Home Phone comparison Vivo iQOO 15 Ultra and Vivo X300 Ultra - Which is better?

Vivo iQOO 15 Ultra vs Vivo X300 Ultra

94 out 100
Vivo iQOO 15 Ultra
VS
94 out 100
Vivo X300 Ultra
Vivo iQOO 15 Ultra
Vivo X300 Ultra

Compared 2 smartphones : Vivo iQOO 15 Ultra Manufactured in February, 2026, with display 6.85 with chipsetQualcomm Snapdragon 8 Elite Gen 5, vs Vivo X300 Ultra, Manufactured in April, 2026with chipsetQualcomm Snapdragon 8 Elite Gen 5. Below are specs, tests, pros and cons for each device

  1. Differences
  2. Review
  3. Specs
  4. Benchmarks
  5. Battery Life
  6. Cameras
  7. Comments (0)

Key Differences

Device key advantages
Reasons to choose Vivo iQOO 15 Ultra
  • Larger display: 6.85in
  • Lighter design: 227g vs 232g
  • Higher battery capacity: 7400mAh vs 6600mAh
  • Built-in eSIM
Reasons to choose Vivo X300 Ultra
  • Higher pixel density: 510ppi

Versions

Available versions and configurations
Memory Options - 16/256 GB
- 16/512 GB
- 16/1024 GB
- 24/1024 GB		 - 12/256 GB
- 12/512 GB
- 16/512 GB
- 16/1024 GB

Review

Key Specs Vivo iQOO 15 Ultra and Vivo X300 Ultra
Display
Color accuracy, sharpness & brightness
Camera
Main & front camera tests
Performance
App & system performance
Games
3D gaming performance
Battery
Battery life, charging speed & type
Connectivity
Connectivity features
NanoReview Score
Overall score by NanoReview
Adjust each parameter’s importance to find the best match for you.
Customize your score
Function
Importance (Weight)
Display:
Camera:
Performance:
Gaming:
Battery:
Connectivity:
Higher weight means greater impact on NanoReview score.

Tests & specs

Specs & test comparison
Smartphones:
Vivo iQOO 15 Ultra
vs
Vivo X300 Ultra

Display

Display quality comparison
Type AMOLED AMOLED
Size 6.85 in 6.82 in
Resolution 1440x3168 pixels 1440x3168 pixels
Aspect ratio 20:9 19.8:9
Pixel density 508 ppi 510 ppi
Refresh rate 144 Hz 144 Hz
Adaptive refresh rate Yes (1-120 Hz) Yes
Max brightness 2600 nits 1800 nits
HDR support Yes, HDR10+ Yes, Dolby Vision
Screen-to-body ratio 90.1 % 90.3 %
Features - DCI-P3
- Always-On Display
- DC dimming		 - DCI-P3
- Always-On Display
- DC dimming

Design & Build

Design and ergonomics comparison
Height 163.7 mm (6.44 in) 162.98 mm (6.42 in)
Width 76.8 mm (3.02 in) 76.81 mm (3.02 in)
Thickness 8.7 mm (0.34 in) 8.49 mm (0.33 in)
Weight 227 g (8.01 oz) 232 g (8.18 oz)
Water resistance IP69 IP69
Cooling system Active fan Vapor chamber
Back panel Glass Glass
Frame Metal Metal
Colors - Black
- Silver		 - Black
- Silver
- Green
Fingerprint sensor Yes, In-Display Yes, In-Display
Screen-to-body ratio
Vivo iQOO 15 Ultra
90.1 %
Vivo X300 Ultra
90.3 %

Performance

Testing Vivo iQOO 15 Ultra and Vivo X300 Ultra In benchmarks
Processor
Chipset Qualcomm Snapdragon 8 Elite Gen 5 Qualcomm Snapdragon 8 Elite Gen 5
Max Frequency 4600 MHz 4600 MHz
CPU Cores 8 (2 + 6) 8 (2 + 6)
Architecture - 6/3.63 (Oryon Gen 3 Performance)
- 2/4.61 (Oryon Gen 3 Prime)		 - 6/3.63 (Oryon Gen 3 Performance)
- 2/4.61 (Oryon Gen 3 Prime)
Process TSMC TSMC
Transistor Size 3 nm 3 nm
Neural Processor Hexagon Hexagon
Graphics Adreno 840 n/a
GPU Cores 1536 n/a
GPU Frequency 1200 MHz n/a
FLOPS 3686.4 GFLOPS n/a
GeekBench v6
Geekbench 6 (Single-Core)
Vivo iQOO 15 Ultra
3615
Vivo X300 Ultra
3621
Geekbench 6 (Multi-Core)
Vivo iQOO 15 Ultra
11366
Vivo X300 Ultra
10653
Geekbench 6 (Single-Core)36153621
Geekbench 6 (Multi-Core)1136610653
Sources: Geekbench v6 [Vivo iQOO 15 Ultra], [Vivo X300 Ultra]
AnTuTu 10
AnTuTu 10
Vivo iQOO 15 Ultra
4518403
Vivo X300 Ultra
4247433
CPU13220011192014
GPU15948481543938
Memory593523525105
UX1008031986376
NanoReview Score45184034247433

Memory

RAM
RAM Size 16 GB 12 GB
Memory Type LPDDR5X LPDDR5X
Memory Frequency n/a 5333 MHz
Channels 4 4
Storage
Storage Capacity256 GB256 GB
Storage TypeUFS 4.1UFS 4.1
Memory CardNoNo

Software

OS Android 16 Android 16
UI Skin OriginOS 6 OriginOS 6

Battery

Volume 7400 mAh 6600 mAh
Max Charging Power 100 W 100 W
Battery Type Silicon Carbon (Si/C) Silicon Carbon (Si/C)
Removable No No
Wireless Charging Yes (40 W) Yes (40 W)
Reverse Charging Yes, (Wireless) Yes
Fast Charging Yes Yes

Main camera

Matrix 50 MP 200 MP
Photo resolution 8192x6144 pixels n/a
Zoom Optical, 3x Optical, 3.7x
Flash Dual LED Dual LED
Stabilization Optical Optical
8K Recording Yes (Up to 30 fps) Yes (Up to 30 fps)
4K Recording Yes (Up to 60 fps) Yes (Up to 120 fps)
1080p Recording Yes (Up to 60 fps) Yes (Up to 60 fps)
Slow Motion 240 fps (1080p) 240 fps (1080p)
Wide-angle lens 107 ° 116 °
Lenses count Standard: 50 MP
Telephoto: 50 MP
Ultra-wide: 50 MP		 Standard: 200 MP
Telephoto: 200 MP
Ultra-wide: 50 MP
Features - Bokeh effect
- Pro mode
- RAW support		 - Bokeh effect
- Pro mode
- RAW support
Main lens
Matrix50 MP200 MP
Aperturef/1.9f/1.9
Focal length23 mm35 mm
SensorSony IMX921Sony LYT-901
Sensor size1/1.56 (0.64)1/1.12 (0.89)
Pixel size1 μm0.7 μm
AutofocusPhase autofocusLaser autofocus
StabilizationOpticalOptical
Telephoto
Matrix50 MP200 MP
Aperturef/2.7f/2.7
Focal lengthn/a85 mm
SensorSony IMX882Samsung ISOCELL HPB
Sensor size1/1.95 (0.51)1/1.4 (0.71)
Pixel size0.8 μm0.56 μm
StabilizationOpticalOptical
Ultra-wide lens
Matrix50 MP50 MP
Aperturef/2.1f/2.0
Focal length15 mm14 mm
Sensorn/aSony LYT-818
Sensor size1/2.76 (0.36)1/1.28 (0.78)
Pixel size0.64 μm1.22 μm
StabilizationDigitalOptical

Front camera

Matrix 32 MP 50 MP
Photo resolution n/a 8192x6144 pixels
Aperture f/2.2 f/2.5
Focal length 21 mm 24 mm
Sensor CMOS Samsung ISOCELL JN1
Sensor size 1/3.1 (0.32) 1/2.76 (0.36)
Pixel size 0.7 μm 0.64 μm
Autofocus No Phase autofocus
Stabilization Digital Digital
Video resolution 2160p (4K) at 60 fps 2160p (4K) at 60 fps
TOF 3D sensor No No

Connectivity

Wi-Fi version Wi-Fi 7 (802.11 a/b/g/n/ac/ax/be) Wi-Fi 7 (802.11 a/b/g/n/ac/ax/be)
Wi-Fi features - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display		 - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5.4 5.4
Bluetooth features LE LE
USB type USB Type-C USB Type-C
USB version 3.2 3.2
USB features - Charging
- USB Storage Mode
- OTG		 - Charging
- USB Storage Mode
- OTG
DisplayPort Yes Yes
GPS - GPS
- GLONASS
- Beidou
- Galileo
- QZSS		 - GPS
- GLONASS
- Beidou
- Galileo
- QZSS
NFC* Yes Yes
Infrared Port Yes Yes
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *YesNo
Hybrid SlotNoNo
5G SupportYesYes

Sound

3.5 mm Jack No No
FM Radio No No
Dolby Atmos Yes Yes

Other

Class Flagship Flagship
Announced February, 2026 yr March, 2026 yr
Release Date February, 2026 yr April, 2026 yr
MSRP ($) 820 1199
Sensors - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
Charger Included Yes, 100 W Yes, 80 W
* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

No clear favorite identified yet; updates may follow as new data arrives.

Survey

Which smartphone would you pick?
10 (76.92%)
3 (23.08%)
Total Votes: 13

User comments

Share your opinion or ask questions below