Oppo Reno6 5G vs Realme C51 - Detailed Phone Comparison

Detailed Comparison

Specification
Realme C51
Realme C51
Realme

General

Launch Date June 11, 2021 August 1, 2023
Release Year 2021 2023

Physical

Volume 85.92 cm³ 102.59 cm³
Screen Size to Weight Ratio 3.53 "/g 3.62 "/g
Weight 182 g 186 g
Height 156.8 mm 167.2 mm
Width 72.1 mm 76.7 mm
Thickness 7.6 mm 8 mm
Foldable Design No No
Available Colors
  • Blue
  • Aurora
  • Purple
  • Stellar Black
  • Mint Green
  • Carbon Black

Display

Screen Size 6.43 " 6.74 "
Resolution 1080 x 2400 720 x 1600
Aspect Ratio 20:9 20:9
Screen-to-Body Ratio 88.3 % 85.5 %
Pixel Density 409 PPI 260 PPI
Refresh Rate 90 Hz 90 Hz
Typical Brightness 430 nits N/A
HBM Brightness 600 nits N/A
Peak Brightness 750 nits 560 nits

Hardware

Battery Capacity per Screen Area 104.00 mAh/in² 110.07 mAh/in²
Battery Density 50.05 mAh/cm³ 48.74 mAh/cm³
Battery Capacity 4300 mAh 5000 mAh
NFC Support Yes Yes
Chipset Mediatek Dimensity 900 (6 nm) Unisoc Tiger T612 (12 nm)
CPU Octa-core (2x2.4 GHz Cortex-A78 & 6x2.0 GHz Cortex-A55) Octa-core (2x1.8 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55)
GPU Mali-G68 MC4 Mali-G57

Connectivity

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

Software

Operating System Android Android
Initial OS Version 11 13
Maximum OS Version 12

Comparison Summary

Oppo Reno6 5G vs. Realme C51: A Detailed Comparison

1. Specifications Breakdown

Design & Build Quality

FeatureOppo Reno6 5GRealme C51Real-World Implications
Dimensions156.8 × 72.1 × 7.6 mm167.2 × 76.7 × 8 mmReno6 5G is slimmer and easier to grip, while C51 is larger and bulkier.
Weight182g186gNearly identical weight—difference is negligible.
Screen ProtectionGorilla Glass 5UnknownReno6 5G has better drop and scratch resistance.

Key Takeaway:

  • The Reno6 5G is more pocket-friendly with a sleeker profile.
  • Realme C51’s build is more budget-oriented with no confirmed Gorilla Glass protection.

Display Quality

FeatureOppo Reno6 5GRealme C51Real-World Implications
Size6.43" AMOLED6.74" IPS LCDC51 has a bigger screen, but Reno6 5G’s AMOLED offers deeper blacks and better contrast.
Resolution1080x2400 (409 PPI)720x1600 (260 PPI)Reno6 5G has sharper text and smoother visuals—better for media consumption.
Brightness1100 nits (peak)No data (likely dimmer)Reno6 5G is far more visible in sunlight.
Refresh Rate90Hz90HzBoth offer smooth scrolling, but AMOLED makes Reno6 5G’s 90Hz feel more fluid.

Key Takeaway:

  • Reno6 5G wins in display quality—better colors, sharpness, and outdoor visibility.
  • C51 compromises with a lower-resolution LCD but offers a larger screen for basic use.

Performance & Hardware

FeatureOppo Reno6 5GRealme C51Real-World Implications
ChipsetDimensity 900 (6nm)Unisoc T612 (12nm)Reno6 5G’s chip is faster and more efficient—better for gaming and multitasking.
AnTuTu Score815,200220,000Reno6 5G is 3.7x faster—much better for demanding apps and future-proofing.
RAM Options8GB / 12GB4GB / 6GBReno6 5G has more RAM, ideal for heavy multitaskers.
Storage128GB / 256GB64GB / 128GB / 256GBC51 offers an entry-level 64GB option, while Reno6 5G starts at 128GB.

Key Takeaway:

  • Reno6 5G is a performance beast—great for gamers and power users.
  • C51 is a budget performer—fine for basic tasks but struggles with heavy apps.

Camera System

FeatureOppo Reno6 5GRealme C51Real-World Implications
Main Camera50MP (1/1.56")50MP (1/2.76")Reno6 5G has a larger sensor, meaning better low-light performance.
Ultrawide Lens16MP (f/2.2)NoneReno6 5G offers more versatility for landscapes and group shots.
Telephoto Lens13MP (2x zoom)NoneReno6 5G has optical zoom, which C51 lacks.
Selfie Camera32MP (Sony IMX615)5MP (basic sensor)Reno6 5G’s selfies are far sharper and more detailed.
Video Recording4K@30fps, 1080p@60fps1080p@30fpsReno6 5G is better for vlogging with higher resolution and smoother footage.

Key Takeaway:

  • Reno6 5G has a flagship-grade camera setup—better in every way.
  • C51’s camera is basic—only suitable for casual snaps.

Battery & Charging

FeatureOppo Reno6 5GRealme C51Real-World Implications
Battery Capacity4500mAh5000mAhC51 has longer endurance, but Dimensity 900 is more power-efficient.
Charging Speed65W (super fast)33WReno6 5G charges in ~30 min vs. C51’s ~60 min.

Key Takeaway:

  • C51 lasts longer but Reno6 5G charges twice as fast.

2. Key Insights & Trade-offs

Oppo Reno6 5G Strengths:

Superior Performance – 3.7x faster than C51.
Best Display – AMOLED + 1080p + 1100 nits brightness.
Flagship-Grade Cameras – 4K video, ultrawide, telephoto.
Premium Build – Gorilla Glass 5, slimmer design.

Realme C51 Strengths:

Bigger Battery – 5000mAh = longer endurance.
Larger Screen – 6.74" for media consumption.
Newer OS – Ships with Android 13 (vs. Reno6 5G’s Android 11).

Trade-offs:

  • C51 sacrifices performance, camera quality, and display sharpness for battery life.
  • Reno6 5G has weaker battery life but compensates with ultra-fast charging.

3. User Profiles & Recommendations

Who Should Buy the Oppo Reno6 5G?

Power users – Gamers, multitaskers, and app-heavy users.
Photography lovers – Better cameras, 4K video, and zoom capabilities.
Media enthusiasts – AMOLED display makes videos and games look stunning.

Who Should Buy the Realme C51?

Budget-conscious users – Cheaper, larger battery for long use.
Casual users – Basic apps, calls, and social media.
Big-screen lovers – 6.74" display for reading and videos.


4. Buying Decision Framework

Ask Yourself:

  1. Do you care about performance and camera quality?Reno6 5G.
  2. Do you need a big battery and don’t mind weaker specs?C51.
  3. Do you prefer a premium-feeling device?Reno6 5G.

Scenario-Based Recommendations:

  • Best for Gaming & Photography?Reno6 5G.
  • Best Budget Daily Driver?Realme C51.
  • Best All-Rounder?Reno6 5G (if budget allows).

Final Verdict: What I’d Choose

Winner: Oppo Reno6 5G 🏆

Why?

  • Performance is night and day—Dimensity 900 vs. Unisoc T612 is a huge gap.
  • AMOLED display looks significantly better.
  • Camera versatility (ultrawide, telephoto, 4K video) makes it far more capable.
  • 65W charging means battery life is less of an issue.

Realme C51 is good if you only need a basic phone with long battery life, but Reno6 5G is the better investment if you want speed, camera quality, and display sharpness.

My Pick? Oppo Reno6 5G—it’s simply the better phone in every way except battery size.

Alex Griffin
Alex Griffin

Technology analyst specializing in mobile devices and consumer electronics.

Core Expertise

  • Mobile technology analysis
  • Consumer electronics evaluation
  • Technical specification interpretation
  • User experience insights

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