Phone Comparison - Oppo K7x vs Xiaomi Redmi Note 9 Pro 5G vs Samsung Galaxy S21 Ultra 5G

general General Info

Manufacturer Oppo Xiaomi Samsung
Announced November 2020 2020, November 26 2021, January 14
Status Coming Soon - November 2020 Coming soon. Exp. release 2020, December Coming soon. Exp. release 2021, January 29
Price - - Rs. 105,999 ($0.00) [Similarly Priced]
Colors Blue, Black Gray, Blue, Red/Mint Phantom Black, Phantom Silver, Phantom Titanium, Phantom Navy, Phantom Brown
Form Factor Candybar Candybar Candybar
Dimension 162.2 x 75.1 x 9.1 mm
(6.39 x 2.96 x 0.36 in)
165.4 x 76.8 x 9 mm
(6.51 x 3.02 x 0.35 in)
165.1 x 75.6 x 8.9 mm
(6.5 x 2.98 x 0.35 in)
Weight 194 g (6.84 oz) 215 g (7.58 oz) 227 g (8.01 oz)
SIM Type Dual SIM (Nano-SIM, dual stand-by) Dual SIM (Nano-SIM, dual stand-by) Single SIM (Nano-SIM and/or eSIM), Hybrid Dual SIM (Nano-SIM, dual stand-by)
2G Network GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
CDMA2000 1xEV-DO
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (Dual SIM model only)
CDMA2000 1xEV-DO
3G Network HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100 HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G Network 1, 2, 3, 4, 5, 7, 8, 34, 38, 39, 40, 41 1, 3, 5, 7, 8, 34, 38, 39, 40, 41 LTE
5G Network 1, 41, 77, 78 SA/NSA 1, 3, 41, 78, 79 SA/NSA/Sub6 SA/NSA/Sub6/mmWave
Messaging
Build Features - Fingerprint Sensor (side-mounted)
- Fingerprint Sensor (side-mounted)
- Fingerprint Sensor (under display, ultrasonic)
Samsung Pay (Visa, MasterCard certified)
IP68 dust/water resistant (up to 1.5m for 30 mins)
Stylus support
Samsung DeX, Samsung Wireless DeX (desktop experience support) ANT+

hardware Hardware and OS

OS Android 10 Android 10 Android 11
User Interface ColorOS 7.2 MIUI 12 One UI 3.0
Processor Octa-core (2x2.0 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55), MediaTek MT6853V Dimensity 720 5G (7 nm) Octa-core (2x2.2 GHz Kryo 570 & 6x1.8 GHz Kryo 570), Qualcomm SM7225 Snapdragon 750G 5G (8 nm) Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - International / Octa-core (1x2.84 GHz Kryo 680 & 3x2.42 GHz Kryo 680 & 4x1.80 GHz Kryo 680 - USA/China/Korea, Exynos 2100 - Global / Qualcomm Snapdragon 875 - USA
GPU Mali-G57 MC3 Adreno 619 Mali-G78 MP14 - International / Adreno 660 - USA/China/Korea
RAM 6 GB 8 GB 16 GB
Internal Memory 128 GB 256 GB 512 GB
External Memory No microSDXC (uses shared SIM slot) microSDXC (uses shared SIM slot)

display Display

Type LTPS IPS LCD Screen
Corning Gorilla Glass 3
90Hz Refresh rate
480 nits (typ), 600 nits (peak)
IPS LCD Screen
Corning Gorilla Glass 5
120Hz Refesh Rate
HDR10
450 nits (typ)
QHD+ Dynamic AMOLED 2X Display
120Hz Refresh Rate
HDR10+
1500 nits (peak)
Corning Gorilla Glass Victus
Always-on display
Colors 16M Colour 16M Colour 16M Colour
Size 6.5 inches 6.67 inches 6.8 inches
Resolution 1080 x 2400 pixels (405 ppi) 1080 x 2400 pixels (395 ppi) 1440 x 3200 pixels (516 ppi)
Screen-to-Body Ratio 83.70% 84.37% 89.46%
Multi-Touch yes yes yes

multimedia Multimedia

3.5mm Jack yes yes no
Radio No Unspecified FM radio (Snapdragon model only; market/operator dependent)
Games Yes + Downloadable Yes + Downloadable Yes + Downloadable
Loud Speaker yes yes yes

camera Camera

Rear Camera 48 MP + 8 MP + 2 MP + 2 MP 108 MP + 8 MP + 2 MP + 2 MP 108 MP + 10 MP + 10 MP + 12 MP + 0.3 MP
Flash LED flash Dual-LED dual-tone flash LED flash
Features 48 MP, f/1.7, 25mm (wide), 1/2.0", 0.8µm, PDAF
8 MP, f/2.2, 119˚ (ultrawide), 1/4.0", 1.12µm
2 MP, f/2.4, (macro)
2 MP, f/2.4, (depth)
HDR, panorama
108 MP, f/1.75, 26mm (wide), 1/1.52", 0.8µm, PDAF
8 MP, f/2.2, 118˚ (ultrawide), 1/4.0", 1.12µm
2 MP, f/2.4, (macro)
2 MP, f/2.4, (depth)
HDR, panorama
108 MP (2nd gen), f/1.8, 26mm (wide), 1/1.33", 0.8µm, PDAF, Laser AF, OIS
10 MP, f/4.9, 240mm (periscope telephoto), 1/3.24", 1.22µm, dual pixel PDAF, OIS, 10x optical zoom
10 MP, f/2.4, 70mm (telephoto), 1/3.24", 1.22µm, dual pixel PDAF, OIS, 3x optical zoom
12 MP, f/2.2, 13mm (ultrawide), 1/2.55", 1.4µm, dual pixel PDAF, Super Steady video
auto-HDR, panorama
Video 4K@30fps, 1080p@30/60/120fps; gyro-EIS 4K@30fps, 1080p@30fps 8K@24fps, 4K@30/60fps, 1080p@30/60/240fps, 720p@960fps, HDR10+, stereo sound rec., gyro-EIS
Front Camera 16 MP, f/2.0, 26mm (wide), 1/3.06", 1.0µm
HDR
1080p@30fps [Similar]
16 MP, f/2.0
HDR, panorama
1080p@30fps [Similar]
40 MP, f/2.2, 26mm (wide), 0.7µm, PDAF
Dual video call, Auto-HDR
4K@30/60fps, 1080p@30fps [Similar]

connectivity Connectivity and Data Rate

GPRS Yes Yes Yes
Edge Yes Yes Yes
3G HSPA 42.2/5.76 Mbps, LTE-A (CA), 5G 2.3 Gbps DL HSPA 42.2/5.76 Mbps, LTE-A, 5G HSPA 42.2/5.76 Mbps, LTE-A (CA), 5G
Bluetooth 5.0, A2DP, LE, aptX HD 5.0, A2DP, LE 5.2, A2DP, LE
Wi-Fi Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct, hotspot
USB USB Type-C 2.0, USB On-The-Go USB Type-C 2.0 USB Type-C 3.2, USB On-The-Go
GPS Yes, with A-GPS, GLONASS, GALILEO, BDS Yes, with A-GPS, GLONASS, GALILEO, BDS Yes, with A-GPS, GLONASS, BDS, GALILEO
Browser Yes Yes Yes

memory User Memory

Internal 128 GB, 6 GB RAM UFS 2.1 256 GB, 8 GB RAM or 128 GB, 8 GB RAM or 128 GB, 6 GB RAM UFS 2.2 512 GB, 16 GB RAM or 256 GB, 12 GB RAM or 128 GB, 12 GB RAM UFS 3.1
Expandable Storage No microSDXC (uses shared SIM slot) microSDXC (uses shared SIM slot)
USB OTG Supported Supported Supported

Apps Sensors

Fingerprint fingerprint supported fingerprint supported fingerprint supported
Proximity Sensor proximity sensor present proximity sensor present proximity sensor present
Accelerometer Sensor accelerometer sensor present accelerometer sensor present accelerometer sensor present
Magnetic-Field Sensor (Compass) magnetic field sensor present magnetic field sensor present magnetic field sensor present
Gyroscope Sensor gyroscope sensor present gyroscope sensor present gyroscope sensor present
Barometer Sensor barometer sensor not present barometer sensor not present barometer sensor present
NFC NFC not supported NFC not supported NFC supported

battery Battery

Type Non-removable Li-Po Battery
Fast battery charging 30W, 100% in 65 min (advertised)
Reverse charging
Non-removable Li-Po Battery
Fast battery charging 33W
Non-removable Li-Po Battery
Fast battery charging 25W
USB Power Delivery 3.0
Fast Qi/PMA wireless charging 15W
Reverse wireless charging 4.5W
Capacity 5000 mAh 4820 mAh 5000 mAh
Stand by - - -
Talk Time - - -