Xiaomi has released the Redmi K90 Ultra in China. It is a new smartphone that stands out primarily for including a built-in active cooling fan alongside a Snapdragon 8 Elite processor.
Redmi K90 Ultra Specifications
The phone has a 6.83-inch flat AMOLED screen. It runs at a 1.5K resolution (2772 × 1280) and has a 165Hz refresh rate. Xiaomi is using M10 display material here, which the company says can hit a peak brightness of 3,500 nits. For touch input, the screen registers a 480Hz multi-finger reporting rate and a 3,500Hz instant touch sampling rate to reduce input lag.
Inside, the Redmi K90 Ultra runs on the Snapdragon 8 Elite, a 3nm chip. Xiaomi paired this with up to 16GB of LPDDR5X RAM and 512GB of UFS 4.1 storage. There is also a secondary D2 display chip designed to handle AI upscaling and frame interpolation for games.
To keep the hardware cool, Xiaomi added an active air-cooling system. It uses an 18.1mm fan that operates at a reported 32dB, working alongside a 6,000mm² vapor chamber to move heat away from the processor. The device ships with Xiaomi’s HyperOS 3 operating system.
The camera system is relatively straightforward. The main rear camera uses a 50-megapixel Light Hunter 800 sensor (1/1.55-inch) with an f/1.68 aperture and OIS. There is also an 8-megapixel ultra-wide lens. The rear setup can record video at up to 8K at 30fps. On the front, there is a 20-megapixel camera for selfies and 1080p video.
Under the hood, the phone is equipped with a large 8,550mAh battery. It supports 100W wired fast charging, 22.5W wired reverse charging, and bypass charging.
The handset carries IP66, IP68, and IP69 ratings for dust and water resistance, while the cooling fan module is independently rated at IPX8 and IPX9. Additionally, the device includes dual stereo speakers tuned by Bose, a 3D ultrasonic fingerprint scanner, an X-axis linear motor for haptics, Wi-Fi 7, and Bluetooth 5.4.
Pricing and Availability
The Redmi K90 Ultra is available now in China. It comes in Shadow Black, Space Silver, and Sky Blue. The base model with 12GB of RAM and 256GB of storage starts at 2,799 yuan ($420). Xiaomi is also offering the 16GB + 256GB variant at the same 2,799 yuan ($420) introductory price. The 12GB + 512GB model is priced at 3,299 yuan ($495), while the top-end 16GB + 512GB configuration retails for 3,499 yuan ($525).
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