Xiaomi Redmi K90

The Xiaomi Redmi K90 has a non-folding, non-rugged form factor measuring 157.5 mm tall, 75.3 mm wide, and just 8 mm thick, with a total volume of 94.878 cm³ and a weight of 206 g. It carries an IP68 rating, confirming full waterproof protection at depths of up to 1.5 meters.

The Xiaomi Redmi K90 features a 6.59″ OLED/AMOLED touchscreen with a resolution of 1156 x 2510 px and a pixel density of 419 ppi, backed by a 3500-nit peak brightness and a 120Hz refresh rate for smooth on-screen motion. The panel supports a 480Hz touch sampling rate, Always-On Display, and is protected by branded damage-resistant glass. On the content side, it is fully compatible with HDR10, HDR10+, and Dolby Vision, covering a broad range of high dynamic range formats. There is no secondary screen.

The Xiaomi Redmi K90 is driven by the Qualcomm Snapdragon 8 Elite, a 3nm chipset configured with 8 threads across two cores at 4.32 GHz and six cores at 3.53 GHz, using big.LITTLE architecture with HMP support and a TDP of 8.2W. It is paired with 16GB of DDR5 RAM running at 5300 MHz — expandable up to 24GB — across two memory channels delivering a maximum bandwidth of 85.1 GB/s, alongside 1024GB of internal storage. The Adreno 830 GPU clocks at 1100 MHz with 1536 shading units and supports DirectX 12, OpenGL 3.2, OpenGL ES 3.2, and OpenCL 3, with integrated graphics capable of driving up to two displays. The chipset also includes integrated LTE, TrustZone security, ECC memory support, multithreading, and a cache hierarchy comprising 192 KB L1, 12 MB L2, and 8 MB L3. Geekbench 6 results stand at 3234 single-core and 10059 multi-core.

The Xiaomi Redmi K90 uses a multi-lens rear camera system with three sensors rated at 50, 50, and 8 megapixels, with apertures of f/1.9, f/2.2, and f/2.2 respectively, covering a focal range of 15 mm to 60 mm and offering 2.5x optical zoom. Video recording reaches up to 4320 x 30 fps, with slow-motion and timelapse modes also available, though HDR10 and Dolby Vision recording are not supported. Autofocus options include phase-detection, laser, touch, and continuous autofocus during video, while manual controls extend to exposure, ISO, focus, and white balance — though manual shutter speed is absent. The camera also supports burst mode, HDR, RAW capture, and in-camera panoramas, but does not shoot 360-degree panoramas or 3D content. Illumination is handled by a dual-tone LED flash with two LEDs, while no optical image stabilization, BSI sensor, or CMOS sensor is present. The 20MP front camera is a single-lens unit without an under-display placement or a front-facing flash.

The Xiaomi Redmi K90 runs Android 16, a free and open-source platform that supports multi-user profiles, split-screen multitasking, Picture-in-Picture, widgets, sharing intents, and the ability to play games while they download. Privacy tools cover clipboard warnings, location controls, and camera/microphone access management, along with app tracking blocking, though cross-site tracking protection and Mail Privacy Protection are absent. Personalization options include theme customization, dynamic theming, dark mode, and an extra dim mode, while productivity is aided by full-page scrolling screenshots, a media picker, Live Text, customizable notifications, offline voice recognition, voice commands, and on-device machine learning. The device also offers a battery health check, app offloading, child lock, and phone tracking, but does not support Wi-Fi password sharing, focus modes, Quick Start, or PC desktop mode. Direct OS updates from the vendor are not available on this model.

The Xiaomi Redmi K90 houses a rechargeable 7100 mAh battery with a built-in level indicator, and while it does not support standard wireless charging, it does offer reverse wireless charging at 22.5W, allowing it to share power with other devices. Wired fast charging is supported at 100W, enabling rapid top-ups over cable. The battery is non-removable.

The Xiaomi Redmi K90 includes stereo speakers but lacks a 3.5mm headphone jack and has no built-in radio. On the wireless audio side, none of the high-quality Bluetooth codecs are supported — aptX, aptX HD, aptX Adaptive, aptX Lossless, and LDAC are all absent.

The Xiaomi Redmi K90 supports 5G cellular connectivity alongside dual SIM card slots, and its wireless capabilities span Wi-Fi 4, 5, 6, and 7, covering a wide range of network standards. Bluetooth 5.4 and NFC are both present, while the USB Type-C port runs at USB 3.2 and supports download speeds of up to 10,000 Mbit/s and upload speeds of up to 3,500 Mbit/s. There is no external memory slot, HDMI output, or DLNA certification. Onboard sensors include a gyroscope, accelerometer, compass, GPS with Galileo support, infrared sensor, and a fingerprint scanner, though there is no barometer, heart rate monitor, ANT+ support, or 3D facial recognition. Features such as crash detection, satellite SOS, an iris scanner, motion or optical tracking, and a built-in projector are also absent, and no stylus is included.

The Xiaomi Redmi K90 includes a video light for recording in low-light conditions, but its display is flat rather than curved and uses neither sapphire glass nor an e-paper panel.