Phone Comparison - Oppo K7x vs Xiaomi Redmi Note 9 Pro 5G vs Samsung Galaxy S21 Ultra 5G
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| 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+ |
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| 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) |
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| 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 |  |
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| 3.5mm Jack | |
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| Radio | No | Unspecified | FM radio (Snapdragon model only; market/operator dependent) |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| 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] |
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| 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 |
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| 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 |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| Magnetic-Field Sensor (Compass) | |
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| Gyroscope Sensor | |
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| Barometer Sensor | |
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| NFC | |
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| 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 | - | - | - |
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