The Xiaomi Redmi K70 Ultra and Oppo K12x represent compelling options in the increasingly competitive mid-range smartphone market. While both leverage Mediatek's Dimensity series, they target slightly different users. The K70 Ultra aims for near-flagship performance with its Dimensity 9300+, while the K12x focuses on delivering a solid experience at a more accessible price point with the Dimensity 6300. This comparison dissects the key differences to help you choose the right phone.
🏆 Quick Verdict
For users prioritizing raw performance and ultra-fast charging, the Xiaomi Redmi K70 Ultra is the clear winner. Its Dimensity 9300+ chipset offers a substantial leap in processing power, and the 120W charging is significantly faster than the K12x’s 45W. However, the Oppo K12x remains a strong contender for budget-conscious buyers seeking a reliable daily driver.
| Network |
|---|
| 2G bands | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G bands | HSDPA 900 / 2100 | HSDPA 800 / 850 / 900 / 1700(AWS) / 2100 |
| 4G bands | 1, 3, 5, 8, 28, 40, 41 | 1, 3, 4, 5, 7, 8, 18, 19, 26, 28, 34, 38, 39, 40, 41, 42, 48, 66 |
| 5G bands | 1, 3, 5, 8, 28, 40, 41, 77, 88 SA/NSA | 1, 3, 5, 7, 8, 28, 66, 38, 40, 41, 48, 77, 78 SA/NSA |
| Speed | HSPA, LTE, 5G | HSPA, LTE, 5G |
| Technology | GSM / HSPA / LTE / 5G | GSM / CDMA / HSPA / CDMA2000 / LTE / 5G |
| Launch |
|---|
| Announced | 2024, July 29 | 2024, July 19 |
| Status | Available. Released 2024, August 02 | Available. Released 2024, July 19 |
| Body |
|---|
| Build | - | Glass front, aluminum frame |
| Dimensions | 165.7 x 76 x 7.7 mm (6.52 x 2.99 x 0.30 in) | 160.4 x 75.1 x 8.4 mm (6.31 x 2.96 x 0.33 in) |
| SIM | Nano-SIM + Nano-SIM | Nano-SIM + Nano-SIM |
| Weight | 186 g (6.56 oz) | 211 g (7.44 oz) |
| Display |
|---|
| Protection | Panda glass | Scratch/drop-resistant glass |
| Resolution | 720 x 1604 pixels, 20:9 ratio (~264 ppi density) | 1220 x 2712 pixels, 20:9 ratio (~446 ppi density) |
| Size | 6.67 inches, 107.2 cm2 (~85.2% screen-to-body ratio) | 6.67 inches, 107.4 cm2 (~89.1% screen-to-body ratio) |
| Type | IPS LCD, 120Hz, 1000 nits (HBM) | OLED, 68B colors, 144Hz, Dolby Vision, HDR10+, 1600 nits (HBM), 4000 nits (peak) |
| Platform |
|---|
| CPU | Octa-core (2x2.4 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55) | Octa-core (1x3.25 GHz Cortex-X4 & 3x2.85 GHz Cortex-X4 & 4x2.0 GHz Cortex-A720) |
| Chipset | Mediatek Dimensity 6300 (6 nm) | Mediatek Dimensity 9300+ (4 nm) |
| GPU | Mali-G57 MC2 | Immortalis-G720 MC12 |
| OS | Android 14, ColorOS 14 | Android 14, HyperOS |
| Memory |
|---|
| Card slot | microSDXC | No |
| Internal | 128GB 6GB RAM, 256GB 8GB RAM | 256GB 12GB RAM, 512GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM, 1TB 24GB RAM |
| Main Camera |
|---|
| Dual | 32 MP, f/1.8, (wide), PDAF
Auxiliary lens | - |
| Features | LED flash, HDR, panorama | Color spectrum sensor, Dual-LED dual-tone flash, HDR, panorama |
| Triple | - | 50 MP, f/1.7, 23mm (wide), 1/1.56", 1.0µm, PDAF, OIS
8 MP, 119˚ (ultrawide), 1/4.0", 1.12µm
2 MP (macro) |
| Video | 1080p@30/60fps | 8K@24/30fps, 4K@24/30/60fps, 1080p@30/60/120/240/960fps, gyro-EIS |
| Selfie camera |
|---|
| Features | - | HDR |
| Single | 8 MP, f/2.0, (wide) | 20 MP, (wide), 1/2.0", 0.8µm |
| Video | 1080p@30fps | 1080p@30fps |
| Sound |
|---|
| 35mm jack | Yes | No |
| Loudspeaker | Yes | Yes, with stereo speakers |
| Comms |
|---|
| Bluetooth | 5.3, A2DP, LE, aptX HD | 5.4, A2DP, LE, LHDC 5 |
| Infrared port | - | Yes |
| NFC | No | Yes |
| Positioning | GPS, GALILEO, GLONASS, BDS, QZSS | GPS (L1+L5), BDS (B1I+B1C+B2a+B2b), GALILEO (E1+E5a+E5b), QZSS (L1+L5), NavIC (L5), GLONASS |
| Radio | No | Unspecified |
| USB | USB Type-C 2.0, OTG | USB Type-C |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band | Wi-Fi 802.11 a/b/g/n/ac/6/7, dual-band, Wi-Fi Direct |
| Features |
|---|
| Sensors | Fingerprint (side-mounted), accelerometer, proximity, compass | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass |
| Battery |
|---|
| Charging | 45W wired, PD, 50% in 30 min | 120W wired, PD3.0, 100% in 24 min |
| Type | 5100 mAh | Li-Po 5500 mAh |
| Misc |
|---|
| Colors | Breeze Blue, Midnight Violet | Black, White, Violet, Green Championship Edition, Orange Championship Edition |
| Models | CPH2667 | 2407FRK8EC |
| Price | ₹ 14,999 | About 330 EUR |
| SAR | 1.18 W/kg (head) 1.19 W/kg (body) | - |
Oppo K12x
- More affordable price point
- Reliable performance for everyday tasks
- Decent battery life
- Significantly slower charging
- Less powerful chipset for gaming
- Likely inferior camera performance
Xiaomi Redmi K70 Ultra
- Exceptional performance with Dimensity 9300+
- Ultra-fast 120W charging
- Likely superior display and camera
- Higher price tag
- Potentially more heat generation under heavy load
- May be overkill for basic users
Display Comparison
Context data lacks display specifics, but given the K12x’s positioning, it likely features a 6.67-inch AMOLED panel with a standard 120Hz refresh rate. The K70 Ultra, aiming higher, likely boasts a superior display – potentially LTPO AMOLED for adaptive refresh rates up to 144Hz, resulting in smoother scrolling and improved power efficiency. Expect the K70 Ultra to also achieve higher peak brightness, enhancing visibility in direct sunlight. Bezels are also likely to be slimmer on the K70 Ultra, contributing to a more immersive viewing experience.
Camera Comparison
Without detailed camera specs, we can infer differences based on the overall positioning. The K70 Ultra likely features a larger main sensor with optical image stabilization (OIS), enabling better low-light performance and sharper images. The K12x will likely have a more modest camera setup, prioritizing cost-effectiveness. Lens apertures will likely be wider on the K70 Ultra, further improving low-light capabilities. Image processing algorithms will also differ, with Xiaomi typically favoring vibrant, saturated colors, while Oppo often aims for more natural tones.
Performance
The core difference lies in the chipsets. The Redmi K70 Ultra’s Dimensity 9300+ (4nm) is a significant upgrade over the K12x’s Dimensity 6300 (6nm). The 9300+ features a 1x3.25 GHz Cortex-X4 prime core, three 2.85 GHz Cortex-X4 performance cores, and four 2.0 GHz Cortex-A720 efficiency cores, offering substantially higher CPU and GPU performance. The K12x’s 2x2.4 GHz Cortex-A76 and 6x2.0 GHz Cortex-A55 configuration is adequate for daily tasks but will struggle with graphically intensive games and multitasking. The 4nm process node of the 9300+ also translates to better thermal efficiency, minimizing throttling during sustained workloads. Expect the K70 Ultra to handle demanding games at higher settings and frame rates.
Battery Life
The K12x’s 45W wired charging, while supporting PD, takes 30 minutes to reach 50% charge. The K70 Ultra’s 120W wired charging with PD3.0 promises a full charge in just 24 minutes. This difference is substantial for users who prioritize quick top-ups. While battery capacity isn’t specified, the K70 Ultra’s more efficient chipset and potentially optimized software could offset a slightly smaller battery size compared to the K12x, delivering comparable real-world battery life.
Buying Guide
Buy the Oppo K12x if you need a dependable smartphone for everyday tasks, social media, and light gaming, and value affordability above all else. Its Dimensity 6300 provides sufficient power for these use cases. Buy the Xiaomi Redmi K70 Ultra if you prioritize demanding mobile gaming, content creation, and require the fastest possible charging speeds. The Dimensity 9300+ and 120W charging are geared towards power users.
Frequently Asked Questions
❓ Will the Dimensity 9300+ in the Redmi K70 Ultra get noticeably hot during extended gaming sessions?
While the Dimensity 9300+ is a powerful chip, its performance does generate heat. However, the 4nm process and Xiaomi’s thermal management system (likely including vapor chamber cooling) are designed to mitigate throttling. Expect some warmth, but not to the point of severely impacting performance during typical gaming sessions. The K12x, with its less powerful chipset, will run cooler.
❓ Is the 45W charging on the Oppo K12x slow compared to other phones in its price range?
45W charging is becoming increasingly common in the mid-range segment, but the Redmi K70 Ultra’s 120W charging sets a new standard. While 45W is adequate for overnight charging, it will take considerably longer to fully charge the K12x compared to the K70 Ultra. If fast charging is a priority, the K70 Ultra is the better choice.
❓ Does the Redmi K70 Ultra support high frame rates in popular games like PUBG Mobile or Genshin Impact?
The Dimensity 9300+ is more than capable of handling PUBG Mobile and Genshin Impact at high frame rates (60fps or higher). The K70 Ultra likely supports frame rate customization within the game settings, allowing you to prioritize smoothness or battery life. Expect a significantly smoother gaming experience compared to the K12x.
