OnePlus 9 vs Xiaomi Poco C40 - Detailed Phone Comparison

Detailed Comparison

Specification
OnePlus 9
OnePlus 9
Oneplus

General

Launch Date March 26, 2021 June 17, 2022
Release Year 2021 2022

Physical

Volume 103.29 cm³ 119.52 cm³
Screen Size to Weight Ratio 3.41 "/g 3.29 "/g
Weight 192 g 204 g
Height 160 mm 169.6 mm
Width 74.2 mm 76.6 mm
Thickness 8.7 mm 9.2 mm
Foldable Design No No
Available Colors
  • Winter Mist
  • Arctic Sky
  • Astral Black
  • Coral Green
  • Poco Yellow
  • Power Black

Display

Screen Size 6.55 " 6.71 "
Resolution 1080 x 2400 720 x 1650
Aspect Ratio 20:9 21:9
Screen-to-Body Ratio 87.2 % 82 %
Pixel Density 402 PPI 268 PPI
Refresh Rate 120 Hz N/A
Typical Brightness N/A 400 nits
HBM Brightness N/A N/A
Peak Brightness 1100 nits N/A

Hardware

Battery Capacity per Screen Area 104.89 mAh/in² 133.26 mAh/in²
Battery Density 43.57 mAh/cm³ 50.2 mAh/cm³
Battery Capacity 4500 mAh 6000 mAh
NFC Support Yes Yes
Chipset Qualcomm SM8350 Snapdragon 888 5G (5 nm) JLQ JR510 (11 nm)
CPU Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) Octa-core (4x2.0 GHz Cortex-A55 & 4x1.5 GHz Cortex-A55)
GPU Adreno 660 Mali-G57 MC1

Connectivity

USB Version 3.1 2.0
OTG Support 1
DisplayPort
DisplayPort Version N/A N/A
USB Features USB Type-C 3.1, OTG USB Type-C 2.0

Software

Operating System Android Android
Initial OS Version 11 11
Maximum OS Version 13

Comparison Summary

1. Specifications Comparison

FeatureOnePlus 9Xiaomi Poco C40Practical Impact
Design
Dimensions160 × 74.2 × 8.7 mm169.6 × 76.6 × 9.2 mmPoco C40 is larger and thicker, potentially less comfortable for small hands and pockets.
Weight192g204gOnePlus 9 is lighter, making it slightly more comfortable for prolonged use.
Display
Size6.55"6.71"Poco C40 has a slightly larger screen, potentially better for media consumption.
Resolution1080x2400720x1650OnePlus 9 has a significantly sharper display, making text and images look clearer.
Pixel Density402 PPI268 PPIOnePlus 9's higher PPI means noticeably crisper visuals.
TechnologyAMOLEDIPS LCDOnePlus 9 offers superior contrast, deeper blacks and more vibrant colors compared to Poco C40's LCD screen.
Refresh Rate120Hz60HzOnePlus 9's smoother display will result in more fluid animations and gaming.
Brightness1100 nits0 nitsOnePlus 9 has significantly better outdoor visibility, particularly in bright sunlight. Poco C40 has no brightness specification provided.
Performance
ChipsetQualcomm SM8350 Snapdragon 888 5G (5 nm)JLQ JR510 (11 nm)OnePlus 9 has a much more powerful processor leading to faster app loading and smoother multitasking.
AnTuTu Score880,900128,944OnePlus 9 offers vastly superior performance for gaming, heavy apps, and general responsiveness.
GPUAdreno 660Mali-G57 MC1OnePlus 9 offers significantly better graphics performance.
Camera
Rear Standard48MP, f/1.7913MP, f/1.8OnePlus 9 captures significantly more detailed images, especially in low light conditions.
Selfie16MP, f/2.45MP, f/2.2OnePlus 9 takes much higher quality selfies, although the Poco C40 has a slightly wider aperture.
Wide Angle50MP, f/2.2N/AOnePlus 9 allows for high-quality wide-angle shots, a feature missing on the Poco C40.
Portrait ModeN/A2MP, f/2.4Poco C40 can capture portrait mode with a depth sensor.
Black & White2MP, f/2.4N/AOnePlus 9 has a dedicated monochrome sensor for unique photo effects.
Video RecordingUp to 8K@30fps1080p@30fpsOnePlus 9 records much higher resolution videos, suitable for professional videography.
Battery
Capacity4500mAh6000mAhPoco C40 has a larger battery capacity, potentially resulting in longer battery life.
Charging65W Fast Charging18W Fast ChargingOnePlus 9 charges significantly faster, reducing downtime.
Features15W Wireless ChargingReverse Charging, 10W Charger in BoxOnePlus 9 provides wireless charging, while Poco C40 can charge other devices.
Software
OSAndroid 11 (upgradable to 13)Android 11OnePlus 9 will have support for android 13.
Connectivity
Wi-FiWi-Fi 6Wi-Fi 5OnePlus 9 supports faster and more efficient Wi-Fi connections.
Bluetooth5.25.0OnePlus 9 has a newer Bluetooth version for better connection stability and audio quality.
GPSMore systemsFewer systemsOnePlus 9 provides more accurate location tracking due to support for more satellite systems.
Storage
Internal128GB or 256GB32GB or 64GBOnePlus 9 has significantly more storage for apps, photos, and videos.
RAM8GB or 12GB3GB or 4GBOnePlus 9 offers much better multitasking performance.
ExpandableNoNoNeither phone allows for expandable storage.
Audio
QualityDolby Atmos, Stereo speakers, Noise cancelling micBasic Audio FeaturesOnePlus 9 provides an immersive audio experience
Security
SensorFingerprintRear-mounted fingerprint sensorBoth phones offer basic fingerprint security.
Build Quality
Screen ProtectionGorilla Glass 5Gorilla Glass 3OnePlus 9 has superior protection against scratches and cracks.
Sensors
SensorsFingerprint, Proximity, Accelerometer, Compass, GyroscopeFingerprint, Accelerometer, Ultrasonic proximity virtualOnePlus 9 offers more comprehensive sensor suite.

2. Key Differences Analysis

OnePlus 9 Advantages:

  • Superior Display: AMOLED, higher resolution, 120Hz refresh rate, and much higher brightness result in a vastly better viewing experience for all use cases.
  • Significantly Faster Performance: The Snapdragon 888 chipset offers much better performance for demanding tasks, gaming, and general responsiveness.
  • High Quality Cameras: Better image quality, a wide-angle lens, and 8K video recording make the OnePlus 9 more suitable for photography and videography enthusiasts.
  • Faster Charging: 65W fast charging significantly reduces the charging time, very useful for busy individuals.
  • Enhanced Connectivity: Newer Wi-Fi and Bluetooth standards provide faster and more stable connections, as well as a more comprehensive sensor suite.
  • Superior Audio: Dolby Atmos, Stereo speakers, and Noise cancelling mic improve audio quality.
  • More Storage and RAM: Provides a lot more space for apps, files, and makes the device run smoother for longer.

Xiaomi Poco C40 Advantages:

  • Larger Battery: The 6000mAh battery may result in longer battery life, which is good for users who prioritize that.
  • Reverse Charging: This feature is useful for charging other devices on the go.
  • 10W Charger Included: Convenient for users who don't have a charger.
  • Lower Cost: Likely to be much cheaper than the OnePlus 9, making it more accessible for budget-conscious users.

Significant Trade-offs:

  • OnePlus 9: Higher price, potentially shorter battery life (despite fast charging).
  • Xiaomi Poco C40: Significantly lower performance, inferior display, poor camera performance, and very slow charging.

3. User Profiles & Recommendations

OnePlus 9 Ideal User:

  • Power Users: Individuals who demand top-tier performance for gaming, video editing, and multitasking.
  • Photography Enthusiasts: Users who prioritize camera quality for capturing high-quality photos and videos.
  • Media Consumers: Those who value a superior display for enjoying movies, videos, and games.
  • Professionals: Users who need fast charging and excellent performance for demanding tasks, as well as good connection speeds.

Use Cases for OnePlus 9:

  • High-end mobile gaming
  • Professional photography and videography
  • Seamless multitasking between demanding apps
  • Media consumption with vibrant colors and smooth motion
  • Video conferencing with clarity
  • Fast paced work

Xiaomi Poco C40 Ideal User:

  • Budget-Conscious Users: Individuals who prioritize affordability and battery life over high-end features.
  • Basic Smartphone Users: Those who primarily use their phone for calling, texting, social media, and basic web browsing.
  • Users Needing Long Battery: Those who travel or dont have access to charging often.
  • First Smartphone Buyers: Those who want to try out a basic smartphone.

Use Cases for Xiaomi Poco C40:

  • Long periods of simple usage without charging
  • Basic social media use and web browsing
  • Simple photography and video for social media
  • As a secondary phone.
  • A beginners smartphone

Price-to-Value Ratio:

  • OnePlus 9: Offers a premium experience with cutting-edge features, justifying its higher price for users who value these aspects.
  • Xiaomi Poco C40: Provides a basic smartphone experience at a budget-friendly price. This has limited performance.

4. Decision Framework

Key Questions for Buyers:

  1. What is your budget? The price difference between these two phones is significant, this is the biggest factor to consider.
  2. How important is performance? If you are a gamer, heavy multitasker, or use demanding apps, the OnePlus 9 is the only option. If you only use basic apps, you may want to consider the Poco C40.
  3. How important is display and camera quality? For users who consume lots of media and take lots of photos, the OnePlus 9 will be a lot better.

Scenario-Based Recommendations:

  • Scenario 1: Demanding User - If you need a high-performance device for gaming, demanding apps, and want excellent camera capabilities, choose the OnePlus 9.
  • Scenario 2: Budget Conscious User - If you are on a tight budget and need a basic device with long battery life for casual use, consider the Xiaomi Poco C40.
  • Scenario 3: Multimedia Lover - If you are looking for a phone with great display quality and good sound capabilities, pick the OnePlus 9.

What I Would Choose and Why

Given my background in smartphone analysis and considering the practical implications of the specs, I would choose the OnePlus 9. While the Xiaomi Poco C40 has a larger battery, the drastic differences in display quality, performance, and camera capabilities make the OnePlus 9 a far superior choice for a modern smartphone. The significantly higher performance of the Snapdragon 888 chipset ensures smooth operation, even with demanding tasks, while the AMOLED display and better camera are crucial for an enjoyable experience. The faster charging is also a major plus for its convenience. Ultimately, while it comes at a premium, the OnePlus 9 offers a much more complete and satisfying user experience, outweighing the Poco C40’s advantage in battery size.

Emily Harper
Emily Harper

Technology Insights Specialist

Dedicated technology writer specializing in mobile device analysis and technology communication. Expert at translating complex smartphone features into clear, actionable insights for diverse audiences.

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  • Mobile technology analysis
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Bridging technical complexity with engaging, accessible narratives.