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- K9x vs V21 5G
OPPO K9x vs Vivo V21 5G
What K9x does better (7) and where V21 5G wins (11) — every spec side by side.
Dimensions
Size comparison
K9xV21 5G
| K9x | V21 5G | Difference | |
|---|---|---|---|
| Height | 162.2 mm | 159.7 mm | +2.5 mm |
| Width | 74.8 mm | 73.9 mm | +0.9 mm |
| Thickness | 8.8 mm | 7.3 mm | +1.5 mm |
| Weight | 194 g | 176 g | +18 g |
Drawn to the same scale from the official dimensions (front and side).
Why is K9x better than V21 5G?
- Battery capacity5,000 mAh vs 4,000 mAh+25%
- RAM12 GB vs 8 GB+50%
- Storage (max)512 GB vs 256 GB2×
- 3.5 mm headphone jackYes · V21 5G: No
- Peak brightness600 nits vs 500 nits+20%
- Process6 nm vs 7 nm+17%
- Main camera aperturef/1.7 vs f/1.8+6%
Why is V21 5G better than K9x?
- OLED panelNo · K9x: Yes
- Optical stabilisationNo · K9x: Yes
- NFCNo · K9x: Yes
- Selfie camera16 MP vs 44 MP2.8×
- Rear cameras1 vs 22×
- Ultra-wide cameraNo · K9x: Yes
- Max video1080p vs 4K
- 4K selfie videoNo · K9x: Yes
- Weight194 g vs 176 g+10%
- Thickness8.8 mm vs 7.3 mm+21%
- Charged in 30 min56% vs 63%+12%
Specifications
Side by side
| Design | ||
| Weight | 194 g | 176 g |
| Thickness | 8.8 mm | 7.3 mm |
| Height | 162.2 mm | 159.7 mm |
| Width | 74.8 mm | 73.9 mm |
| Frame | — | Plastic |
| Back | — | Plastic |
| Glass protection | Aluminosilicate glass | — |
| Colours | Black, Blue | Dusk Blue, Sunset Dazzle, Arctic White |
| Display | ||
| Screen size | 6.5″ | 6.4″ |
| Panel | IPS LCD | AMOLED |
| OLED panel | No | Yes |
| Resolution (width) | 1,080 px | 1,080 px |
| Resolution (height) | 2,400 px | 2,400 px |
| Pixel density | 405 ppi | 409 ppi |
| Refresh rate | 90 Hz | 90 Hz |
| Peak brightness | 600 nits | 500 nits |
| Measured brightness | — | 761 nits |
| Screen-to-body ratio | 84.2% | 84.8% |
| HDR | — | Yes |
| Performance | ||
| Chipset | Mediatek Dimensity 810 | Mediatek Dimensity 800U |
| Chip maker | MediaTek | MediaTek |
| Process | 6 nm | 7 nm |
| CPU cores | 8 | 8 |
| CPU frequency | 2.4 GHz | 2.4 GHz |
| GPU | Mali-G57 MC2 | Mali-G57 MC3 |
| AnTuTu score | — | 336,699 |
| Geekbench 6 (multi-core) | — | 6,516 |
| Memory | ||
| RAM | 12 GB | 8 GB |
| Storage (max) | 512 GB | 256 GB |
| Storage (base) | 128 GB | 128 GB |
| Storage type | UFS 2.2 | UFS 2.2 |
| Memory card slot | Yes | Yes |
| Camera | ||
| Main camera | 64 MP | 64 MP |
| Main camera aperture | f/1.7 | f/1.8 |
| Main sensor size | — | 1/1.72" |
| Rear cameras | 1 | 2 |
| Optical stabilisation | No | Yes |
| Ultra-wide camera | No | Yes |
| Telephoto camera | No | No |
| Max video | 1080p | 4K |
| 4K video frame rate | — | 30 fps |
| Selfie camera | 16 MP | 44 MP |
| 4K selfie video | No | Yes |
| Battery | ||
| Battery capacity | 5,000 mAh | 4,000 mAh |
| Battery type | Li-Po | — |
| Wired charging | 33 W | 33 W |
| Charged in 30 min | 56% | 63% |
| Wireless charging | No | No |
| Connectivity | ||
| 5G | Yes | Yes |
| eSIM | No | No |
| Dual SIM | Yes | Yes |
| Wi-Fi standard | Wi-Fi 5 | Wi-Fi 5 |
| Bluetooth | 5.1 | 5.1 |
| NFC | No | Yes |
| USB | USB Type-C 2.0 | USB Type-C 2.0 |
| USB version | 2 | 2 |
| Satellite navigation | GLONASS, GALILEO, BDS | GLONASS, GALILEO, BDS |
| Features | ||
| Stereo speakers | No | No |
| 3.5 mm headphone jack | Yes | No |
| Loudspeaker loudness | — | -28.2 LUFS |
| Fingerprint sensor | Side | Under display |
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass |
| SAR (head) | — | 1.05 W/kg |
| Software | ||
| OS at launch | Android 11 | Android 11 |
| Platform | Android | Android |
| Interface | ColorOS 11.1 | Funtouch 11.1 |
