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Xiaomi 12X
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Samsung Galaxy S21 5G

Xiaomi 12X
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Network
Technology GSM / CDMA / HSPA / EVDO / LTE / 5G GSM / CDMA / HSPA / EVDO / LTE / 5G
2G bands GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (Dual SIM model only) GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
  CDMA 800 / 1900 & TD-SCDMA CDMA 800
3G Network HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100
  CDMA2000 1xEV-DO CDMA2000 1xEV-DO
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-G991U1 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 26, 28, 32, 38, 39, 40, 41, 42, 48, 66 - International
  1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 66 - SM-G991B 1, 2, 3, 4, 5, 7, 8, 18, 19, 26, 34, 38, 39, 40, 41, 42 - China
5G Network 2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G991U1 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78 SA/NSA - International
  1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78 SA/NSA/Sub6 - SM-G991B 1, 3, 5, 8, 28, 38, 40, 41, 77, 78 SA/NSA - China
Speed HSPA 42.2/5.76 Mbps, LTE (7CA) Cat20 2000/200 Mbps, 5G (5+ Gbps DL) HSPA, LTE, 5G
Launch
Announced 2021, January 14 2021, December 28
Status Available. Released 2021, January 29 Available. Released 2021, December 31
Body
Dimensions 151.7 x 71.2 x 7.9 mm (5.97 x 2.80 x 0.31 in) 152.7 x 69.9 x 8.2 mm (6.01 x 2.75 x 0.32 in)
3D size compare
Weight 169 g (Sub6), 171 g (mmWave) (5.96 oz) 176 g (6.21 oz)
Build Glass front (Gorilla Glass Victus), plastic back, aluminum frame
SIM Nano-SIM and eSIM or Dual SIM (2 Nano-SIMs and eSIM, dual stand-by) Dual SIM (Nano-SIM, dual stand-by)
 IP68 dust/water resistant (up to 1.5m for 30 min)
Display
Type Dynamic AMOLED 2X, 120Hz, HDR10+, 1300 nits (peak) AMOLED, 68B colors, 120Hz, Dolby Vision, HDR10+, 1100 nits (peak)
Size 6.2 inches, 94.1 cm2 (~87.2% screen-to-body ratio) 6.28 inches, 95.2 cm2 (~89.2% screen-to-body ratio)
Resolution 1080 x 2400 pixels, 20:9 ratio (~421 ppi density) 1080 x 2400 pixels, 20:9 ratio (~419 ppi density)
Protection Corning Gorilla Glass Victus Corning Gorilla Glass Victus
 Always-on display
Platform
OS Android 11, upgradable to Android 14, One UI 6 Android 11, MIUI 13
Chipset Exynos 2100 (5 nm) - International
Qualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China		 Qualcomm SM8250-AC Snapdragon 870 5G (7 nm)
CPU Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - International
Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) - USA/China		 Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585)
GPU Mali-G78 MP14 - International
Adreno 660 - USA/China		 Adreno 650
Memory
Card slot No No
Internal 128GB 8GB RAM, 256GB 8GB RAM 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM
 UFS 3.1 UFS 3.1
Main Camera
Modules 12 MP, f/1.8, 26mm (wide), 1/1.76", 1.8µm, dual pixel PDAF, OIS
64 MP, f/2.0, 29mm (telephoto), 1/1.72", 0.8µm, PDAF, OIS, 1.1x optical zoom, 3x hybrid zoom
12 MP, f/2.2, 13mm, 120˚ (ultrawide), 1/2.55" 1.4µm, Super Steady video		 50 MP, f/1.9, 26mm (wide), 1/1.56", 1.0µm, PDAF, OIS
13 MP, f/2.4, 12mm, 123˚ (ultrawide), 1/3.06", 1.12µm
5 MP, f/2.4, 50mm (telephoto macro), AF
Features LED flash, auto-HDR, panorama Dual-LED dual-tone flash, HDR, panorama
Video 8K@24fps, 4K@30/60fps, 1080p@30/60/240fps, 720p@960fps, HDR10+, stereo sound rec., gyro-EIS 8K@24fps, 4K@30/60fps, 1080p@30/120/240/960fps, gyro-EIS
Selfie Camera
Modules 10 MP, f/2.2, 26mm (wide), 1/3.24", 1.22µm, dual pixel PDAF 32 MP, f/2.5, 26mm (wide), 0.7µm
Features Dual video call, Auto-HDR HDR, panorama
Video 4K@30/60fps, 1080p@30fps 1080p@30/60fps, 720p@120fps, HDR
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Sound
Loudspeaker Yes, with stereo speakers Yes, with stereo speakers
3.5mm jack No No
 32-bit/384kHz audio
Tuned by AKG		 24-bit/192kHz Hi-Res audio
Tuned by Harman Kardon
Comms
WLAN Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi 6 (market dependent), dual-band, Wi-Fi Direct
Bluetooth 5.0, A2DP, LE 5.1 / 5.2, A2DP, LE
Positioning GPS, GLONASS, BDS, GALILEO GPS (L1+L5), GLONASS (L1), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5)
NFC Yes Yes (market/region dependent)
Infrared port No Yes
Radio FM radio (Snapdragon model only; market/operator dependent) No
USB USB Type-C 3.2, OTG USB Type-C 2.0, OTG
Features
Sensors Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer Fingerprint (under display, optical), accelerometer, proximity, gyro, compass
 Samsung DeX, Samsung Wireless DeX (desktop experience support)
Battery
Type Li-Ion 4000 mAh, non-removable Li-Po 4500 mAh, non-removable
Charging 25W wired, PD3.0
15W wireless (Qi/PMA)
4.5W reverse wireless		 67W wired, PD3.0, QC4, 100% in 39 min (advertised)
Misc
Colors Phantom Gray, Phantom White, Phantom Violet, Phantom Pink Gray, Blue, Purple
SAR 0.74 W/kg (head)     1.08 W/kg (body)    
SAR EU 0.46 W/kg (head)     1.51 W/kg (body)     0.59 W/kg (head)     1.00 W/kg (body)    
Models SM-G991B, SM-G991B/DS, SM-G991U, SM-G991U1, SM-G991W, SM-G991N, SM-G9910, SM-G991Q, SCG09 2112123AC, 2112123AG
Price $ 188.50 / C$ 294.95 / £ 177.89 / € 268.92 $ 299.99 / € 218.12
Tests
Performance AnTuTu: 584055 (v8)
GeekBench: 3238 (v5.1)
GFXBench: 60fps (ES 3.1 onscreen)		 AnTuTu: 598003 (v8), 690298 (v9)
GeekBench: 3168 (v5.1)
GFXBench: 47fps (ES 3.1 onscreen)
Display Contrast ratio: Infinite (nominal) Contrast ratio: Infinite (nominal)
Camera Compare PHOTO / Compare VIDEO
Loudspeaker -26.4 LUFS (Good) -25.6 LUFS (Very good)
Battery (old) Endurance rating 93h Endurance rating 105h

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