Side-by-side technical data
Xiaomi Redmi K90 Ultra vs Xiaomi Redmi 9
Comparison between Xiaomi Redmi K90 Ultra and Xiaomi Redmi 9: camera, battery, fast charging, display, performance and colors, side by side. More phones from Xiaomi.
NeoTeo's verdict
Which of the two is the better buy
The Xiaomi Redmi K90 Ultra is the clear pick for anyone seeking a current phone: its 6.83″ AMOLED display, Snapdragon 8 Elite and 100 W charging set it apart from the 2020 Xiaomi Redmi 9, which makes sense only if it costs less.
The display gap is substantial too: the K90 Ultra reaches 9500 nits peak brightness and 447 ppi, versus 400 nits and 269 ppi on the Redmi 9. For performance, the K90 Ultra posts 3,081,184 in AnTuTu and has 16 GB of RAM, against 203,078 and 6 GB; maximum storage is 1 TB versus 128 GB.
The main camera moves from 13 MP and a 1/3.06″ sensor on the Redmi 9 to 50 MP and a 1/1.43″ sensor on the K90 Ultra. Its 8550 mAh battery tops the Redmi 9’s 5000 mAh, and charging is 100 W versus 10 W; the K90 Ultra also supports reverse and reverse wireless charging. The Redmi 9 retains two practical advantages: Google services and expandable storage, both absent from the K90 Ultra.
Xiaomi Redmi K90 Ultra
The Xiaomi Redmi K90 Ultra suits anyone seeking stronger performance, with Snapdragon 8 Elite, 3,081,184 in AnTuTu, and 16 GB of RAM.
Xiaomi Redmi 9
The Xiaomi Redmi 9 is the better buy only if it costs less; it retains Google services and expandable storage.
The verdict
Your pick: Xiaomi Redmi K90 Ultra, ahead on Design & display, Performance & hardware, Camera, Connectivity and Battery & charging.
| Category | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| Design & display | 8.6 | 4.5 |
| Performance & hardware | 9.1 | 2.6 |
| Camera | 7.4 | 4.3 |
| Connectivity | 7.9 | 5.2 |
| Battery & charging | 8.3 | 5.1 |
Which one is for you?
Xiaomi Redmi K90 Ultra, if you care about…
- Battery Capacity
- 8,550 mAh
- against 5,000 mAh
- AnTuTu Score
- 3,081,184
- against 203,078
- RAM Capacity
- 16 GB
- against 6 GB
- Wi-Fi Standards
- Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax), Wi-Fi 7 (802.11be), Wi-Fi 802.11a/b/g
- against Wi-Fi 802.11a/b/g/n, Wi-Fi 5 (802.11ac)
Xiaomi Redmi 9, if you care about…
- Weight
- 194 g
- against 227 g
- Expandable Storage
- Yes
- against No
- Google Services
- Yes
- against No
Specification comparison
Performance
| Specification | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| Processor Model | Qualcomm Snapdragon 8 Elite | MediaTek Helio G35 |
| Processor Process Size | 3 nm Best value | 12 nm |
| Graphics GPU | Qualcomm Adreno 830 | PowerVR GE8320 |
| Storage Type | UFS 4.1 Best value | eMMC 5.1 |
| Maximum CPU Clock | 4.32 GHz Best value | 2.3 GHz |
| Maximum Storage Capacity | 1 TB Best value | 128 GB |
| AnTuTu Score | 3,081,184 Best value | 203,078 |
| Geekbench 6 Single-Core | 3,234 Best value | 189 |
| Geekbench 6 Multi-Core | 10,059 Best value | 810 |
| CPU Description | Octa-core CPU with 2x4.32 GHz and 6x3.53 GHz cores | Octa-core CPU with four Cortex-A53 cores at 2.3 GHz and four Cortex-A53 cores at 1.8 GHz |
| Processor Type | Octa-Core | Octa-Core |
| 64-Bit Processor | Yes | Yes |
| RAM Capacity | 16 GB Best value | 6 GB |
| RAM Type | LPDDR5X Best value | LPDDR4X |
| Expandable Storage | No | Yes Best value |
| AnTuTu version | v11 | v8 |
Design
| Specification | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| Body Colors | Black, Blue, Silver | Black, Blue, Orange, Green, Cyan |
| Body Thickness | 8.2 mm Best value | 9 mm |
| Body Width | 77.9 mm | 77.1 mm |
| Body Height | 162.9 mm | 164.9 mm |
| Weight | 227 g | 194 g Best value |
| Usable Surface | 90.3 % Best value | 81 % |
| Body Materials | Glass, Aluminium Alloy Best value | Plastic, Splash Resistant |
| Resistance Features | IP68, IP69, IP66 | Water Resistant |
| Waterproof Depth | 1.5 m | — |
Battery
| Specification | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| Battery Capacity | 8,550 mAh Best value | 5,000 mAh |
| Battery Type | Si-Carbon Li-Ion Best value | Li-Polymer |
| Fast Charge Power | 100 W Best value | 10 W |
| Battery Features | Non-Removable, Fast Charging, Reverse Charging, Reverse Wireless Charging, Rechargeable, Battery Level Indicator Best value | Non-Removable, Rechargeable, Fast Charging, Battery Level Indicator |
| Reverse wireless charging power | 22.5 W | — |
Display
| Specification | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| Display Aspect Ratio | 19.5:9 | 20:9 |
| Display Technology | AMOLED Best value | IPS LCD |
| Peak Display Brightness | 9,500 nits Best value | 400 nits |
| Display Diagonal | 6.83″ Best value | 6.53″ |
| Display Horizontal Resolution | 1,280 px Best value | 720 px |
| Display Vertical Resolution | 2,772 px Best value | 1,600 px |
| Display Pixel Density | 447 ppi Best value | 269 ppi |
| Display Refresh Rate | 165 Hz | — |
| Touch Sampling Rate | 480 Hz | — |
| Display Contrast Ratio | 8,000,000 :1 Best value | 1,500 :1 |
| Display Features | Hole-Punch Notch, HDR10, HDR10+, Dolby Vision, Always-On Display, Capacitive Touch, Multi-Touch, Gorilla Glass, DC Dimming, DCI-P3, TÜV Rheinland Low Blue Light, TÜV Rheinland Flicker-Free Certified, TÜV Rheinland Eye Comfort Certification, Scratch Resistant, Frameless | Water Drop Notch, TÜV Rheinland Eye Comfort Certification, Scratch Resistant, Gorilla Glass 3, Curved Glass, Capacitive Touch, Multi-Touch, Frameless, Touchscreen |
Sensors
| Specification | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| Fingerprint Sensor Placement | Under Display | Rear |
Sensor
| Specification | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| Sensor Features | Fingerprint Sensor, Accelerometer, Proximity Sensor, Gyroscope, Compass, Hall Sensor, Light Sensor, RGB Sensor, Cooling System | Fingerprint Sensor, Accelerometer, Proximity Sensor, Compass, Light Sensor, Virtual Proximity Sensing |
Software
| Specification | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| Operating System | Android 16 | Android 10 |
| OS Family | Android | Android |
| OS Version | 16 Best value | 10 |
| Google Services | No | Yes Best value |
Connectivity
| Specification | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| SIM Configurations | Dual Nano-SIM, Dual SIM Dual Standby | Dual Nano-SIM, Dual SIM Dual Standby |
| Cellular Bands | 2G GSM 850, 2G GSM 900, 2G GSM 1800, 2G GSM 1900, 3G UMTS B1, 3G UMTS B2, 3G UMTS B3, 3G UMTS B4, 3G UMTS B5, 3G UMTS B6, 3G UMTS B8, 3G UMTS B19, 4G LTE B1, 4G LTE B3, 4G LTE B4, 4G LTE B5, 4G LTE B7, 4G LTE B8, 4G LTE B19, 4G LTE B28A, 4G LTE B34, 4G LTE B38, 4G LTE B39, 4G LTE B40, 4G LTE B41, 4G LTE B42, 4G LTE B48, 4G LTE B66, 5G NR n1, 5G NR n3, 5G NR n5, 5G NR n7, 5G NR n8, 5G NR n28a, 5G NR n38, 5G NR n40, 5G NR n41, 5G NR n48, 5G NR n66, 5G NR n77, 5G NR n78 | 2G GSM 850, 2G GSM 900, 2G GSM 1800, 2G GSM 1900, 3G UMTS B1, 3G UMTS B2, 3G UMTS B3, 3G UMTS B4, 3G UMTS B5, 3G UMTS B8, 4G LTE B1, 4G LTE B2, 4G LTE B3, 4G LTE B4, 4G LTE B5, 4G LTE B7, 4G LTE B8, 4G LTE B20, 4G LTE B28A, 4G LTE B28B, 4G LTE B38, 4G LTE B40, 4G LTE B41 |
| Cellular Technologies | GSM, HSPA, LTE, 5G Best value | GSM, HSPA, UMTS, LTE, 4G |
| Wi-Fi Standards | Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax), Wi-Fi 7 (802.11be), Wi-Fi 802.11a/b/g Best value | Wi-Fi 802.11a/b/g/n, Wi-Fi 5 (802.11ac) |
| Wi-Fi Features | Dual Band, Wi-Fi Hotspot, Wi-Fi Direct, Wi-Fi Display, MIMO | Wi-Fi Hotspot, Wi-Fi Direct, Wi-Fi Display |
| Bluetooth Version | Bluetooth 5.4 Best value | Bluetooth 5.0 |
| Bluetooth Profiles | A2DP, LE, LHDC 5.0, ASHA, Auracast | A2DP, LE |
| Navigation Systems | GPS, A-GPS, GLONASS, BeiDou, Galileo, QZSS, NavIC Best value | GPS, A-GPS, GLONASS, BeiDou |
| Connectivity Features | USB Charging, USB Mass Storage, USB OTG, USB Type-C, NFC, Computer Sync, OTA Sync, Tethering, Infrared, VoLTE | 3.5 mm Audio Jack, FM Radio, Computer Sync, Infrared, NFC, OTA Sync, Tethering, VoLTE, USB Charging, USB Mass Storage |
| USB Version | USB 3.2 | microUSB |
| SAR American Head | — | 0.51 W/kg |
| SAR American Body | — | 0.83 W/kg |
| SAR (EU) head | — | 0.789 W/kg |
| SAR (EU) body | — | 1.065 W/kg |
| Max. download speed | 10,000 Mbps Best value | 300 Mbps |
| Max. upload speed | 3,500 Mbps Best value | 150 Mbps |
Audio
| Specification | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| Microphone Count | — | 2 |
| Audio Features | Stereo Speakers, Dolby Atmos, Hi-Res Audio, Hi-Res Wireless Audio, A2DP, LE, LHDC 5, ASHA, Auracast Best value | A2DP, LE, Loudspeaker, Noise-Cancellation Microphone |
Technical
| Specification | Redmi K90 Ultra | Redmi 9 |
|---|---|---|
| Model numbers | 2604FRK1EC | M2004C3MI |
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