Xiaomi Redmi K40 vs Redmi K30
Here we compared two smartphones: the 6.67-inch Xiaomi Redmi K40 (with Qualcomm Snapdragon 870 5G) that was released on February 25, 2021, against the Xiaomi Redmi K30, which is powered by Qualcomm Snapdragon 730G and came out 14 months before. On this page, you will find tests, full specs, strengths, and weaknesses of each of the gadgets.
Key differences
Reasons to consider the Xiaomi Redmi K40
- Water-resistant body (IP53 classification)
- 2.2x better performance in AnTuTu Benchmark (720K versus 335K)
- Delivers 83% higher maximum brightness (1313 against 717 nits)
- Newer Bluetooth version (v5.1)
- Uses a faster type of memory: LPDDR5 2750 MHz
- Stereo speakers
- More recent OS version: Android 11 versus 10
- Super AMOLED display (versus competitor's IPS LCD)
- The phone is 1-year and 2-months newer
Reasons to consider the Xiaomi Redmi K30
- Optical image stabilization
- Expandable storage via MicroSD card up to 256GB
- Includes a 3.5 mm headphone audio jack port
Review
Display
Screen quality, color accuracy, brightness
Performance
CPU/GPU performance in apps and games
Battery
Battery life, charging type and speed
Camera
Photo and video recording quality
Connectivity
Networks, ports, data transmission
NanoReview score
Final comparison evaluation
Value for money
You can enter your local price of these phones (in USD or any other currency) and click on the "Calculate" button to see which one has a better value for money.
Tests and specifications
Comparison table of technical specifications and testsDisplay
| Type | Super AMOLED | IPS LCD |
| Size | 6.67 inches | 6.67 inches |
| Resolution | 1080 x 2400 pixels | 1080 x 2400 pixels |
| Aspect ratio | 20:9 | 20:9 |
| PPI | 395 ppi | 395 ppi |
| Refresh rate | 120 Hz | 120 Hz |
| HDR support | Yes, HDR10+ | Yes, HDR10 |
| Screen protection | Corning Gorilla Glass 5 | Corning Gorilla Glass 5 |
| Screen-to-body ratio | 85.9% | 84.8% |
| Display features | - DCI-P3 - Always-On Display - DC Dimming |
- Always-On Display - DC Dimming |
Max. Brightness
Design and build
| Height | 163.7 mm (6.44 inches) | 165.3 mm (6.51 inches) |
| Width | 76.4 mm (3.01 inches) | 76.6 mm (3.02 inches) |
| Thickness | 7.8 mm (0.31 inches) | 8.8 mm (0.35 inches) |
| Weight | 196 gramm (6.91 oz) | 208 gramm (7.34 oz) |
| Waterproof | IP53 | No |
| Rear material | Glass | Glass |
| Frame material | Plastic | Plastic |
| Colors | White, Black | White, Blue, Red, Purple |
| Fingerprint scanner | Yes, in home button | Yes, in home button |
Screen-to-body ratio
Performance
| Chipset | Qualcomm Snapdragon 870 5G | Qualcomm Snapdragon 730G |
| Max. clock | 3200 MHz | 2200 MHz |
| CPU cores | 8 (1 + 3 + 4) | 8 (2 + 6) |
| Architecture | - 4 cores at 1.8 GHz: Kryo 585 Silver (Cortex-A55) - 3 cores at 2.42 GHz: Kryo 585 Gold (Cortex-A77) - 1 core at 3.2 GHz: Kryo 585 Prime (Cortex-A77) |
- 6 cores at 1.8 GHz: Kryo 470 Silver (Cortex-A55) - 2 cores at 2.2 GHz: Kryo 470 Gold (Cortex-A76) |
| L3 cache | 4 MB | - |
| Lithography process | 7 nanometers | 8 nanometers |
| Graphics | Adreno 650 | Adreno 618 |
| GPU clock | 675 MHz | 825 MHz |
| FLOPS | ~1372 GFLOPS | ~422 GFLOPS |
| RAM size | 6, 8, 12 GB | 6, 8 GB |
| Memory type | LPDDR5 | LPDDR4X |
| Memory clock | 2750 MHz | 1866 MHz |
| Channels | 4 | 2 |
| Storage size | 128, 256 GB | 64, 128, 256 GB |
| Storage type | UFS 3.1 | UFS 2.1 |
| Memory card | No | MicroSD |
| Memory card max. size | - | Up to 256 GB |
Benchmarks
Geekbench 5 (Single-Core)
Geekbench 5 (Multi-Core)
AnTuTu Benchmark 9
| CPU | - | 100012 |
| GPU | - | 88659 |
| Memory | - | 53417 |
| UX | - | 91789 |
| Total score | 720401 | 335009 |
3DMark Wild Life Performance
| Stability | 90% | - |
| Graphics test | 25 FPS | - |
| Graphics score | 4262 | - |
| PCMark 3.0 score | 12182 | - |
Software
| Operating system | Android 11 | Android 10 |
| ROM | MIUI 12.5 Enhanced | MIUI 12 |
Battery
| Capacity | 4520 mAh | 4500 mAh |
| Charge power | 33 W | 27 W |
| Battery type | Li-Po | Li-Po |
| Replaceable | No | No |
| Wireless charging | No | No |
| Reverse charging | No | No |
| Fast charging | Yes (70% in 30 min) | Yes (100% in 70 min) |
| Full charging time | 0:52 hr | 1:10 hr |
| Web browsing | - | 11:08 hr |
| Watching video | - | 09:48 hr |
| Gaming | - | 05:39 hr |
| Standby | - | 148 hr |
General battery life
Camera
| Matrix | 48 megapixels | 64 megapixels |
| Image resolution | 8000 x 6000 | 9000 x 7000 |
| Zoom | Digital | Digital |
| Flash | LED | Dual LED |
| Stabilization | Digital | Optical |
| 8K video recording | No | No |
| 4K video recording | Up to 30FPS | Up to 30FPS |
| 1080p video recording | Up to 60FPS | Up to 120FPS |
| Slow motion | 960 FPS (720p) | 960 FPS (720p) |
| Angle of widest lens | 119° | 120° |
| Lenses | 3 (48 MP + 8 MP + 5 MP) | 4 (64 MP + 8 MP + 2 MP + 2 MP) |
| Wide (main) lens | - 48 MP - Aperture: f/1.8 - Focal length: 26 mm - Pixel size: 0.8 micron - Sensor: 1/2.0" (CMOS) - Phase autofocus |
- 64 MP - Aperture: f/1.9 - Focal length: 26 mm - Pixel size: 0.8 micron - Sensor: 1/1.7", Sony IMX686 (Exmor-RS CMOS) - Phase autofocus - Optical stabilization |
| Ultra-wide lens | - 8 MP - Aperture: f/2.2 - Pixel size: 1.12 micron - Sensor: 1/4.0" (CMOS) |
- 8 MP - Aperture: f/2.2 - Focal length: 13 mm - Pixel size: 1.12 micron - Sensor: 1/4", OmniVision OV8856 (CMOS) |
| Macro lens | - 5 MP - Aperture: f/2.4 - Focal length: 50 mm - Pixel size: 1.12 micron - Sensor: 1/5.0" (CMOS) |
- 2 MP - Aperture: f/2.4 - Focal length: 1.94 mm - Pixel size: 1.75 micron - Sensor: 1/5", GalaxyCore GC02M1 (CMOS) |
| Depth lens | - | - 2 MP - Aperture: f/2.4 - Pixel size: 1.75 micron - Sensor: 1/5", GalaxyCore GC02M1 (CMOS) |
| Camera features | - Bokeh mode - Pro mode |
- Bokeh mode - Pro mode |
| Megapixels | 20 megapixels | 20 megapixels |
| Image resolution | 4608 x 3456 | 5963 x 3354 |
| Aperture | f/2.5 | f/2.2 |
| Focal length | 26 mm | 27 mm |
| Pixel size | 0.8 microns | 0.8 microns |
| Sensor type | CMOS | ISOCELL CMOS |
| Sensor size | 1/3.4" | 1/3.4" |
| Video resolution | 1080p (Full HD) at 30 FPS | 1080p (Full HD) at 30 FPS |
Connectivity
| Wi-Fi standard | Wi-Fi 6E (802.11 a/b/g/n/ac/ax) | Wi-Fi 5 (802.11 b/g/n/ac) |
| Wi-Fi features | - Dual Band - Wi-Fi Direct - Wi-Fi Hotspot - Wi-Fi Display |
- Dual Band - Wi-Fi Direct - Wi-Fi Hotspot - Wi-Fi Display |
| Bluetooth version | 5.1 | 5 |
| Bluetooth features | LE, HID, A2DP | LE, A2DP |
| USB type | USB Type-C | USB Type-C |
| USB version | 2 | 2 |
| USB features | - Charging - USB-Storage mode - OTG |
- Charging - USB-Storage mode - OTG |
| GPS | GPS, GLONASS, Beidou, Galileo, NAVIC | GPS, GLONASS, Beidou, Galileo |
| NFC* | Yes | Yes |
| Infrared port | Yes | Yes |
| Number of SIM* | 2 | 2 |
| Type of SIM card | Nano | Nano |
| Multi SIM mode | Standby | Standby |
| eSIM support* | No | No |
| Hybrid slot | No | Yes |
| LTE Cat* | 20 | 15 |
| 5G support | Yes | Yes |
Sound
| Speakers | Stereo | Mono |
| Headphone audio jack | No | Yes |
| FM radio | No | Yes |
| Dolby Atmos | Yes | No |
Other
| Category | Flagship | Mid-range |
| Announced | February 2021 | December 2019 |
| Release date | March 2021 | February 2020 |
| SAR (head) | - | 0.47 W/kg |
| SAR (body) | - | 1.16 W/kg |
| Sensors | - Proximity sensor - Gyroscope - Accelerometer - Ambient light sensor - Compass - Fingerprint |
- Barometer - Proximity sensor - Gyroscope - Accelerometer - Ambient light sensor - Compass - Fingerprint |
*Disclaimer! NFC, GSM network support, and some other specs can be different depending on the country.
Conclusion
After analyzing all the data, we think that the Xiaomi Redmi K40 is definitely a better buy.
Cast your vote
Total votes: 23