📱 Model features |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| Model | Galaxy S21 Ultra (SM-G998B/DS 256GB) | Poco F4 GT (256GB) |
| Other model names | Galaxy S21 Ultra 5G (SM-G998B/Dual-SIM) | POCO F4 GT 21121210G (12GB RAM) |
| Country or region available | 
(Global, International) |
(Global, International) |
| Brand | Samsung | Xiaomi |
| Release date | 1/29/2021, Announced: 1/14/2021 | 4/27/2022, Announced: 4/26/2022 |
| Depth | 8.9 millimeters (0.35 inches) | 8.5 millimeters (0.33 inches) |
| Size (width x height) | 75.6 x 165.1 millimeters (2.98 x 6.5 in) | 76.7 x 162.5 millimeters (3.02 x 6.4 in) |
| Weight | 227 grams (7.95 ounces) | 210 grams (7.35 ounces) |
| Build, materials | Aluminum frame, glass front/back | Aluminum frame, glass front/back |
| Protection against water and others | IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant | Not supported |
🤖 Operating System |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| System version | Android 11 | Android 12 |
| Firmware update | Android 13 | feature not registered |
| User Interface | One UI 3.1 / 4.1 / 5.0 | MIUI 13 |
⚙️ Processor |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| Chipset | 64bit: Samsung Exynos 2100 (5nm) | 64bit: Qualcomm Snapdragon 8 Gen 1 (SM8450) (4nm) |
| CPU | Octa-core, 3 processors:
1x 2.9GHz ARM Cortex-X1 (Single-core)
3x 2.8GHz ARM Cortex-A78 (Triple-core)
4x 2.2GHz ARM Cortex-A55 (Quad-core) | Octa-core, 3 processors:
1x 3GHz ARM Cortex-X2 (Single-core)
3x 2.5GHz ARM Cortex-A710 (Triple-core)
4x 1.79GHz ARM Cortex-A510 (Quad-core) |
| GPU graphical controller | ARM Mali-G78 MP14 (854MHz) | Qualcomm Adreno 730 (818MHz) |
| Performance (benchmark) | AnTuTu: 657150 (v8), 727634 (v9)
Geekbench: 3457 (v5.2)
GFXBench: 51fps (ES 3.1 onscreen) | AnTuTu: 952124 (v9)
Geekbench: 3637 (v5.4) |
💽 Memory and storage |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| RAM memory | 12GB LPDDR5 | 12GB LPDDR5 |
| Internal storage | 256GB (220GB available)
UFS 3.1 | 256GB (218GB available)
UFS 3.1 |
| External storage | Not supported | Not supported |
📲 Display |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| Display type | Dynamic AMOLED | AMOLED |
| Screen size | 6.8" inches | 6.67" inches |
| Screen-to-body ratio | ~89.4% (screen-to-body ratio) | ~86.2% (screen-to-body ratio) |
| Display resolution | 1440x3200 pixels (20:9) | 1080x2400 pixels (20:9) |
| Touchscreen | Capacitive Multitouch 10-points | Capacitive Multitouch |
| Pixel density (dot pitch) | 516 PPI | 395 PPI |
| Colors | 16 million | 1 billion |
| Scratch-resistant glass | Gorilla Glass Victus | Gorilla Glass Victus |
| Refresh rate | 120Hz | 120Hz |
| Display features | 1500nits[peak]
HDR10+
Always-On Display | 800nits[typ]
HDR10+
DCI-P3 |
📶 Mobile networks |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| Dual-SIM | Dual-SIM Standby - Call active on one sim card | Dual-SIM Standby - Call active on one sim card |
| SIM card | 2 slots (Dual-SIM)
nano-SIM (4FF) + e-SIM | 2 slots (Dual-SIM)
nano-SIM (4FF) |
| Maximum Download / Upload | 5000/1920 Mbps | 2000/1024 Mbps |
| Network technology | 2G, 3G, 4G, 5G | 2G, 3G, 4G, 5G |
| Frequency, bands | Expand band detailsCollapse details |
| GSM MHz band | Quad-Band 850/900/1800/1900 | Quad-Band 850/900/1800/1900 |
| Primary 2G network | GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
| Primary 3G network | UMTS 850/900/1700/1900/2100 | UMTS 800/850/900/1700/1900/2100 |
| Primary 4G network | LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 66)
TD-LTE (38, 39, 40, 41)
VoLTE | LTE Cat16 (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28)
TD-LTE (38, 40, 41)
VoLTE |
| Primary 5G network | SA/NSA/Sub6 (1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78) | SA/NSA/Sub6 (1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 77, 78) |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA |
| Secondary 2G network | GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
| Secondary 3G network | UMTS 850/900/1700/1900/2100 | UMTS 800/850/900/1700/1900/2100 |
| Secondary 4G network | LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 66)
TD-LTE (38, 39, 40, 41)
VoLTE | LTE Cat16 (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28)
TD-LTE (38, 40, 41)
VoLTE |
| Secondary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA |
📷 Camera |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| Back camera (main camera) | (quad camera)
108 megapixels
10MP periscope telephotof/4.9240mm1/3.24"1.22µmPDAFOIS10x-optical-zoom
10MP telephotof/2.470mm1/3.24"1.22µmPDAFOIS3x-optical-zoom
12MP ultrawidef/2.213mm1/2.55"1.4µmPDAFSuper-Steady-video | (triple camera)
64 megapixels
8MP ultrawidef/2.2120°
2MP macrof/2.4 |
| Main camera resolution | 12000x9000 pixels | 10120x6328 pixels |
| Video recording (primary) | 8K UHD (7680x4320) 24 fps | 4K UHD (3840x2160) 60 fps |
| Flash | LED flash | Dual-LED flash |
| Focal aperture | f/1.8 (aperture) | f/1.9 (aperture) |
| Focal length | 26mm lens | 26mm lens |
| Sensor size | 1/1.33" inches | 1/1.73" inches |
| Pixel size | 1.8µm pixel | 0.8µm pixel |
| Autofocus | PDAF: phase detection autofocus on both cameras | PDAF: phase detection autofocus |
| Touch focus | Supported | Supported |
| Image stabilization | OIS: Optical stabilization | EIS: Digital stabilization |
| Zoom | Digital and optical zoom | Only digital zoom |
| Face/smile detection | Face detection, Smile detection | Face detection, Smile detection |
| BSI sensor | Supported | Supported |
| HDR | HDR photo/video on both cameras | HDR photo/video on both cameras |
| Camera extras | 4K@60fps
1080p@240fps
720p@960fps | 1080p@120fps
720p@960fps |
📸 Front camera |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| Front camera (secondary) | 40 megapixels | 20 megapixels |
| Front camera resolution | 7296x5472 pixels | 5184x3840 pixels |
| Video recording (secondary) | 4K UHD (3840x2160) | Not supported |
| Front flash | Not supported | Not supported |
| Focal aperture | f/2.2 (aperture) | f/2.4 (aperture) |
| Focal length | 26mm lens | feature not registered |
| Sensor size | 1/2.8" inches | 1/2" inches |
| Pixel size | 0.7µm pixel | 0.8µm pixel |
🔉 Sound and multimedia |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| Loudspeaker | Stereo sound
32-bit/384kHz
Dolby Atmos
Tuned by AKG | Stereo sound with dual speakers
24-bit/192kHz
Dolby Atmos
Hi-Res Audio
Tuned by JBL |
| Active noise cancellation | 2 microphones or more | 2 microphones or more |
| Radio | FM | Not supported |
| TV | Not supported | Not supported |
| Video formats | MP4, H.265, H.264, H.263, XviD, MKV | MP4, H.265, H.264, H.263, XviD, MKV |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
🔌 Connectivity |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| USB | USB 3.2 Type-C, USB OTG On-The-Go | USB 2.0 Type-C, USB OTG On-The-Go |
| Audio output | Type-C reversible connector | Type-C reversible connector |
| TV output | USB Type-C (reversible) | USB Type-C (reversible) |
| Bluetooth | 5.2 + A2DP/LE | 5.2 + A2DP/LE |
| WiFi | 802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO
WiFi Direct, hotspot | 802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO
WiFi Direct, hotspot |
| DLNA | Supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou, QZSS, NavIC |
| NFC | Supported | Supported |
| Infrared port | Not supported | Supported |
🧭 Sensors |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| Sensors | Accelerometer
Ambient Light sensor
Barometer
Compass
Face unlock
Fingerprint sensor (under display)
Gesture
Gyroscope
Hall effect
Proximity sensor
UWB (Ultra Wide Band) | Accelerometer
Ambient Light sensor
Compass
Face unlock
Fingerprint sensor (side-mounted)
Gyroscope
Virtual proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| Battery type | LiPo: Li-Ion polymer (Non removable) | LiPo: Li-Ion polymer (Non removable) |
| Battery capacity | 5000 mAh | 4700 mAh |
| Charger, watts | 25W Wired fast charging
USB Power Delivery 3.0 | 120W Wired fast charging
Reverse charging by cable
Quick Charge 3+
USB Power Delivery 3.0 |
| Wireless charging | 15W Qi wireless charging (Qi/PMA)
4.5W Reverse wireless charging | Not supported |
| Talk time autonomy | feature not registered | feature not registered |
| Standby | feature not registered | feature not registered |
➕ Other features |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| Call control | Voice dialing, Voice recorder, Voice commands | Voice dialing, Voice recorder, Voice commands |
| Messaging | SMS (T9), MMS, E-mail, Push mail | SMS (T9), MMS, E-mail, Push mail |
| Hands-free calling | Supported | Supported |
| Video calling | Supported | Supported |
| Ringtones | Polyphonic and customized | Polyphonic and customized |
| Web browser | HTML, XHTML, HTML5 | HTML, XHTML, HTML5 |
| Antenna | Internal antenna | Internal antenna |
| Qwerty physical keyboard | Not supported | Not supported |
| Miscellaneous | • Colors: Phantom Black, Silver, Titanium, Navy, Brown
• Samsung Pay (Visa, MasterCard)
• Samsung DeX
• Stylus pen support | • Colors: Stealth Black, Knight Silver, Cyber Yellow
• Physical magnetic pop-up gaming triggers
• LiquidCool Technology 3.0 |
☢️ Radiation rate |
| Samsung Galaxy S21 Ultra (SM-G998B/DS 256GB) | Xiaomi Poco F4 GT (256GB) |
| SAR 1.6W/kg (USA, Mexico, etc.) | 0.24W/kg (head), 0.72W/kg (body) | 1.09W/kg (head), 0.99W/kg (body) |
| SAR 2W/kg (Europe, UK, etc.) | 0.714W/kg (head), 1.58W/kg (body) | 0.59W/kg (head), 0.96W/kg (body) |