Dreame X40 Ultra vs. Roborock S8 MaxV Ultra
The Dreame X40 Ultra pushes edge and corner cleaning further with dual bionic articulated arms (both MopExtend for baseboards and SideReach for 90° corners) along with 12,000 Pa suction and a 70°C hot-water wash station that dissolves kitchen oils. The Roborock S8 MaxV Ultra counters with dual rubber rollers and slightly faster app mapping. Choose the X40 Ultra for peak edge reach and hot-water sanitization; choose the S8 MaxV Ultra for deep carpet agitation.
Dreame X40 Ultra
- Suction 12,000 Pa
- Navigation LiDAR
- Mopping Self-Wash Mopping
- Base / Dock Auto-Empty
Roborock S8 MaxV Ultra
- Suction 10,000 Pa
- Navigation LiDAR
- Mopping Self-Wash Mopping
- Base / Dock Auto-Empty
The Quick Verdict
The Dreame X40 Ultra pushes edge and corner cleaning further with dual bionic articulated arms (both MopExtend for baseboards and SideReach for 90° corners) along with 12,000 Pa suction and a 70°C hot-water wash station that dissolves kitchen oils. The Roborock S8 MaxV Ultra counters with dual rubber rollers and slightly faster app mapping. Choose the X40 Ultra for peak edge reach and hot-water sanitization; choose the S8 MaxV Ultra for deep carpet agitation.
Winner: Dreame X40 Ultra Robot Vacuum & Mop
The Dreame X40 Ultra represents the cutting edge of robotic floorcare. Combining dual bionic articulated arms for mops and side brush with 12,000Pa suction and 70°C thermal pad washing, it leaves virtually no room corner or baseboard perimeter uncleaned.
Runner Up: Roborock S8 MaxV Ultra
If money is no object, the S8 MaxV Ultra is the robot to beat: the highest rated suction in our database, a strong mapping reputation and the most mature software. Its only real competition is on price, where the JONR X9 Pro gets uncomfortably close on features for under half the cost.
- You want the most comprehensive corner and baseboard edge coverage available in robotics
- You have kitchen tile or hardwood floors prone to sticky residues that need 70°C hot-water washing
- 10,000 Pa suction, FlexiArm corner coverage, and the highest BVC app & smart-home score in our database.
Our Takeaway: Dreame X40 Ultra earns our overall recommendation (9.6/10 vs 9.4/10) for dual robotic arms & 70°c hot water vs. dual rubber rollers, while Roborock S8 MaxV Ultra remains a viable choice if saving $200.99 is your top priority.
Vacuuming & Carpet Performance
Comparing raw suction power, agitating roller architectures, and measured particle pickups.
Dreame X40 Ultra (12,000 Pa)
Dual robotic arms with MopExtend RoboSwing and SideReach side brush, 12,000Pa Vormax suction, and 70°C hot-water mop washing.
- Dual robotic arms: MopExtend reaches baseboards and SideReach swings the side brush into 90° corners
- 12,000Pa Vormax suction extracts deeply embedded dust and pet hair from thick rugs
- 70°C hot-water dock sanitizes mop pads and features motorized scraper blades for the washplate
Roborock S8 MaxV Ultra (10,000 Pa)
10,000 Pa suction, FlexiArm corner coverage, and the highest BVC app & smart-home score in our database.
- Class-leading 10,000 Pa suction and dual rubber rollers for deep carpet
- FlexiArm side brush and extending mop reach right into corners
- Best-in-class app with remote video, voice assistant and Matter
Mopping Systems & Hard Floor Care
Scrubbing mechanics, continuous fresh water delivery, and pad maintenance.
Dreame X40 Ultra: Self-Washing Dock
Dreame X40 Ultra delivers automated hard floor scrubbing with active moisture control.
- 70°C Hot-Water Mop Washing
- Hot-Air Drying
- Auto-Water Refill
- Self-Cleaning Washplate
- Automated surface detection & pad lift
Roborock S8 MaxV Ultra: Self-Washing Dock
Roborock S8 MaxV Ultra delivers automated hard floor scrubbing with active moisture control.
- Auto-Mop Washing
- Hot-Air Drying
- Auto-Water Refill
- Automated surface detection & pad lift
Technical Specifications
Full side-by-side specification table with lab-verified attributes and highlighted category leaders.
| Feature | Dreame X40 Ultra | Roborock S8 MaxV Ultra |
|---|---|---|
| Street Price | $1,499.99 | $1,299 |
| List Price | $1,899.99 | $1,799 |
| Overall BVC Score | 9.6 / 10 | 9.4 / 10 |
| Suction Rating | 12,000 Pa | 10,000 Pa |
| Rated Runtime | 260 min | 180 min |
| Sound Level | 63 dB | 67 dB |
| Navigation System | LiDAR | LiDAR |
| Obstacle Avoidance | AI RGB Camera + 3D Structured Light + LED Night Light | Reactive AI 2.0 (RGB camera + structured light) |
| Mopping System | Yes (Active Mop) | Yes (Active Mop) |
| Dustbin / Bag Capacity | 300 ml (75-day dock bag) | 270 ml (50-day dock bag) |
| Dock Automation | Auto-Empty, 70°C Hot-Water Mop Washing, Hot-Air Drying, Auto-Water Refill, Auto-Detergent Dispense, Self-Cleaning Washplate | Auto-Empty, Auto-Mop Washing, Hot-Air Drying, Auto-Water Refill |
| Smart Ecosystems | Alexa, Google Home, Siri Shortcuts | Alexa, Google Home, Matter, Apple Home, Siri Shortcuts, Home Assistant |
The Case For & Against
Dreame X40 Ultra
The Case For It
- +Dual robotic arms: MopExtend reaches baseboards and SideReach swings the side brush into 90° corners
- +12,000Pa Vormax suction extracts deeply embedded dust and pet hair from thick rugs
- +70°C hot-water dock sanitizes mop pads and features motorized scraper blades for the washplate
The Case Against
- –All-in-one dock has a substantial footprint requiring vertical clearance for lid access
- –Premium investment compared to mid-range robot vacuums
Roborock S8 MaxV Ultra
The Case For It
- +Class-leading 10,000 Pa suction and dual rubber rollers for deep carpet
- +FlexiArm side brush and extending mop reach right into corners
- +Best-in-class app with remote video, voice assistant and Matter
- +Dock also refills the robot's water tank and dispenses detergent
- +Independently measured 93.9% debris removal on high-pile carpet and 99.8% on hardwood
The Case Against
- –Street price is still around $1,300
- –Mop pads spin rather than scrub, so dried stains take multiple passes
- –Dock is large (48 cm tall) and needs a 5 cm clearance each side
- –The onboard voice assistant and auto-extending side brush have been reported unreliable in independent testing
- –Struggles with fine granular debris (sugar, litter) worked into carpet fibers