Product
Oppo Reno4 Z 5G
Oppo Reno4 Z 5G
Samsung Galaxy M55s
Samsung Galaxy M55s
Battery
Charging 18W wired 45W wired
Type Li-Po 4000 mAh 5000 mAh
Body
Dimensions 163.8 x 75.5 x 8.1 mm (6.45 x 2.97 x 0.32 in) 163.9 x 76.5 x 7.8 mm (6.45 x 3.01 x 0.31 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 184 g (6.49 oz) 180 g (6.35 oz)
Comms
Bluetooth 5.1, A2DP, LE, aptX HD 5.2, A2DP, LE
NFC Yes Yes
Positioning GPS, GLONASS, GALILEO, BDS, QZSS GPS, GALILEO, GLONASS, BDS, QZSS
Radio No No
USB USB Type-C 2.0, OTG USB Type-C 2.0, OTG
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
Display
Protection Corning Gorilla Glass 3+ -
Resolution 1080 x 2400 pixels, 20:9 ratio (~401 ppi density) 1080 x 2400 pixels, 20:9 ratio (~393 ppi density)
Size 6.57 inches, 104.2 cm2 (~84.3% screen-to-body ratio) 6.7 inches, 108.4 cm2 (~86.4% screen-to-body ratio)
Type IPS LCD, 120Hz, 480 nits (typ) Super AMOLED+, 120Hz, 1000 nits (HBM)
Features
Sensors Fingerprint (side-mounted), accelerometer, gyro, proximity, compass Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Launch
Announced 2020, September 29 2024, September 24
Status Available. Released 2020, October 15 Available. Released 2024, September 26
Main Camera
Features LED flash, HDR, panorama LED flash, panorama, HDR
Quad 48 MP, f/1.7, 26mm (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.2, 119˚ (ultrawide), 1/4.0", 1.12µm 2 MP, f/2.4, (depth) 2 MP, f/2.4, (depth) -
Triple - 50 MP, f/1.8, (wide), 1/1.56", 1.0µm, PDAF, OIS 8 MP, f/2.2, 123˚ (ultrawide) 2 MP, f/2.4, (macro)
Video 4K@30fps, 1080p@30fps, gyro-EIS 4K@30fps, 1080p@30/60fps, gyro-EIS, OIS
Memory
Card slot No microSDXC (uses shared SIM slot)
Internal 128GB 8GB RAM, 256GB 12GB RAM 128GB 8GB RAM, 256GB 8GB RAM
  UFS 2.1 -
Misc
Colors Ink Black, Dew White Thunder Black, Coral Green
Models CPH2065 SM-M558B, SM-M558B/DS
SAR - 0.93 W/kg (head)    
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 38, 39, 40, 41, 66 1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 25, 26, 28, 38, 40, 41, 66
5G bands 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 77, 78 SA/NSA 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78 SA/NSA/Sub6
Speed HSPA, LTE, 5G 3.5 Gbps DL HSPA, LTE, 5G
Technology GSM / HSPA / LTE / 5G GSM / HSPA / LTE / 5G
Our Tests
Battery (old) Endurance rating 78h -
Camera Photo / Video -
Display 1284:1 contrast ratio, 398 nits max brightness (measured) -
Loudspeaker -28.1 LUFS (Average) -
Performance AnTuTu: 295562 (v8) GeekBench: 2196 (v5.1) GFXBench: 16fps (ES 3.1 onscreen) -
Platform
Chipset Mediatek Dimensity 800 (7 nm) Qualcomm SM7450-AB Snapdragon 7 Gen 1 (4 nm)
CPU Octa-core (4x2.0 GHz Cortex-A76 & 4x2.0 GHz Cortex-A55) Octa-core (1x2.4 GHz Cortex-A710 & 3x2.36 GHz Cortex-A710 & 4x1.8 GHz Cortex-A510)
GPU Mali-G57 MC4 Adreno 644
OS Android 10, upgradable to Android 11, ColorOS 11.1 Android 14, up to 4 major Android upgrades, One UI 6.1
Selfie camera
Dual 16 MP, f/2.0, 26mm (wide), 1/3.06", 1.0µm 2 MP, f/2.4, (depth) -
Features HDR -
Single - 50 MP, f/2.4, (wide)
Video 1080p@30fps 4K@30fps, 1080p@30/60fps
Sound
3.5mm jack Yes No
Loudspeaker Yes Yes, with stereo speakers
  24-bit/192kHz Hi-Res audio -