Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Dreame - X40 Ultra | Dreame - X50 Ultra |
|---|---|---|
| Suction | 12000 Pa | 20000 Pa |
| Water tank | 270 ml | 280 ml |
| Noise | 65 dB | 63 dB |
Between the X40 Ultra and X50 Ultra, the X40 Ultra comes out ahead in several specs, while the X50 Ultra wins on suction / water tank. Overall, the X40 Ultra scores 83.9 and the X50 Ultra scores 88.5 on our Mars Score.
Which should you buy?
The X50 Ultra edges ahead on the Mars Score (83.9 vs 88.5), but the 4.6-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The X40 Ultra does not 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 / water tank. Its strongest claims are suction, water tank, noise. The single most decisive one: Suction — 66.67% more. 20000 Pa vs 12000 Pa.
Both ship with comparable mopping, lidar, battery life, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Dreame - X40 Ultra or Dreame - X50 Ultra?
Dreame - X50 Ultra leads the current Mars Score by 4.6 points.The more useful decision is the trade-off behind that result: compare suction against the way you will actually use the product.
Choose Dreame - X40 Ultra if…
Dreame - X40 Ultra does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Dreame - X50 Ultra if…
Dreame - X50 Ultra has the measurable edge on suction pa, water tank capacity ml, noise db.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
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.