Xiaomi Redmi K90 (256GB / 12GB RAM)

The Xiaomi Redmi K90 has a non-folding, non-rugged design that measures 157.5 mm tall, 75.3 mm wide, and 8 mm thick, resulting in a volume of 94.878 cm³ and a weight of 206 g. It carries an IP68 ingress protection rating, classifying it as waterproof with a rated submersion depth of 1.5 m, offering reliable protection against water in everyday situations.

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 branded damage-resistant glass and an Always-On Display mode. The panel runs at a 120Hz refresh rate with a 480Hz touch sampling rate, and reaches a typical brightness of 3500 nits. It supports HDR10, HDR10+, and Dolby Vision for wide-format content compatibility, though there is no secondary screen.

The Xiaomi Redmi K90 is powered by the Qualcomm Snapdragon 8 Elite, a 3 nm SoC with an 8-thread CPU configuration running at 2 x 4.32 GHz and 6 x 3.53 GHz using big.LITTLE and HMP scheduling, alongside an Adreno 830 GPU clocked at 1100 MHz with 1536 shading units and support for up to 2 displays. The chipset supports 64-bit processing, TrustZone, multithreading, integrated LTE, and integrated graphics, and is rated at a TDP of 8.2W. The device ships with 12 GB of DDR5 RAM running at 5300 MHz across 2 memory channels, a maximum memory bandwidth of 85.1 GB/s, ECC memory support, and a maximum memory capacity of 24 GB, paired with 256 GB of internal storage. Cache configuration includes 192 KB L1, 12 MB L2, and 8 MB L3, while graphics API support spans DirectX 12, OpenGL 3.2, OpenGL ES 3.2, and OpenCL 3. Geekbench 6 scores reach 3234 single-core and 10059 multi-core.

The Xiaomi Redmi K90 features a multi-lens rear camera system with three sensors rated at 50 MP (f/1.9), 50 MP (f/2.2), and 8 MP (f/2.2), covering a focal range from 15 mm to 60 mm and offering 2.5x optical zoom. Video recording reaches 4320 x 30 fps (8K), with support for slow-motion recording, continuous autofocus during video, and a dual-tone LED flash using two LEDs — though HDR10 and Dolby Vision recording are not available. On the autofocus side, the system includes phase-detection, laser, and touch autofocus for photos, while manual controls cover exposure, ISO, focus, and white balance, and the camera also shoots in RAW format; manual shutter speed, however, is not supported. Additional shooting modes include burst, panorama, and timelapse, while 360° panorama and 3D recording are absent. The 20 MP front camera is a single-lens unit without a front-facing flash and is not positioned under the display.

The Xiaomi Redmi K90 runs Android 16, a free and open-source platform that supports multi-user access, widgets, split-screen multitasking, Picture-in-Picture, sharing intents, full-page screenshots, a media picker, and the ability to play games while they are still downloading. Customization options include dark mode, dynamic theming, theme customization, and customizable notifications with full notification permission controls. Privacy features cover clipboard warnings, location privacy options, camera and microphone access controls, and app tracking blocking, though Mail Privacy Protection and cross-site tracking blocking are not available. The OS also includes on-device machine learning, offline voice recognition, voice commands, Live Text, an extra dim mode, a battery health check, a child lock, app offloading, and device position tracking. Direct OS updates from the vendor are not supported, and Quick Start and focus modes are absent.

The Xiaomi Redmi K90 is equipped with a 7100 mAh rechargeable, non-removable battery with a visible battery level indicator. It supports fast wired charging at 100W, though standard wireless charging is not available. The device does, however, offer reverse wireless charging at 22.5W, allowing it to wirelessly charge other compatible devices.

The Xiaomi Redmi K90 includes stereo speakers but omits a 3.5 mm headphone jack and has no built-in radio. On the Bluetooth audio codec side, none of the advanced wireless formats — aptX, aptX HD, aptX Adaptive, aptX Lossless, or LDAC — are supported.

The Xiaomi Redmi K90 supports 5G cellular connectivity alongside a dual-SIM configuration, and its wireless networking covers Wi-Fi 4, 5, 6, and 7, delivering download speeds of up to 10000 MBits/s and upload speeds of up to 3500 MBits/s. Bluetooth 5.4 and NFC are both present, while the USB Type-C port runs on USB 3.2. There is no external memory slot, no HDMI output, and no DLNA certification. Onboard sensors include a gyroscope, accelerometer, compass, GPS with Galileo support, and an infrared sensor, though a barometer, heart rate monitor, and ANT+ support are absent. Security is handled through a fingerprint scanner; 3D facial recognition, an iris scanner, and a stylus are not included. Crash detection, emergency SOS via satellite, motion tracking, optical tracking, and a built-in projector are likewise not featured.

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