Dreame X40 Ultra
Dreame’s 2024 flagship, now hard to find new; worth it only at a deep discount, as the X50 and L-series robots clean better.
AmazonThe Dreame X40 Ultra and the Roborock S8 MaxV Ultra are evenly matched, rated 3.8 and 3.8. The Dreame X40 Ultra leads on mopping. The Roborock S8 MaxV Ultra wins on dock.
Roborock S8 MaxV Ultra Discontinued
A former flagship now superseded by the Saros 10; only worth buying at a deep clearance price.
AmazonPrices were last checked October 26, 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 Dreame X40 Ultra for mopping (Dual spinning pads, leaves its mop at the dock for carpet, extends to edges vs Vibrating pad, lifts 20 mm).
- Choose the Roborock S8 MaxV Ultra for dock (Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent, optional water hookup vs Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every self-cleaning dock robot vacuum; a clear win is highlighted. How we rank explains each one.
| Factor weight | Dreame X40 Ultra | Roborock S8 MaxV Ultra |
|---|---|---|
| Overall rating | 3.8/5 | 3.8/5 |
| Cleaning 30% | 37 measured 80% of sand from carpet, 75.5% of pet hair, some hair tangled (0.8) | 42 measured 82% of sand from carpet, 76% of pet hair, some hair tangled (0.6) |
| Value 25% | 50 no current price (neutral score used) | 50 no current price (neutral score used) |
| Dock 20% | 90 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent, optional water hookup |
| Navigation 15% | 100 LiDAR + camera | 100 LiDAR + camera |
| Mopping 10% | 86 Dual spinning pads, leaves its mop at the dock for carpet, extends to edges | 46 Vibrating pad, lifts 20 mm |
Independent tests
Dreame X40 Ultra
| Tested by | Carpet deep clean | Pet hair | Hair tangle (0 = none) | Area per charge | Conditions |
|---|---|---|---|---|---|
| Vacuum Wars | 80% | 75.5% | 0.8 | 1,287 sq ft | Embedded sand in medium-pile carpet; flattened 2.5 in pet hair on carpet, two runs; 7 in hair tangle on hard floor (0 = none wrapped). |
Roborock S8 MaxV Ultra
| Tested by | Carpet deep clean | Pet hair | Hair tangle (0 = none) | Area per charge | Conditions |
|---|---|---|---|---|---|
| Vacuum Wars | 82% | 76% | 0.6 | 889 sq ft | Embedded sand in medium-pile carpet; flattened 2.5 in pet hair on carpet, two runs; 7 in hair tangle on hard floor (0 = none wrapped). |
Specifications
| Dreame X40 Ultra | Roborock S8 MaxV Ultra | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 12,000 Pa | 10,000 Pa |
| Main brush | Liftable rubber brush (TriCut Brush 2.0 sold separately) | dual rubber rollers |
| Dustbin | 300 mL | - |
| Extending side brush | Yes | Yes |
| Mopping | ||
| Mop | Dual spinning pads, leaves its mop at the dock for carpet, extends to edges | Vibrating pad, lifts 20 mm |
| Mop lift | 10.5 mm | 20 mm |
| Leaves mop at dock | Yes | No |
| Extending mop | Yes | No |
| Water tank | 80 mL | - |
| Dock | ||
| Dock | Washes mop + empties | Washes mop + empties |
| Self-empties | Yes | Yes |
| Dust bag | 3.2 L | - |
| Washes mop | Yes | Yes |
| Hot-water wash | Yes | Yes |
| Hot-air drying | Yes | Yes |
| Detergent dosing | Yes | Yes |
| Water hookup option | No | Yes |
| Clean water tank | 4.5 L | - |
| Navigation & app | ||
| Navigation | LiDAR + camera | LiDAR + camera |
| Obstacle avoidance | RGB camera plus 3D structured light, recognises 120 object types | 3D structured light and RGB camera |
| Climbs thresholds | 22 mm | - |
| Voice assistants | Alexa, Siri, Google Home | Alexa, Google Assistant, Siri |
| Build | ||
| Height | - | 4.1 in (103 mm) |
| Retracting LiDAR | - | No |
| Battery | 6,400 mAh | 5,200 mAh |
| Warranty | 3 years | 1 year |
| Released | 2024-04 | 2024-04 |