical lens shift is useful for the mount position
- Main trade-off
- The longer throw needs considerably more room without a lower listed lag benefit.
About this comparison
BenQ X500i vs X3100i for gaming and movies. Calculate the room depth each needs and find out why the larger model is not always the useful upgrade.
Winner by situation
Start with what you need it to do
120-inch image with a seven-foot lens distance
Only X500i’s optical range includes the placement.
- BenQ X500i
- Better fit
- BenQ X3100i
- Not suitable
120-inch image from eleven feet away
Only X3100i’s optical range includes that distance.
- BenQ X500i
- Not suitable
- BenQ X3100i
- Better fit
Buying the higher tier mainly for lower listed gaming lag
The quoted latency values match.
- BenQ X500i
- Good
- BenQ X3100i
- Good
A high mount that needs optical vertical adjustment
X3100i provides vertical lens shift, within its installation limits.
- BenQ X500i
- Caution
- BenQ X3100i
- Better fit
What matters in practice
The differences that matter
A seven-foot shelf can rule out the larger projector
For a 120-inch 16:9 image, X500i needs about 6.0 to 7.2 feet from lens to screen. X3100i needs about 10.0 to 13.1 feet. At seven feet, X500i fits optically and X3100i does not. Digital correction cannot supply the missing optical width.
How we reached this conclusion
BenQ X500i: Throw 0.69 to 0.83. Screen width 120 × 16 / √337 = 104.59 inches. BenQ X3100i: Throw 1.15 to 1.50. Distance = image width × throw ratio.
A bigger picture can consume the entire output upgrade
Moving from a 120-inch to a 150-inch picture increases image area by about 56 percent. X3100i’s rated output rises by 50 percent over X500i. At equal gain and comparable modes, the output increase alone would not fully preserve light per unit area on that larger screen.
How we reached this conclusion
BenQ X500i: 2,200 ANSI-lumen rating. BenQ X3100i: 3,300 ANSI-lumen rating. (150 / 120)² = 1.5625. This is a geometric illustration, not measured screen brightness.
Pay for installation and light rather than lower listed lag
Both publish the same 4K60 and high-refresh 1080p latency values. If the short-throw room fits X500i, the X3100i premium has no documented latency advantage at those settings. The useful reasons to move up are its placement controls and output.
How we reached this conclusion
BenQ X500i: 16.7, 8.3 and 4.2 ms for the listed formats. BenQ X3100i: Identical manufacturer values for those formats. Processing settings still matter.
Try your real numbers
Will either projector fit your room?
The result checks hard limits only. Preferences stay out of the calculation.
BenQ X500i
Does not fit these inputsFor a 120-inch 16:9 picture, the manual-table lens range is about 6.01 to 7.23 ft. Your input is 9.50 ft. Optical fit only: use the 1.2x optical zoom, level square placement at the fixed image height, body/cable space, 50 cm wall clearance and free airflow. No optical lens shift. For image quality, BenQ recommends the manual’s non-gray table rows. Test the actual image before mounting. Digital correction adds no optical range.
BenQ X3100i
Does not fit these inputsFor a 120-inch 16:9 picture, the calculated lens range is about 10.02 to 13.07 ft. Your input is 9.50 ft.
Distance is measured from the lens to the screen. The calculation uses a 16:9 image and the verified optical throw range for each exact model.
Choice A
BenQ, X500i
X500i
A short-throw 4LED gaming projector for putting a big image in front of a desk or sofa without using the full depth of the room.
- Best matched use
- The lens must sit about six to seven feet from a 120-inch screen
Checked facts
- Optical throw range: 0.69 to 0.83
- Published output: 2,200 ANSI lumens
- Published input lag: 16.7 ms at 4K60, 8.3 ms at 1080p120, 4.2 ms at 1080p240
- Placement adjustment: Short-throw zoom, no optical lens shift
Choice B
BenQ, X3100i
X3100i
A color-rich 4LED gaming projector with low latency, broad resolution support, Android TV and a substantial vertical shift range.
- Best matched use
- The lens can sit ten to thirteen feet from a 120-inch screen
Checked facts
- Optical throw range: 1.15 to 1.50
- Published output: 3,300 ANSI lumens
- Published input lag: The same three figures
- Placement adjustment: Longer throw with vertical lens shift
Meaningful differences
What changes the fit
| What changes | BenQ X500i | BenQ X3100i | Why it matters |
|---|---|---|---|
| Optical throw range | 0.69 to 0.83 | 1.15 to 1.50 | These ranges do not overlap for the same picture size. |
| Published output | 2,200 ANSI lumens | 3,300 ANSI lumens | X3100i has 50 percent more rated output, not a verified 50 percent brighter calibrated picture. |
| Published input lag | 16.7 ms at 4K60, 8.3 ms at 1080p120, 4.2 ms at 1080p240 | The same three figures | The higher tier does not improve these manufacturer latency claims. |
| Placement adjustment | Short-throw zoom, no optical lens shift | Longer throw with vertical lens shift | Shift helps with height placement. It cannot shorten the required room depth. |
| Streaming | Included Android TV device | Included Android TV device | Both include a streaming route without a separate shopping decision. |
What you give up
Every choice has a cost
If you choose BenQ X500i
- The short lens is a poor match for some rear shelves in deeper rooms.
If you choose BenQ X3100i
- Independent testing found weaker dark-scene contrast and noted that 1440p input is internally downscaled.
Recommendation switch
The decision flips if...
The lens must sit about six to seven feet from a 120-inch screen
Choose BenQ X500i. Short throw keeps the projector ahead of the main seating
The lens can sit ten to thirteen feet from a 120-inch screen
Choose BenQ X3100i. Vertical lens shift is useful for the mount position
What the facts say
What the comparison shows
Useful conclusions from the current home projectors comparison, followed by the checked facts used to reach them.
See the checked facts and calculation notes
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| BenQ X500i |
|
| |
| BenQ X3100i |
|
|
Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
BenQ X500i
The lens must sit about six to seven feet from a 120-inch screen
See price & reviews on AmazonBenQ X3100i
The lens can sit ten to thirteen feet from a 120-inch screen
See price & reviews on AmazonLinks open in a new tab.