Microsoft Surface Duo 2
#664
Xiaomi Redmi K40
#1112Category Breakdown
Microsoft Surface Duo 2
Xiaomi Redmi K40
Performance
90.190.5
Camera
86.868.1
Display
87.793.7
Battery
30.231.0
Build
81.90.2
Connectivity
87.683.5
Audio
87.687.6
Overall
72.563.0
Summary
- The Microsoft Surface Duo 2 features a unique foldable design with a glass front and back, weighing 284g, while the Xiaomi Redmi K40 has a more traditional build at 196g.
- The Surface Duo 2 offers an 8.3-inch AMOLED display with a resolution of 1892 x 2688 pixels and a 90Hz refresh rate, compared to the K40's 6.67-inch Super AMOLED display at 1080 x 2400 pixels with a 120Hz refresh rate.
- In terms of performance, the Surface Duo 2 is powered by the Snapdragon 888, while the K40 uses the Snapdragon 870, with both having 128GB of storage options but differing RAM configurations.
- The camera setup on the K40 is more versatile with a 48 MP main sensor, whereas the Duo 2 has a 12 MP system, though it includes a telephoto and ultrawide lens.
- Battery capacity is slightly higher in the K40 at 4520mAh versus the Duo 2's 4449mAh, with faster charging at 33W compared to 23W.
- Both devices run Android 11, but the K40 features MIUI 12 for a different software experience.
Side-by-side Specification Comparison
Microsoft Surface Duo 2
Xiaomi Redmi K40
General
Release Date
2021, September 22
2021, February 25
Announced
2021, September 22
2021, February 25
Description
N/A
N/A
Display
Size
8.3"
6.67"
Type
AMOLED, 90Hz, HDR, 800 nits (peak)
Super AMOLED, 120Hz, HDR10+, 1300 nits (peak)
Resolution
1892 x 2688 pixels (~401 ppi density)
1080 x 2400 pixels, 20:9 ratio (~395 ppi density)
PPI
1892
1080
Refresh Rate
90Hz
120Hz
HDR Support
✓
✓
Protection
Corning Gorilla Glass Victus
Corning Gorilla Glass 5
Performance
Chipset
Qualcomm SM8350 Snapdragon 888 5G (5 nm)
Qualcomm SM8250-AC Snapdragon 870 5G (7 nm)
CPU
Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55)
Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585)
GPU
Adreno 660
Adreno 650
Memory
128GB 8GB RAM, 256GB 8GB RAM, 512GB 8GB RAM
128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM
Expandable Storage
✗
✗
Card Slot
No
No
Camera
Main Camera
12 MP, f/1.7, 27mm (wide), 1.4µm, dual pixel PDAF, OIS12 MP, f/2.4, 51mm (telephoto), 1.0µm, PDAF, OIS, 2x optical zoom16 MP, f/2.2, 13mm (ultrawide), 1.0µmTOF 3D, (depth)
48 MP, f/1.8, 26mm (wide), 1/2.0", 0.8µm, PDAF8 MP, f/2.2, 119˚ (ultrawide)5 MP, f/2.4, 50mm (macro), 1/5.0", 1.12µm
Main Camera Features
Dual-LED dual-tone flash, HDR, panorama
Color spectrum sensor, LED flash, HDR, panorama
Front Camera
12 MP, f/2.0, 24mm (wide), 1.0µm
20 MP, f/2.5, (wide), 1/3.4", 0.8µm
Front Camera Features
N/A
HDR
Video Recording
4K@30/60fps, 1080p@30/60/120/240fps, gyro-EIS, HDR
4K@30fps, 1080p@30/60/120/240/960fps, gyro-EIS
Selfie Video
1080p@30fps
1080p@30fps, 720p@120fps
Optical Stabilization
✓
✗
Night Mode
✗
✗
Raw Photo Support
✗
✗
Battery
Capacity
4449 mAh
4520 mAh
Battery Details
Li-Po 4449 mAh
Li-Po 4520 mAh
Charging Details
23W wired
33W wired, PD3.0, QC3, 100% in 52 min
Fast Charging
✗
✗
Wireless Charging
✗
✗
Build & Safety
Dimensions
Unfolded: 184.5 x 145.2 x 5.5 mmFolded: 145.2 x 92.1 x 11 mm
163.7 x 76.4 x 7.8 mm (6.44 x 3.01 x 0.31 in)
Weight
284 g
196 g
Materials
Glass front (Gorilla Glass Victus), glass back (Gorilla Glass)
N/A
Colors
Glacier, Obsidian
Black, White, Aurora
Foldable
✗
✗
SAR
N/A
N/A
Connectivity
SIM
Nano-SIM +eSIM
Nano-SIM + Nano-SIM
Network
GSM / HSPA / LTE / 5G
GSM / CDMA / HSPA / CDMA2000 / LTE / 5G
Network Speed
HSPA 42.2/5.76 Mbps, LTE (5CA) Cat20 2000/150 Mbps, 5G 6 Gbps DL
HSPA, LTE, 5G
5G
✓
✓
4G
✓
✓
WiFi
Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
Bluetooth
5.1, A2DP, LE, aptX Adaptive
5.1, A2DP, LE
NFC
✓
✓
USB
USB Type-C 3.2, DisplayPort
USB Type-C 2.0, OTG
IR Blaster
✗
✗
Headphone Jack
✗
✗
Radio
✗
✗
Positioning
GPS, GLONASS, GALILEO, QZSS, BDS
GPS (L1+L5), GLONASS (G1), BDS (B1I+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC
Audio
Stereo Speakers
✓
✓
Loudspeaker
Yes, with stereo speakers
Yes, with stereo speakers
Audio Jack
No
No
Software & Security
Operating System
Android 11
Android 11, MIUI 12
Fingerprint
✓
✓
Face Unlock
✗
✗
Sensors
Fingerprint (side-mounted), dual accelerometer, dual gyro, dual proximity, dual compass
Fingerprint (side-mounted), accelerometer, gyro, proximity, compass