Xiaomi Redmi K90 vs Xiaomi Redmi K40 Ultra
Quick Comparison
Xiaomi Redmi K90 has better RAM than Xiaomi Redmi K40 Ultra. In terms of display resolution, Xiaomi Redmi K90 has better resolution of 3200 x 1440 than Xiaomi Redmi K40 Ultra which has resolution of 2400 x 1080. Xiaomi Redmi K90 has more internal memory than Xiaomi Redmi K40 Ultra
| Name | Xiaomi Redmi K90 | Xiaomi Redmi K40 Ultra |
| RAM | 12 GB | 8 GB |
|---|---|---|
| Display | 6.8 in | 6.67 in |
| Internal Memory | 256 GB | 128 GB |
| Battery | 5500 mAh | 5065 mAh |
| Camera | 50 MP + 13 MP + 2 MP Triple | 64 MP + 8 MP + 2 MP Triple |
| Price | Rs. 46990 | Rs. 29990 |
Related Products
Detailed Comparison
Price And Launch
The launch Date of the first phone is expected to be August 27, 2025 (Expected). The cost of Xiaomi Redmi K90 is Rs. 46990. The cost of Xiaomi Redmi K40 Ultra is Rs. 29990.
Display comparison
Xiaomi Redmi K40 Ultra has screen size of 6.67 inches which falls short to Xiaomi Redmi K90's 6.8 inch screen. Xiaomi Redmi K90 has AMOLED Screen type where as Xiaomi Redmi K40 Ultra has OLED Screen type. Xiaomi Redmi K90 has display density of 516 PPI & Xiaomi Redmi K40 Ultra has only 395 PPI display density. In terms of screen to body ratio, Xiaomi Redmi K90 has better screen to body ratio of ~ 87.5% than Xiaomi Redmi K40 Ultra's ~ 86.3%. Both mobiles have same aspect ratio of 20:9.
Memory comparison
Xiaomi Redmi K90's larger 12 GB RAM is better for playing games and all with respect to Xiaomi Redmi K40 Ultra's lower 8 GB RAM. Xiaomi Redmi K90 has more Internal Memory (256 GB) than Xiaomi Redmi K40 Ultra (128 GB).
Camera comparison
Xiaomi Redmi K40 Ultra's 64 MP + 8 MP + 2 MP Triple Rear Camera outclasses Xiaomi Redmi K90's 50 MP + 13 MP + 2 MP Triple Rear Camera in terms of resolution. Xiaomi Redmi K90 will be better choice if you're looking to click lot of selfies as it has better 32 MP Front Camera in comparison to Xiaomi Redmi K40 Ultra's 16 MP Front Camera.
Technical comparison
Both the phones has Android Operating System but the first one runs on version 14 and the second one on 11 version.
Related Comparisons
Full Comparison
| Name | Xiaomi Redmi K90 | Xiaomi Redmi K40 Ultra |
| General | ||
| Model | K90 | K40 Ultra |
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM |
| Dual Sim | Yes | Yes |
| Sim Size | Nano+Nano SIM | Nano+Nano SIM |
| Device Type | Smartphone | Smartphone |
| Release Date | August 27, 2025 (Expected) | |
| Display | ||
| Type | Color AMOLED Screen (1B Colors) | Color OLED Screen (16M Colors) |
| Touch | Yes, 580 Hz Touch Sampling Rate | Yes |
| Size | 6.8 inches, 1440 x 3200 pixels, 144 Hz | 6.67 inches, 1080 x 2400 pixels, 120 Hz |
| Aspect Ratio | 20:9 | 20:9 |
| PPI | ~ 516 PPI | ~ 395 PPI |
| Screen to Body Ratio | ~ 87.5% | ~ 86.3% |
| Features | 2440Hz High-frequency PWM dimming, HDR10+, HDR Vivid, 3000nits | |
| Notch | Yes, Punch Hole | Yes, Punch Hole |
| Memory | ||
| RAM | 12 GB | 8 GB |
| Storage | 256 GB | 128 GB |
| Storage Type | UFS 4 | |
| Card Slot | No | |
| Connectivity | ||
| GPRS | Yes | Yes |
| EDGE | Yes | Yes |
| 3G | Yes | Yes |
| 4G | Yes | Yes |
| 5G | Yes | Yes |
| 5G Bands | n1/n3/n5/n8/n28a/n38/n41/n77/n78 | |
| VoLTE | Yes | Yes, Dual Stand-By |
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot |
| Wifi Version | Wi-Fi 7 | |
| Bluetooth | Yes, v5.4, A2DP, LE | Yes, v5.2 |
| USB | Yes, USB-C v2.0 | Yes, USB-C |
| USB Features | USB on-the-go, USB Charging | USB Tethering, USB on-the-go, USB Charging |
| IR Blaster | Yes | |
| Extra | ||
| GPS | Yes, with A-GPS. Up to tri-band: GLONASS, BDS, GALILEO, QZSS, NavIC | Yes with A-GPS, Glonass |
| Fingerprint Sensor | Yes, In Display | Yes, In Display |
| Face Unlock | Yes | Yes |
| Sensors | Accelerometer, Gyro, Proximity, Compass, Color Spectrum | |
| 3.5mm Headphone Jack | No | USB Type-C |
| NFC | Yes | |
| Splash Resistant | Yes | |
| Dust Resistant | No | Yes |
| Camera | ||
| Rear Camera | 50 MP ƒ/1.9 (Wide Angle) 13 MP (Ultra Wide) 2 MP ƒ/2.4 (Macro) macro | 64 MP ƒ/1.7-ƒ/2.4 8 MP 2 MP |
| OIS | Yes | Yes |
| Auto Focus | Yes | Yes |
| Features | HDR, panorama | Digital Zoom, Auto Flash, Face detection, Touch to focus |
| Video Recording | 8K @ 24 fps UHD, 4K @ 30/60 fps UHD, 1080p @ 30/60 fps FHD, 720p @ 1920 fps HD | 1080p @ 30 fps FHD |
| Flash | Yes, Dual LED | Yes, LED |
| Front Camera | 32 MP (Wide Angle) Punch Hole | 16 MP Primary Camera Punch Hole, Screen Flash |
| Front Video Recording | 1080p @ 30 fps FHD | 1080p @ 30 fps FHD |
| Technical | ||
| OS | Android v14 | Android v11 |
| Custom UI | HyperOS | |
| Chipset | Qualcomm Snapdragon 8 Gen4 | MediaTek Dimensity 1200 |
| CPU | Octa Core Processor | 3 GHz, Octa Core Processor |
| Core Details | 1x3.0 GHz Cortex-A78 & 3x2.6 GHz Cortex-A78 & 4x2.0 GHz Cortex-A55 | |
| GPU | Mali-G77 MC9 | |
| Java | No | No |
| Browser | Yes | Yes |
| Multimedia | ||
| Yes | Yes | |
| Music | Yes | Yes |
| Video | Yes | Yes |
| FM Radio | No | Yes |
| Document Reader | Yes | Yes |
| Battery | ||
| Type | Non-Removable Battery | Non-Removable Battery |
| Size | 5500 mAh, Li-Po Battery | 5065 mAh, Li-Po Battery |
| Fast Charging | Yes, 150W Fast charging | Yes, 67W Fast Charging |
| Wireless Charging | Yes, 50W | |