Samsung Galaxy S21 Ultra (SM-G998U1 512GB) vs Xiaomi Poco X3 GT (256GB)
Side by side comparison between Samsung Galaxy S21 Ultra vs Xiaomi Poco X3 GT phones, differences, pros, cons and full specifications. What's the better?
,
6.8"
AMOLED
AMOLED
1440x3200
108
MP
MP
40mp
16GB
RAM
RAM
Octa-core
5000
mAh
mAh
(Non removable)
vs
6.6"
IPS
IPS
1080x2400
64
MP
MP
16mp
8GB
RAM
RAM
Octa-core
5000
mAh
mAh
(Non removable)
What's the better phone? Samsung Galaxy S21 Ultra (SM-G998U1 512GB)
The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!
27 Common items in both devices |
UFS 3.1 |
8.9 millimeters (0.35 inches) |
120Hz |
16 million |
LED flash |
PDAF: phase detection autofocus on both cameras / PDAF: phase detection autofocus |
HDR photo/video on both cameras / HDR photo on both cameras |
+20 specs and more in the table below |
Check the comparison table below for more items that are not evaluated in comparison score above.
Highlight differences Clear highlight📱 Model features | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
Model | Galaxy S21 Ultra (SM-G998U1 512GB) | Poco X3 GT (256GB) |
Other model names | Galaxy S21 Ultra 5G (SM-G998U1) Unlocked | POCO X3 GT (21061110AG) |
Country or region available | USA | (Global, International) |
Brand | Samsung | Xiaomi |
Release date | 1/29/2021, Announced: 1/14/2021 | 8/19/2021, Announced: 7/28/2021 |
Depth | 8.9 millimeters (0.35 inches) | 8.9 millimeters (0.35 inches) |
Size (width x height) | 75.6 x 165.1 millimeters (2.98 x 6.5 in) | 75.9 x 163.3 millimeters (2.99 x 6.43 in) |
Weight | 227 grams (7.95 ounces) | 193 grams (6.76 ounces) |
Build, materials | Aluminum frame, glass front/back | Plastic body, glass front |
Protection against water and others | IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant | IP53 certified: protection against dust and splashing |
📲 Display | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
Display type | Dynamic AMOLED | TFT IPS LCD |
Screen size | 6.8" inches | 6.6" inches |
Screen-to-body ratio | ~89.4% (screen-to-body ratio) | ~84.9% (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 | 399 PPI |
Colors | 16 million | 16 million |
Scratch-resistant glass | Gorilla Glass Victus | Gorilla Glass Victus |
Refresh rate | 120Hz | 120Hz |
Display features | 1500nits[peak] HDR10+ Always-On Display | 450nits[typ] HDR10 |
🤖 Operating System | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
System version | Android 11 | Android 11 |
Firmware update | Android 14 | Android 12 |
User Interface | One UI 3.1 / 4.1 / 5.1 / 6.0 | MIUI 12.5 / 13 |
⚙️ Processor | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
Chipset | 64bit: Qualcomm Snapdragon 888 (SM8350) (5nm) | 64bit: MediaTek Dimensity 1100 (MT6891Z) (6nm) |
CPU | Octa-core, 3 processors: 1x 2.84GHz Kryo 680 (Single-core) 3x 2.42GHz Kryo 680 (Triple-core) 4x 1.8GHz Kryo 680 (Quad-core) | Octa-core, 2 processors: 4x 2.6GHz ARM Cortex-A78 (Quad-core) 4x 2GHz ARM Cortex-A55 (Quad-core) |
GPU graphical controller | Qualcomm Adreno 660 (840MHz) | ARM Mali-G77 MC9 (836MHz) |
Performance (benchmark) | AnTuTu: 681099 (v8), 809165 (v9) Geekbench: 3539 (v5.2) GFXBench: 54fps (ES 3.1 onscreen) | AnTuTu: 506800 (v8), 578505 (v9) Geekbench: 2310 (v5.1) GFXBench: 38fps (ES 3.1 onscreen) |
💽 Memory and storage | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
RAM memory | 16GB LPDDR5 | 8GB LPDDR4X |
Internal storage | 512GB (457GB available) UFS 3.1 | 256GB (230GB available) UFS 3.1 |
External storage | Not supported | Not supported |
📶 Mobile networks | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
Dual-SIM | Dual-SIM Standby - Call active on one sim card | Dual-SIM Standby - Call active on one sim card |
SIM card | 1 slot (Single-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 details Collapse details | |
GSM MHz band | Quad-Band 850/900/1800/1900 | Quad-Band 850/900/1800/1900 |
Primary 2G network | CDMA 800/1900, GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
Primary 3G network | CDMA2000 1xEV-DO UMTS 850/900/1700/1900/2100 | UMTS 850/900/1700/1900/2100 |
Primary 4G network | LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 66, 71) TD-LTE (38, 39, 40, 41, 46, 48) VoLTE | LTE Cat6 (1, 2, 3, 4, 5, 7, 8, 18, 19, 26, 28) TD-LTE (38, 40, 41, 42) VoLTE |
Primary 5G network | SA/NSA/Sub6 (2, 5, 25, 41, 66, 71) mmWave (260, 261) | SA/NSA (1, 3, 28, 41, 77, 78) |
Primary data network | GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA, Sub6 | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA |
Secondary 2G network | CDMA 800/1900, GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
Secondary 3G network | CDMA2000 1xEV-DO UMTS 850/900/1700/1900/2100 | UMTS 850/900/1700/1900/2100 |
Secondary 4G network | LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 66, 71) TD-LTE (38, 39, 40, 41, 46, 48) VoLTE | LTE Cat6 (1, 2, 3, 4, 5, 7, 8, 18, 19, 26, 28) TD-LTE (38, 40, 41, 42) VoLTE |
Secondary data network | GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA, Sub6 | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A |
📷 Camera | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
Back camera (main camera) | (quad camera) 108 megapixels 10MP periscope telephoto f/4.9240mm1/3.24"1.22µmPDAFOIS10x-optical-zoom 10MP telephoto f/2.470mm1/3.24"1.22µmPDAFOIS3x-optical-zoom 12MP ultrawide f/2.213mm1/2.55"1.4µmPDAFSuper-Steady-video | (triple camera) 64 megapixels 8MP ultrawide f/2.2120°1/4"1.12µm 2MP macro f/2.4 |
Main camera resolution | 12000x9000 pixels | 10120x6328 pixels |
Video recording (primary) | 8K UHD (7680x4320) 24 fps | 4K UHD (3840x2160) 30 fps |
Flash | LED flash | LED flash |
Focal aperture | f/1.8 (aperture) | f/1.8 (aperture) |
Focal length | 26mm lens | 26mm lens |
Sensor size | 1/1.33" inches | 1/1.97" inches |
Pixel size | 1.8µm pixel | 0.7µm 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 on both cameras |
Camera extras | 4K@60fps 1080p@240fps 720p@960fps | feature not registered |
📸 Front camera | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
Front camera (secondary) | 40 megapixels | 16 megapixels |
Front camera resolution | 7296x5472 pixels | 4608x3456 pixels |
Video recording (secondary) | 4K UHD (3840x2160) | Full HD (1920x1080) |
Front flash | Not supported | Not supported |
Focal aperture | f/2.2 (aperture) | f/2.5 (aperture) |
Focal length | 26mm lens | feature not registered |
Sensor size | 1/2.8" inches | 1/3.06" inches |
Pixel size | 0.7µm pixel | 1µm pixel |
🔉 Sound and multimedia | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
Loudspeaker | Stereo sound 32-bit/384kHz Dolby Atmos Tuned by AKG | Stereo sound with dual speakers 24-bit/192kHz 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 | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 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 jack with 3.5mm jack adapter |
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 |
NFC | Supported | Supported |
Infrared port | Not supported | Supported |
🧭 Sensors | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
Sensors | Accelerometer Ambient light sensor Barometer Compass Face unlock Fingerprint sensor (under display) Gesture Gyroscope Hall effect Proximity sensor UWB (Ultra Wideband) | Accelerometer Ambient light sensor Compass Face unlock Fingerprint sensor (side-mounted) Gyroscope |
Vibrating alert | Supported | Supported |
🔋 Battery | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
Battery type | LiPo: li-ion polymer (Non removable) | LiPo: li-ion polymer (Non removable) |
Battery capacity | 5000 mAh | 5000 mAh |
Charger, watts | 25W Wired fast charging USB Power Delivery 3.0 | 67W Wired fast charging USB Power Delivery 3.0 |
Inductive / 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 | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 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: Black, Wave Blue, Cloud White • Protective case included |
☢️ Radiation rate | ||
Galaxy S21 Ultra (SM-G998U1 512GB) | Xiaomi Poco X3 GT (256GB) | |
SAR 1.6W/kg (USA, Mexico, etc.) | 0.77W/kg (head), 1.02W/kg (body) | feature not registered |
SAR 2W/kg (Europe, UK, etc.) | feature not registered | feature not registered |