vivo X51 5G vs vivo iQOO 9 (China)

Network
2G network

GSM 850, 900, 1800, 1900; CDMA 800

GSM 850, 900, 1800, 1900; CDMA 800
3G network

HSDPA 850, 900, 1700(AWS), 1900, 2100

HSDPA 850, 900, 1700(AWS), 1900, 2100; CDMA2000 1x
4G network

LTE frequency band 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 32, 38, 39, 40, 41, 66

LTE frequency band 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 34, 38, 39, 40, 41
5G network

5G band 1, 3, 7, 8, 28, 38, 41, 77, 78 SA/NSA

5G band 1, 3, 5, 8, 28, 41, 77, 78 SA/NSA
HSDPA speed

42.2 Mbps

42.2 Mbps
HSUPA speed

5.76 Mbps

5.76 Mbps
LTE speed

LTE-A

LTE-A
GPRS

Yes

Yes
EDGE

Yes

Yes

Hardware
CPU

Octa-core

Octa-core
CPU

Single-core 2.4 GHz Kryo 475 Prime

Single-core 3.0 GHz Cortex-X2
CPU(second)

Single-core 2.2 GHz Kryo 475 Gold

Triple-core 2.50 GHz Cortex-A710
CPU(third)

Hexa-core 1.8 GHz Kryo 475 Silver

Quad-core 1.80 GHz Cortex-A510
Chipset

Qualcomm SM7250 Snapdragon 765G

Qualcomm SM8450 Snapdragon 8 Gen1
GPU

Adreno 620

Adreno 730
Memory RAM

8 GB

8, 12 GB
Internal storage

256 GB

128, 256, 512 GB
Memory card

No

No
Storage

UFS 2.1

UFS 3.1

Main camera
Camera type

Quad

Triple
Main camera

(wide) , 48 MP, f/1.6 , 1/1.2" , 0.8 µm

(wide) , 50 MP, f/1.8 , 1/1.57" , 1.0 µm, 20x digital zoom
(periscope telephoto) , 8 MP, f/3.4 , 135 mm, 1/4.0" , 5x optical zoom

(telephoto) , 12 MP, f/2.0 , 47 mm, 2x optical zoom
(portrait) , 13 MP, f/2.5 , 50 mm, 1/2.8" , 0.8 µm, 2x optical zoom

(ultrawide) , 13 MP, f/2.2 , 16 mm, 120˚
(ultrawide) , 8 MP, f/2.2 , 120˚ , 16 mm, 1/4.0" , 1.12 µm
Primary camera resolution

8000 x 6000 pixels

8160 x 6144 pixels
Primary camera video

4K@30fps, 1080p@30fps, gyro-EIS

4K@30fps, 1080p@30fps, gyro-EIS
Primary camera flash

dual-LED dual-tone flash

dual-LED dual-tone flash
Camera features

Autofocus, continuous shooting, digital zoom, digital image stabilization, optical image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, macro-mode, phase detection autofocus

Autofocus, continuous autofocus, continuous shooting, digital zoom, optical zoom, digital image stabilization, optical image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, macro-mode, phase detection autofocus, night mode
DxOMark photo

117

-
DxOMark zoom

67

-
DxOMark video

102

-
DxOMark camera score

114

-

Selfie camera
Selfie camera type

Single

Single
Selfie camera

(wide) , 32 MP, f/2.5 , 26 mm, 1/2.8" , 0.8 µm

(wide) , 16 MP, f/2.5
Selfie camera resolution

6528 x 4896 pixels

-
Selfie camera features

Face unlock

HDR
Selfie camera video

1080p@30fps

1080p@30fps, gyro-EIS
DxOMark photo

82

-
DxOMark video

78

-
DxOMark camera score

81

-

Connectivity
WLAN

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5Ghz, 802.11ac

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5GHz, 802.11ac, 802.11ax
WLAN WiFi Hotspot

Yes

Yes
WLAN WiFi Direct

Yes

Yes
WLAN WiFi Dual Band

Yes

Yes
USB

Type-C 2.0

Type-C 2.0
USB On-The-Go

Yes

Yes
Bluetooth

v5.1

v5.2
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

Yes
Bluetooth AptX

aptX HD

aptX HD, aptX Adaptive
NFC

Yes

Yes
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

Yes

Yes
BDS

Yes

Yes
QZSS

-

Yes

Features
Sensors

Accelerometer, color spectrum, compass, fingerprint, gyroscope, proximity

Accelerometer, compass, fingerprint, gyroscope, proximity

Battery
Battery type

Li-Po

Li-Po
Battery capacity

4315 mAh

4700 mAh
Battery removable

Non-removable

Non-removable
Fast battery charging

Vivo FlashCharge (57% in 30 min)

Yes, 120W(100% in 19 min)
Wireless reverse charging

-

Yes, 10W
Talk time 4G

-

14.1 h
DxOMark autonomy

45

-
DxOMark charging

80

-
DxOMark efficiency

68

-
DxOMark battery score

60

-