| Samsung Galaxy S21 Ultra 5G |
Xiaomi Redmi Note 8 |
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| Hardware and OS | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| Operating system | Android 11, One UI 3.1 | Android 9.0 (Pie); MIUI 10 |
| Processor | 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 | Octa-core (4x2.0 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) |
| Chipset | Exynos 2100 (5 nm) - International Qualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China | Qualcomm SDM665 Snapdragon 665 (11 nm) |
| GPU | Mali-G78 MP14 - International Adreno 660 - USA/China | Adreno 610 |
| Internal memory | 128GB 12GB RAM, 256GB 12GB RAM, 512GB 12GB RAM, 512GB 16GB RAM | 32GB 3GB RAM, 64GB 4GB RAM, 64GB 6GB RAM, 128GB 4GB RAM, 128GB 6GB RAM |
| External memory | No | microSD, up to 256 GB (dedicated slot) |
| Display | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| Type | Dynamic AMOLED 2X, 120Hz, HDR10 , 1500 nits (peak) | IPS LCD |
| Size | 6.8 inches, 112.1 cm2 | 6.3" inc |
| Resolution | 1440 x 3200 pixels, 20:9 ratio | 1080 x 2340 px |
| Protection | Corning Gorilla Glass Victus | Corning Gorilla Glass 5 |
| Touchscreen | capacitive touchscreen | |
| Screen-to-Body Ratio | 81.7% | |
| Display area | 97.4 cm2 | |
| Display aspect ratio | 19.5:9 (height:width) | |
| Pixel Density | 409 PPI | |
| Colors | 16M | |
| Main Camera | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| Features | LED flash, auto-HDR, panorama | |
| Video | 8K@24fps, 4K@30/60fps, 1080p@30/60/240fps, 720p@960fps, HDR10 , stereo sound rec., gyro-EIS | |
| Selfie camera | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| Camera | 40 MP, f/2.2, 26mm (wide), 1/2.8", 0.7µm, PDAF | |
| Features | Dual video call, Auto-HDR | |
| Video | 4K@30/60fps, 1080p@30fps | |
| Connectivity | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (Dual SIM model only) | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 | HSDPA 850 / 900 / 2100 |
| 4G Network | 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 38, 39, 40, 41, 46, 48, 66, 71 - SM-G998U1 | LTE band 1(2100), 3(1800), 5(850), 8(900), 38(2600), 40(2300), 41(2500) |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| Network | GSM / HSPA / LTE | |
| 5G Network | 2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G998U1 | |
| SIM card | Dual SIM (Nano-SIM, dual stand-by) | |
| Bluetooth | 5.2, A2DP, LE | 4.2, A2DP, LE |
| CDMA | CDMA 800 / 1900 & TD-SCDMA | |
| Edge | Yes | |
| GPRS | Yes | |
| GPS | Yes, with A-GPS, GLONASS, BDS, GALILEO | Yes, with A-GPS, GLONASS, BDS |
| NFC | Yes | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (CA), 5G | HSPA 42.2/11.5 Mbps, LTE-A |
| USB | USB Type-C 3.2, USB On-The-Go | 2.0, Type-C 1.0 reversible connector, USB On-The-Go |
| Technology | GSM / CDMA / HSPA / EVDO / LTE / 5G | |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct, hotspot | |
| Camera | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| Main camera | 48 MP, Quad | |
| Specs | 48 MP, f/1.8, 26mm (wide), 1/2", 0.8µm, PDAF -8 MP, f/2.2, 13mm (ultrawide), 1/4", 1.12µm -2 MP, f/2.4, 1/5", 1.75µm (dedicated macro camera) -2 MP, f/2.4, 1/5", 1.75µm, depth sensor | |
| Features | LED flash, HDR, panorama | |
| Video | 2160p@30fps, 1080p@30/60/120fps, gyro-EIS | |
| Selfie camera | 13 MP, Single | |
| Multimedia | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| Loudspeaker | Yes, with stereo speakers | |
| Multimedia | 32-bit/384kHz audio Tuned by AKG | |
| 3.5 mm Jack | No | Yes |
| Radio | FM radio (Snapdragon model only; market/operator dependent) | FM radio |
| Design | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| Body | IP68 dust/water resistant (up to 1.5m for 30 mins) Stylus support | |
| Colors | Phantom Black, Phantom Silver, Phantom Titanium, Phantom Navy, Phantom Brown, Navy | Neptune Blue, Moonlight White, Space Black |
| Body build | Glass front (Gorilla Glass Victus), glass back (Gorilla Glass Victus), aluminum frame | Front/back glass (Gorilla Glass 5) |
| Dimensions | 165.1 x 75.6 x 8.9 mm (6.5 x 2.98 x 0.35 in) | 158.3 x 75.3 x 8.4 mm |
| Weight | 227 g (Sub6), 229 g (mmWave) (8.01 oz) | 190 g |
| SIM | Single SIM (Nano-SIM and/or eSIM) or Dual SIM (Nano-SIM and/or eSIM, dual stand-by) | |
| Battery | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| Type | Li-Ion 5000 mAh, non-removable | |
| Charging | Fast charging 25W USB Power Delivery 3.0 Fast Qi/PMA wireless charging 15W Reverse wireless charging 4.5W | |
| Battery capacity | 4000 mAh, Non-removable Li-Po | |
| Features | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| Sensors | Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer | |
| Other | Samsung Galaxy S21 Ultra 5G | Xiaomi Redmi Note 8 |
| SAR | SAR - 0.26 W/kg (head) 1.00 W/kg (body) SAR EU - 0.26 W/kg (head) 1.00 W/kg (body) | |
| Release date | 2019, August | |
| Sensors | Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass , Infrared port |
