vivo X51 5G vs vivo iQOO Z6 44W

Network
2G network

GSM 850, 900, 1800, 1900; CDMA 800

GSM 850, 900, 1800, 1900
3G network

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

HSDPA 850, 900, 2100
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, 3, 5, 8, 38, 40, 41
5G network

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

-
HSDPA speed

42.2 Mbps

42.2 Mbps
HSUPA speed

5.76 Mbps

5.76 Mbps
EV-DO speed

-

EV-DO Rev.A 3.1 Mbps download, 1.8 Mbps upload
LTE speed

LTE-A

LTE-A, 391 Mbps download, 150 Mbps upload
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Glass front, glass back, aluminum frame

Glass front, plastic frame, plastic back
SIM

Dual SIM (Nano-SIM, dual stand-by)

Dual SIM (Nano-SIM, dual stand-by)
Height

158.5 mm

160.8 mm
Width

72.8 mm

73.8 mm
Thickness

8 mm

8.4 mm
Weight

181.5 g

182 g
Colors

Gray

Black, Blue

Hardware
CPU

Octa-core

Octa-core
CPU

Single-core 2.4 GHz Kryo 475 Prime

Quad-core 2.4 GHz Kryo 265 Gold
CPU(second)

Single-core 2.2 GHz Kryo 475 Gold

quad-core 1.9 GHz Kryo 265 Silver
CPU(third)

Hexa-core 1.8 GHz Kryo 475 Silver
Chipset

Qualcomm SM7250 Snapdragon 765G

Qualcomm SM6225 Snapdragon 680 4G
GPU

Adreno 620

Adreno 610
Memory RAM

8 GB

4, 6, 8 GB
Internal storage

256 GB

128 GB
Memory card

No

microSD, microSDHC, microSDXC
Storage

UFS 2.1

UFS 2.2

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 , 1/2.76" , 0.64 µm
(periscope telephoto) , 8 MP, f/3.4 , 135 mm, 1/4.0" , 5x optical zoom

(macro) , 2 MP, f/2.4
(portrait) , 13 MP, f/2.5 , 50 mm, 1/2.8" , 0.8 µm, 2x optical zoom

(depth) , 2 MP, f/2.4
(ultrawide) , 8 MP, f/2.2 , 120˚ , 16 mm, 1/4.0" , 1.12 µm
Primary camera resolution

8000 x 6000 pixels

-
Primary camera video

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

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

dual-LED dual-tone flash

LED 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 shooting, digital zoom, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, macro-mode, phase detection autofocus
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/2.0
Selfie camera resolution

6528 x 4896 pixels

-
Selfie camera features

Face unlock

-
Selfie camera video

1080p@30fps

1080p@30fps
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
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

v5.0
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

Yes
Bluetooth AptX

aptX HD

-
NFC

Yes

No
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

Yes

Yes
BDS

Yes

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

5000 mAh
Battery removable

Non-removable

Non-removable
Fast battery charging

Vivo FlashCharge (57% in 30 min)

Yes, 44W (50% in 27 min)
DxOMark autonomy

45

-
DxOMark charging

80

-
DxOMark efficiency

68

-
DxOMark battery score

60

-