Xiaomi Redmi K40S vs Poco F4: A Head-to-Head Comparison
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🏆 Quick Verdict
Both phones offer excellent performance thanks to the Snapdragon 870. The Poco F4 edges out the K40S with a brighter display and potentially slightly improved camera capabilities. However, the K40S might offer a more refined software experience depending on regional variations. Ultimately, the F4 provides a more compelling package for most users.
| PHONES | ||
|---|---|---|
| Phone Names | Xiaomi Redmi K40S | Xiaomi Poco F4 |
| Network | ||
|---|---|---|
| 2G bands | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G bands | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 |
| 4G bands | 1, 2, 3, 4, 5, 8, 18, 19, 26, 34, 38, 39, 40, 41, 42 | 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 38, 40, 41 |
| 5G bands | 1, 3, 5, 8, 28, 38, 40, 41, 77, 78 SA/NSA | 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 77, 78 SA/NSA |
| Speed | HSPA, LTE, 5G | HSPA, LTE, 5G |
| Technology | GSM / CDMA / HSPA / CDMA2000 / LTE / 5G | GSM / HSPA / LTE / 5G |
| CDMA2000 1x | - | |
| Launch | ||
|---|---|---|
| Announced | 2022, March 17 | 2022, June 23 |
| Status | Available. Released 2022, March 17 | Available. Released 2022, June 27 |
| Body | ||
|---|---|---|
| Build | Glass front (Gorilla Glass 5), plastic back | Glass front (Gorilla Glass 5), glass back |
| Dimensions | 163.2 x 76 x 7.7 mm (6.43 x 2.99 x 0.30 in) | 163.2 x 76 x 7.7 mm (6.43 x 2.99 x 0.30 in) |
| SIM | Nano-SIM + Nano-SIM | Nano-SIM + Nano-SIM |
| Weight | 195 g (6.88 oz) | 195 g (6.88 oz) |
| Splash resistant | IP53, dust and splash resistant | |
| Display | ||
|---|---|---|
| Protection | Corning Gorilla Glass 5 | Corning Gorilla Glass 5 |
| Resolution | 1080 x 2400 pixels, 20:9 ratio (~395 ppi density) | 1080 x 2400 pixels, 20:9 ratio (~395 ppi density) |
| Size | 6.67 inches, 107.4 cm2 (~86.6% screen-to-body ratio) | 6.67 inches, 107.4 cm2 (~86.6% screen-to-body ratio) |
| Type | AMOLED, 120Hz, HDR10+, 1300 nits (peak) | AMOLED, 120Hz, HDR10+, Dolby Vision, 900 nits (HBM), 1300 nits (peak) |
| Platform | ||
|---|---|---|
| CPU | Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585) | Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585) |
| Chipset | Qualcomm SM8250-AC Snapdragon 870 5G (7 nm) | Qualcomm SM8250-AC Snapdragon 870 5G (7 nm) |
| GPU | Adreno 650 | Adreno 650 |
| OS | Android 12, MIUI 13 | Android 12, upgradable to Android 13, MIUI 14.2 for POCO |
| Memory | ||
|---|---|---|
| Card slot | No | No |
| Internal | 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM | 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM |
| UFS 3.1 | UFS 3.1 | |
| Main Camera | ||
|---|---|---|
| Features | Color spectrum sensor, Dual-LED dual-tone flash, HDR, panorama | LED flash, HDR, panorama |
| Single | 20 MP, (wide) | - |
| Triple | 48 MP, f/1.8, (wide), 1/2.0", 0.8µm, PDAF, OIS 8 MP, 119˚ (ultrawide) 2 MP (macro) | 64 MP, f/1.8, (wide) 1/2.0", 0.7µm, PDAF, OIS 8 MP, f/2.2, 119˚ (ultrawide), 1/4.0", 1.12µm 2 MP (macro) |
| Video | 4K@30fps, 1080p@30/60/120fps, 720p@960fps; gyro-EIS | 4K@30/60fps, 1080p@30/60fps |
| Selfie camera | ||
|---|---|---|
| Single | 20 MP, (wide) | 20 MP, f/2.5, (wide), 1/3.06", 1.0µm |
| Video | 1080p@30/120fps | 1080p@30fps |
| Sound | ||
|---|---|---|
| 3.5mm jack | No | No |
| 35mm jack | No | No |
| Loudspeaker | Yes, with stereo speakers | Yes, with stereo speakers |
| 24-bit/192kHz audio | 24-bit/192kHz audio | |
| Comms | ||
|---|---|---|
| Bluetooth | 5.2, A2DP, LE | 5.2, A2DP, LE |
| Infrared port | - | Yes |
| NFC | Yes | Yes (market/region dependent) |
| Positioning | GPS (L1+L5), GLONASS (L1), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5) | GPS (L1+L5), GLONASS (L1), BDS (B1I+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5) |
| Radio | No | No |
| USB | USB Type-C 2.0, OTG | USB Type-C 2.0, OTG |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct | Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct |
| Features | ||
|---|---|---|
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass |
| Battery | ||
|---|---|---|
| Charging | 67W wired, PD3.0, QC3, 100% in 38 min | 67W wired, PD3.0, QC3, 100% in 38 min |
| Type | Li-Po 4500 mAh | Li-Po 4500 mAh |
| Misc | ||
|---|---|---|
| Colors | Black, Gray, Blue, Green | Moonlight Silver, Night Black, Nebula Green |
| Models | - | 22021211RG, 22021211RI |
| Price | About 260 EUR | ₹ 16,999 |
| Tests | ||
|---|---|---|
| Battery life | - | Endurance rating 101h |
| Camera | - | Photo / Video |
| Display | - | Contrast ratio: Infinite (nominal) |
| Loudspeaker | - | -26.1 LUFS (Good) |
| Performance | - | AnTuTu: 590961 (v8), 698586 (v9) GeekBench: 3190 (v5.1) GFXBench: 49fps (ES 3.1 onscreen) |
Xiaomi Redmi K40S
- Potentially cleaner software experience (region dependent)
- Compact design
- Fast 67W charging
- Lower display brightness compared to F4
- Potentially slightly less impressive camera
Xiaomi Poco F4
- Brighter, more vibrant display
- Potentially better camera performance
- Excellent battery life (101h endurance rating)
- Fast 67W charging
- MIUI software can be polarizing
- Design might be less premium than some competitors
Display Comparison
The Poco F4 boasts a significant advantage with a measured peak brightness of 1003 nits, making it much easier to see outdoors. The Redmi K40S display is still good, but lacks the same level of brightness. The Poco F4's infinite contrast ratio (nominal) suggests excellent black levels and vibrant colors. While the K40S has a good AMOLED panel, the F4's brightness is a noticeable upgrade.
Camera Comparison
While both phones are listed as having 'Photo / Video' capabilities, the Poco F4 is generally considered to have a slightly better camera system. The F4 often features a higher resolution primary sensor and potentially improved image processing algorithms. The K40S camera is still capable, but the F4 offers a slight edge in image quality, particularly in good lighting. Low-light performance is likely similar.
Performance
Both devices share the same Snapdragon 870 chipset and CPU configuration, ensuring comparable performance in everyday tasks and gaming. You shouldn't notice a significant difference in speed or responsiveness between the two. Thermal management will be a key factor in sustained performance, and reviews suggest both handle it reasonably well.
Battery Life
The Poco F4 claims an endurance rating of 101 hours, suggesting superior battery life. While this is a standardized test, it indicates the F4 likely offers longer usage between charges. Both phones support 67W fast charging, allowing for a full charge in approximately 38 minutes.
Buying Guide
The Xiaomi Redmi K40S is ideal for users prioritizing a potentially cleaner software experience and a slightly more compact design. The Xiaomi Poco F4 is a better choice for those who value a brighter, more vibrant display, and potentially slightly better camera performance, especially in well-lit conditions.