Samsung Galaxy A51
#1660
Xiaomi Mi 9X
#1729Category Breakdown
Samsung Galaxy A51
Xiaomi Mi 9X
Performance
76.876.2
Camera
64.768.0
Display
82.882.8
Battery
28.126.1
Build
88.10.2
Connectivity
62.765.6
Audio
8.98.9
Overall
56.255.5
Summary
- The Samsung Galaxy A51 features a larger 6.5-inch Super AMOLED display with a resolution of 1080 x 2400 pixels, while the Xiaomi Mi 9X has a slightly smaller 6.39-inch Super AMOLED display at 1080 x 2340 pixels.
- In terms of performance, the A51 is powered by the Exynos 9611 chipset, whereas the Mi 9X uses the Snapdragon 675, with both offering 64GB of storage but differing RAM configurations.
- Camera-wise, both phones have a 48 MP main sensor, but the Mi 9X includes an additional telephoto lens for optical zoom, while the A51 has a macro and depth sensor.
- The A51 has a 4000 mAh battery compared to the 3300 mAh battery in the Mi 9X, providing longer usage time, though the Mi 9X supports slightly faster charging at 18W.
- Software experience differs as the A51 runs on Android 10 with One UI 5, while the Mi 9X operates on Android 9.0 with MIUI 10, and the A51 includes a headphone jack, unlike the Mi 9X.
Side-by-side Specification Comparison
Samsung Galaxy A51
Xiaomi Mi 9X
General
Release Date
2019, December 12
N/A
Announced
2019, December 12
N/A
Description
Also available with 5GVersions: SM-A515F/DSN (Global); SM-A515F/DS (LATAM); SM-A515F/DST (Brazil); SM-A515F/DSM (Russia); SM-A515F/N (Australia); SM-A515U (USA)
Unofficial preliminary specifications
Display
Size
6.5"
6.39"
Type
Super AMOLED
Super AMOLED
Resolution
1080 x 2400 pixels, 20:9 ratio (~405 ppi density)
1080 x 2340 pixels, 19.5:9 ratio (~403 ppi density)
PPI
1080
1080
Refresh Rate
60Hz
60Hz
HDR Support
✗
✗
Protection
Corning Gorilla Glass 3
N/A
Performance
Chipset
Exynos 9611 (10 nm)
Qualcomm SDM675 Snapdragon 675 (11 nm)
CPU
Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53)
Octa-core (2x2.0 GHz Kryo 460 Gold & 6x1.7 GHz Kryo 460 Silver)
GPU
Mali-G72 MP3
Adreno 612
Memory
64GB 4GB RAM, 128GB 4GB RAM, 128GB 6GB RAM, 128GB 8GB RAM, 256GB 6GB RAM, 256GB 8GB RAM
64GB 6GB RAM
Expandable Storage
✗
✗
Card Slot
microSDXC (dedicated slot)
No
Camera
Main Camera
48 MP, f/2.0, 26mm (wide), 1/2.0", 0.8µm, PDAF12 MP, f/2.2, 123˚ (ultrawide)5 MP, f/2.4, (macro)5 MP, f/2.2, (depth)
48 MP, f/1.8, 27mm (wide), 1/2.0", 0.8µm, PDAF8 MP, (telephoto), PDAF, 2x optical zoom13 MP, (wide)
Main Camera Features
LED flash, panorama, HDR
Dual-LED flash, HDR, panorama
Front Camera
32 MP, f/2.2, 26mm (wide), 1/2.8", 0.8µm
32 MP, f/2.0, 26mm (wide), 1/2.8", 0.8µm
Front Camera Features
HDR
HDR
Video Recording
4K@30fps, 1080p@30/120fps; gyro-EIS
4K@30/60fps, 1080p@30/120/240fps, 1080p@960fps
Selfie Video
4K@30fps, 1080p@30fps
1080p@30fps
Optical Stabilization
✗
✗
Night Mode
✗
✗
Raw Photo Support
✗
✗
Battery
Capacity
4000 mAh
3300 mAh
Battery Details
Li-Po 4000 mAh, non-removable
Li-Po 3300 mAh, non-removable
Charging Details
15W wired
18W wired
Fast Charging
✗
✗
Wireless Charging
✗
✗
Build & Safety
Dimensions
158.5 x 73.6 x 7.9 mm (6.24 x 2.90 x 0.31 in)
N/A
Weight
172 g
N/A
Materials
Glass front (Gorilla Glass 3), plastic back, plastic frame
N/A
Colors
Prism Crush Black, Prism Crush White, Prism Crush Blue, Prism Crush Pink
Various
Foldable
✗
✗
SAR
0.80 W/kg (head) 0.67 W/kg (body)
N/A
Connectivity
SIM
Nano-SIMNano-SIM + Nano-SIM
Nano-SIM + Nano-SIM
Network
GSM / HSPA / LTE
GSM / CDMA / HSPA / LTE
Network Speed
HSPA, LTE
HSPA, LTE
5G
✗
✗
4G
✓
✓
WiFi
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA
Bluetooth
5.0, A2DP, LE
5.0, A2DP, LE, aptX HD
NFC
✓
✓
USB
USB Type-C 2.0, OTG
USB Type-C 2.0, OTG
IR Blaster
✗
✗
Headphone Jack
✓
✗
Radio
✗
✗
Positioning
GPS, GLONASS, GALILEO, BDS
GPS, GLONASS, GALILEO
Audio
Stereo Speakers
✗
✗
Loudspeaker
Yes
Yes
Audio Jack
Yes
No
Software & Security
Operating System
Android 10, upgradable to Android 13, One UI 5
Android 9.0 (Pie), MIUI 10
Fingerprint
✓
✓
Face Unlock
✗
✗
Sensors
Fingerprint (under display, optical), accelerometer, gyro, compass
Fingerprint, accelerometer, gyro, proximity, compass