Oppo A5x 5G
Realme C75x

Oppo A5x 5G Realme C75x

Overview

Welcome to our in-depth specs comparison between the Oppo A5x 5G and the Realme C75x — two budget-friendly Android 15 smartphones that take notably different approaches to what matters most. While they share the same display size, charging speed, and core connectivity features, key battlegrounds emerge around performance and chipset capability, water resistance ratings, storage and RAM configurations, and 5G connectivity. Read on to see how every spec stacks up.

Common Features

  • Both phones share the same thickness of 8 mm.
  • Both phones have the same width of 76.2 mm.
  • Both phones have the same height of 165.7 mm.
  • Neither phone has a rugged build.
  • Neither phone can be folded.
  • Both phones feature an LCD IPS display type.
  • Both phones have a screen size of 6.67″.
  • Both phones have a pixel density of 264 ppi.
  • Both phones have a resolution of 720 x 1604 px.
  • HDR10 support is not available on either phone.
  • HDR10+ support is not available on either phone.
  • Always-On Display is not available on either phone.
  • Dolby Vision support is not available on either phone.
  • Both phones run Android 15.
  • Both phones support fast charging at 45W.
  • Wireless charging is not available on either phone.
  • Neither phone has a removable battery.
  • Both phones have stereo speakers.
  • A 3.5 mm audio jack is not present on either phone.
  • Both phones support Wi-Fi 4 and Wi-Fi 5, have dual SIM slots, a USB Type-C port with USB 2.0, an external memory slot, and a fingerprint scanner.
  • NFC is not available on either phone.
  • Both phones have a single-lens main camera without optical image stabilization.
  • Both phones record main camera video at 1080p 30 fps.
  • Both phones have a 5 MP front camera.
  • Both phones use a CMOS sensor.
  • Both phones support 8-thread CPUs using big.LITTLE technology and DDR4 memory.
  • Both phones support 64-bit processing and have integrated LTE and graphics.
  • Both phones support DirectX 12.

Main Differences

  • Water resistance is rated IP65 on Oppo A5x 5G, while Realme C75x is rated IP68 and considered fully waterproof.
  • Weight is 193 g on Oppo A5x 5G and 196 g on Realme C75x.
  • Display refresh rate is 120Hz on Oppo A5x 5G and 90Hz on Realme C75x.
  • Damage-resistant glass is present on Oppo A5x 5G but not available on Realme C75x.
  • Internal storage is 128GB on Oppo A5x 5G and 256GB on Realme C75x.
  • RAM is 4GB on Oppo A5x 5G and 8GB on Realme C75x.
  • The chipset is MediaTek Dimensity 6300 on Oppo A5x 5G and MediaTek Helio G81 Ultra on Realme C75x.
  • The GPU is Arm Mali-G57 MC2 on Oppo A5x 5G and Mali G52 MP2 on Realme C75x.
  • CPU speed is 2 x 2.4 & 6 x 2 GHz on Oppo A5x 5G and 2 x 2 & 6 x 1.8 GHz on Realme C75x.
  • Geekbench 6 multi-core score is 2012 on Oppo A5x 5G and 1391 on Realme C75x.
  • Geekbench 6 single-core score is 782 on Oppo A5x 5G and 420 on Realme C75x.
  • RAM speed is 2133 MHz on Oppo A5x 5G and 1800 MHz on Realme C75x.
  • Semiconductor size is 6 nm on Oppo A5x 5G and 12 nm on Realme C75x.
  • Maximum memory bandwidth is 17.07 GB/s on Oppo A5x 5G and 13.41 GB/s on Realme C75x.
  • L2 cache is 1 MB on Oppo A5x 5G and 0.3 MB on Realme C75x.
  • Maximum supported memory is 12GB on Oppo A5x 5G and 8GB on Realme C75x.
  • Main camera resolution is 32 MP on Oppo A5x 5G and 50 MP on Realme C75x.
  • Main camera aperture is f/1.9 on Oppo A5x 5G and f/1.8 on Realme C75x.
  • Battery capacity is 6000 mAh on Oppo A5x 5G and 5600 mAh on Realme C75x.
  • 5G support is available on Oppo A5x 5G but not on Realme C75x.
  • Bluetooth version is 5.1 on Oppo A5x 5G and 5.0 on Realme C75x.
  • Download speed is 3300 Mbit/s on Oppo A5x 5G and 300 Mbit/s on Realme C75x.
Specs Comparison
Oppo A5x 5G

Oppo A5x 5G

Realme C75x

Realme C75x

Design:
water resistance Water resistant Waterproof
weight 193 g 196 g
thickness 8 mm 8 mm
width 76.2 mm 76.2 mm
height 165.7 mm 165.7 mm
volume 101.01072 cm³ 101.01072 cm³
Ingress Protection (IP) rating IP65 IP68
has a rugged build
can be folded

In terms of physical form, the Oppo A5x 5G and Realme C75x are virtually identical twins: both share the exact same dimensions (165.7 × 76.2 × 8 mm), the same volume of 101.01 cm³, and weights within 3 grams of each other (193 g vs. 196 g). In practice, this means neither phone has a meaningful ergonomic edge — they will feel essentially the same in hand, fit the same cases, and offer the same one-hand usability.

The one area where these phones genuinely diverge within this group is moisture protection. The Oppo A5x 5G carries an IP65 rating, which means it is protected against low-pressure water jets from any direction — sufficient for rain or accidental splashes, but not for submersion. The Realme C75x steps up to IP68, a significantly higher standard that certifies it can withstand continuous immersion in water (typically up to 1.5 m for 30 minutes). This is a meaningful real-world difference: the C75x can survive a drop in a sink or shallow pool, while the A5x 5G cannot.

Overall, the Realme C75x has a clear edge in this group solely due to its superior IP68 waterproofing. If water resistance matters to you — whether for outdoor use, working environments, or simple peace of mind — the C75x is the more durable choice. For users who never worry about water exposure, both phones are otherwise perfectly matched in design and handling.

Display:
Display type LCD, IPS LCD, IPS
screen size 6.67" 6.67"
pixel density 264 ppi 264 ppi
resolution 720 x 1604 px 720 x 1604 px
refresh rate 120Hz 90Hz
has branded damage-resistant glass
supports HDR10
supports HDR10+
Always-On Display
supports Dolby Vision
Has a secondary screen
has a touch screen

Both phones share the same 6.67″ LCD IPS panel with an identical resolution of 720 x 1604 px and pixel density of 264 ppi. At this screen size, 264 ppi delivers acceptable sharpness for everyday use — text and images will look reasonably clean, though discerning users may notice the difference compared to Full HD panels. Neither device supports HDR10, HDR10+, or Dolby Vision, so the viewing experience will be on par in terms of color depth and dynamic range.

Where they part ways is refresh rate and screen protection. The Oppo A5x 5G runs at 120Hz, while the Realme C75x is capped at 90Hz. That 30Hz gap is perceptible in daily use — scrolling feels noticeably smoother and UI animations appear more fluid at 120Hz, which is a genuine quality-of-life advantage for anyone who spends long hours on their phone. On top of that, the A5x 5G features branded damage-resistant glass, adding a layer of scratch and impact protection that the C75x lacks entirely.

The Oppo A5x 5G has a clear edge in this group. Its higher refresh rate makes interactions feel more responsive and polished, and its damage-resistant glass provides real-world durability that the C75x simply does not offer. For a display that looks and holds up better day-to-day, the A5x 5G is the stronger choice here.

Performance:
internal storage 128GB 256GB
RAM 4GB 8GB
Chipset (SoC) name MediaTek Dimensity 6300 MediaTek Helio G81 Ultra
GPU name Arm Mali-G57 MC2 Mali G52 MP2
CPU speed 2 x 2.4 & 6 x 2 GHz 2 x 2 & 6 x 1.8 GHz
Geekbench 6 result (multi) 2012 1391
Geekbench 6 result (single) 782 420
Has integrated LTE
RAM speed 2133 MHz 1800 MHz
semiconductor size 6 nm 12 nm
Supports 64-bit
DirectX version DirectX 12 DirectX 12
Has integrated graphics
Uses big.LITTLE technology
CPU threads 8 threads 8 threads
maximum memory bandwidth 17.07 GB/s 13.41 GB/s
L2 cache 1 MB 0.3 MB
maximum memory amount 12GB 8GB
DDR memory version 4 4
L3 cache 2 MB 1 MB

The chipset gap here is substantial. The Oppo A5x 5G runs on the MediaTek Dimensity 6300, built on a modern 6nm process, while the Realme C75x relies on the older Helio G81 Ultra at 12nm. Process node size directly affects both performance and power efficiency — a 6nm chip can deliver more computing power while generating less heat and consuming less battery. This architectural advantage shows clearly in benchmarks: the A5x 5G scores 2012 (multi-core) and 782 (single-core) in Geekbench 6, compared to just 1391 and 420 for the C75x. That is roughly a 45–85% performance lead, which translates to snappier app launches, smoother multitasking, and better handling of demanding tasks like gaming or video editing.

The C75x attempts to compensate with more RAM (8GB vs. 4GB) and double the base storage (256GB vs. 128GB). More RAM can help keep more apps alive in the background, and the extra storage is genuinely useful for media-heavy users. However, the A5x 5G's faster 2133 MHz RAM speed, higher memory bandwidth (17.07 GB/s), and larger cache (2MB L3 vs. 1MB) mean it processes data more efficiently even with less RAM — the C75x's memory advantage is partially offset by its slower 1800 MHz RAM throughput.

The Oppo A5x 5G holds a decisive performance edge in this group. Its newer silicon and benchmark results make it the stronger choice for users who prioritize speed and responsiveness. The C75x's larger RAM and storage are practical perks, but they do not close the raw processing gap that the Dimensity 6300 opens up.

Cameras:
megapixels (main camera) 32 MP 50 MP
wide aperture (main camera) 1.9f 1.8f
Has a dual-lens (or multi-lens) main camera
megapixels (front camera) 5MP 5MP
has built-in optical image stabilization
video recording (main camera) 1080 x 30 fps 1080 x 30 fps
Has a dual-tone LED flash
number of flash LEDs 1 1
has a BSI sensor
has a CMOS sensor
has continuous autofocus when recording movies
Has phase-detection autofocus for photos
supports slow-motion video recording
has a built-in HDR mode
has manual exposure
has a flash
optical zoom 0x 0x
has manual ISO
has a serial shot mode
has manual focus
has a front camera
Has laser autofocus
Shoots 360° panorama
has manual white balance
shoots raw
has touch autofocus
has manual shutter speed
can create panoramas in-camera
wide aperture (front camera) 2.2f 2.2f
Has timelapse function
Has a front-facing LED flash
has a dual-lens (or multi-lens) front camera
supports HDR10 recording
supports Dolby Vision recording
has a front-facing camera under the display
Has a RGB LED flash
has 3D photo/video recording capabilities

Strip away the feature checklist and the camera comparison comes down to two meaningful differences: resolution and aperture. The Realme C75x leads with a 50 MP main sensor versus the Oppo A5x 5G's 32 MP, and pairs it with a slightly wider f/1.8 aperture compared to the A5x 5G's f/1.9. More megapixels allow for greater detail in well-lit shots and more flexibility when cropping, while a wider aperture admits more light — a combination that gives the C75x a theoretical edge in both detail capture and low-light performance.

Beyond those two points, the cameras are functionally identical across every other measured dimension: both shoot at 1080p/30fps, share the same 5 MP front camera with an f/2.2 aperture, and offer the same manual controls, autofocus systems, and shooting modes. Neither phone has OIS, a multi-lens setup, or any advanced video features like HDR10 recording. This is a clean, narrow comparison — the feature parity is near-total.

The Realme C75x has a modest but real edge here. Its higher-resolution sensor and marginally wider aperture make it the more capable shooter on paper, particularly in challenging lighting. For users who lean heavily on their smartphone camera, the C75x is the better-equipped option in this group.

Operating system:
Android version Android 15 Android 15
has clipboard warnings
has location privacy options
has camera/microphone privacy options
has Mail Privacy Protection
has theme customization
can block app tracking
blocks cross-site tracking
has on-device machine learning
has notification permissions
has media picker
Can play games while they download
has dark mode
has Wi-Fi password sharing
has battery health check
has an extra dim mode
has focus modes
has dynamic theming
can offload apps
Has customizable notifications
has Live Text
has full-page screenshots
supports split screen
gets direct OS updates
has PiP
Can be used as a PC
Has sharing intents
has a child lock
Supports widgets
Is free and open source
Has offline voice recognition
has voice commands
Tracks the current position of a mobile device
is a multi-user system
has Quick Start

This is a rare case of a complete tie. Both the Oppo A5x 5G and the Realme C75x run Android 15 and match each other point-for-point across every single measured feature in this category — privacy controls, accessibility options, multitasking capabilities, and productivity tools are all identical.

Practically speaking, users of either phone get a well-rounded Android experience: meaningful privacy tools like location and camera/microphone controls, app tracking blocking, and clipboard warnings are all present. Day-to-day usability features — split-screen, picture-in-picture, dynamic theming, dark mode, and offline voice recognition — are equally available on both. Neither phone receives direct OS updates or supports Wi-Fi password sharing, which are shared limitations worth noting.

This group is a dead tie. No data point in the provided specs separates these two phones on software. A buyer's decision here should be driven entirely by the differences found in other spec groups.

Battery:
battery power 6000 mAh 5600 mAh
has wireless charging
Supports fast charging
charging speed 45W 45W
has a removable battery
has a battery level indicator
has a rechargeable battery

Battery capacity is the one differentiator here. The Oppo A5x 5G packs a 6000 mAh cell versus the Realme C75x's 5600 mAh — a 400 mAh gap that, while not dramatic, is meaningful over the course of a long day. All else being equal, the larger reserve in the A5x 5G translates to moderately more screen-on time before needing a top-up, which matters for heavy users or those frequently away from a charger.

Where charging is concerned, both phones are perfectly matched at 45W fast charging. This means refill speeds will be virtually identical — both can recover significant charge in a short time, so the A5x 5G's larger battery does not come at the cost of longer wait times at the plug. Neither phone offers wireless charging, which is a shared limitation at this price tier.

The Oppo A5x 5G has a slight edge in this group by virtue of its larger battery. The charging experience is identical, so the A5x 5G simply offers more raw endurance — a straightforward win for users who prioritize going longer between charges.

Audio:
has a socket for a 3.5 mm audio jack
has stereo speakers
has aptX
has LDAC
has aptX HD
has aptX Adaptive
has aptX Lossless

Audio is another category where these two phones are indistinguishable on paper. Both the Oppo A5x 5G and the Realme C75x feature stereo speakers and drop the 3.5mm headphone jack — meaning wired audio requires an adapter or USB-C headphones on either device. Stereo speakers are a genuine plus for media consumption, delivering a wider soundstage than a single mono driver when watching videos or playing games.

Neither phone supports any high-resolution Bluetooth audio codec — no aptX, aptX HD, LDAC, or any of their variants. For wireless listening, both are limited to standard Bluetooth audio quality, which is adequate for casual use but will not satisfy audiophiles seeking lossless or near-lossless wireless playback.

This group is a complete tie. Every audio specification is identical across both devices, including the shared absence of a headphone jack and premium wireless codecs. Audio quality in practice will depend on factors outside the scope of these specs, and neither phone holds any measurable advantage here.

Connectivity & Features:
release date May 2025 March 2025
has 5G support
Wi-Fi version Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac) Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac)
SIM cards 2 SIM 2 SIM
Bluetooth version 5.1 5
has an external memory slot
Has USB Type-C
USB version 2 2
has NFC
download speed 3300 MBits/s 300 MBits/s
Has a fingerprint scanner
has emergency SOS via satellite
has crash detection
is DLNA-certified
has a gyroscope
supports ANT+
Has a heart rate monitor
has GPS
has a compass
supports Wi-Fi
Has an infrared sensor
has an accelerometer
has a cellular module
Has a barometer
has an HDMI output
Uses 3D facial recognition
Has an iris scanner
Stylus included
supports Galileo
Has motion tracking
Has optical tracking
Has a built-in projector

The single most consequential difference in this group is cellular connectivity. The Oppo A5x 5G supports 5G, while the Realme C75x is limited to 4G LTE — and the download speed figures make the real-world gap impossible to ignore: 3300 Mbps versus just 300 Mbps. That is an eleven-fold difference in peak theoretical throughput. In practice, this means the A5x 5G can leverage next-generation network speeds for faster streaming, quicker downloads, and more responsive mobile data in areas with 5G coverage. For users in markets where 5G infrastructure is expanding, the A5x 5G is meaningfully more future-proof.

The remaining differences are minor. The A5x 5G edges ahead with Bluetooth 5.1 versus the C75x's Bluetooth 5.0, offering marginally improved connection stability and directionality — though the practical difference in daily use is subtle. Wi-Fi capability, USB Type-C, dual SIM support, expandable storage, GPS, and the fingerprint scanner are all identical across both devices, making those a non-factor in this comparison.

The Oppo A5x 5G has a clear and significant advantage here. Its 5G support and dramatically higher download ceiling make it the better-connected device by a wide margin. Unless a buyer is certain their region has no 5G rollout planned, the A5x 5G is the more capable and forward-looking choice in this category.

Miscellaneous:
has a video light
Has sapphire glass display
Has a curved display
Has an e-paper display

The Miscellaneous category offers nothing to separate these two phones. Every data point — the presence of a video light, the absence of sapphire glass, a curved display, or an e-paper screen — is identical across both the Oppo A5x 5G and the Realme C75x.

This group is a complete tie. With only four attributes measured and all four matching, there is no basis for differentiating the two devices here. Buyers should weigh this category as a non-factor and focus their decision on the meaningful differences identified in other spec groups.

Comparison Summary & Verdict

After a thorough comparison, both phones serve distinct types of users. The Oppo A5x 5G stands out with its superior Dimensity 6300 chipset built on a 6 nm process, a smoother 120Hz display, a larger 6000 mAh battery, damage-resistant glass, and crucially, 5G connectivity with dramatically faster download speeds — making it the better pick for performance-focused users and those future-proofing their purchase. The Realme C75x, on the other hand, counters with a higher-resolution 50 MP main camera, more base RAM and storage (8GB + 256GB), and a robust IP68 waterproof rating, making it the stronger choice for users who prioritize photography, storage headroom, and peace of mind near water.

Oppo A5x 5G
Buy Oppo A5x 5G if...

Buy the Oppo A5x 5G if you want 5G connectivity, a faster processor, a smoother 120Hz display, and a bigger battery for all-day use.

Realme C75x
Buy Realme C75x if...

Buy the Realme C75x if you prioritize a higher-resolution 50 MP camera, more RAM and storage out of the box, and a superior IP68 waterproof rating.