Between the X40 Ultra and X50 Ultra, the X40 Ultra comes out ahead in several specs, while the X50 Ultra wins on suction and water tank. Overall, the X40 Ultra scores 70.7 and the X50 Ultra scores 84 on our Mars Score.
Which should you buy?
The X50 Ultra is the clear pick on raw spec strength, leading by 13.3 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
The X40 Ultra doesn't pull ahead on any single popular-comparison spec — its strengths sit in the spec table groups rather than the headline advantages.
Pick the X50 Ultra if you care most about suction and water tank. Its strongest claims are suction, water tank, noise.
Both ship with comparable mopping, lidar, battery life, so those specs don't separate the two — focus on the differences below.
Bottom line: the X50 Ultra is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Dreame - X40 Ultra wins
- No decisive advantages.
Why Dreame - X50 Ultra wins
- ▲Suction — 66.67% more. 20000 Pa vs 12000 Pa.
- ▲Water tank — 3.70% more. 280 ml vs 270 ml.
- ▲Noise — 2.00 dB less. 63 vs 65.
Spec comparison
Cleaning
| Spec | Dreame - X40 Ultra | Dreame - X50 Ultra |
|---|---|---|
| Suction | 12000 Pa | 20000 Palead |
| Mopping | true | true |
| Water tank | 270 ml | 280 mllead |
| Dustbin | 350 ml | 350 ml |
| Carpet detection | true | true |
Navigation
| Spec | Dreame - X40 Ultra | Dreame - X50 Ultra |
|---|---|---|
| Lidar | true | true |
| Camera navigation | true | true |
| AI obstacle avoidance | true | true |
| Max climb | 60 mm | 60 mm |
Autonomy
| Spec | Dreame - X40 Ultra | Dreame - X50 Ultra |
|---|---|---|
| Battery life | 210 min | 210 min |
| Self-empty base | true | true |
| Self-wash mop | true | true |
| Self-dry mop | true | true |
| Noise | 65 dB | 63 dBlead |
Frequently asked
Which has stronger suction, X40 Ultra or X50 Ultra?+
X50 Ultra delivers 20000 Pa vs 12000 Pa.
Do X40 Ultra or X50 Ultra mop?+
Both can mop.
Which has a self-emptying base, X40 Ultra or X50 Ultra?+
Both ship with a self-emptying base.
Spec-level deep dives
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