Xiaomi just announced the Redmi K90 Max in China, and this year, the headline feature isn’t just the chipset or the battery. It’s the fan. This is the first Xiaomi phone to ship with a built-in active cooling system, and it’s going all-in on the idea.
The fan measures 18.1mm in diameter, which Xiaomi says is larger than most implementations. It uses a vertical air intake with forward-leaning blades to push airflow more efficiently, alongside a sealed air duct and a vortex-style airflow design meant to reduce turbulence.
According to Xiaomi’s internal testing, the system can drop temperatures by up to 10°C in around 100 seconds. There are three adjustable fan modes, with noise levels topping out at 32dB.
The fan itself uses an all-metal bearing system and has reportedly passed a 50,000-hour aging test. More impressively, Xiaomi says buyers who pick up the device before May 5 will get a six-year warranty on the fan, along with lifetime free cleaning.
Redmi K90 Max is a performance-first phone
Inside, the phone runs on the MediaTek Dimensity 9500 chipset, paired with an AI-focused discrete graphics chip called the D2. The combination is designed for high refresh rate gaming, with support for 1.5K resolution at up to 165Hz across a wide range of titles.
It also uses the latest LPDDR5X Ultra RAM and UFS 4.1 memory standards, as you would expect from a performance-focused device.
Up front, there’s a 6.83-inch flat display with a 1.5K resolution and a 165Hz refresh rate. Xiaomi says it uses M10 backlight technology and supports full-brightness DC dimming, along with a low 1-nit brightness mode and a dedicated eye protection setting for gaming.
Keeping everything running is a large 8,550mAh single-cell battery with support for 100W wired charging.
Cameras and extras
Things are relatively simple on the camera side. The rear setup is led by a 50-megapixel main sensor (1/1.55-inch), paired with an 8MP ultrawide lens. On the front, there’s a 20MP selfie camera.
There are also a few gaming-focused additions, including a 400Hz gyroscope sampling rate, optimized touch zones for certain games, and a three-microphone system designed to work better in landscape orientation. Xiaomi has also included two Surge T1+ signal enhancement chips to improve network stability.
Other hardware details include symmetrical dual speakers tuned with Bose, a 3D ultrasonic fingerprint sensor, and an X-axis linear motor for haptics. The phone also carries IP66, IP68, and IP69 ratings for dust and water resistance, which is notable given the presence of an internal fan.
Price and Availability
The Redmi K90 Max starts at 3,499 yuan (~ $513)in China. A limited-time initial sale discount alongside the national subsidy effectively brings the price down to 2549 yuan (~ $373); however, we are listing the original price below:
| Redmi K90 Ultra | China Price (CNY) | Price (USD, approx.) |
| 12GB / 256GB | 3,499 | $513 |
| 12GB / 512GB | 3,999 | $586 |
| 16GB / 256GB | 3,799 | $557 |
| 16GB / 512GB | 4,299 | $630 |
| 16GB / 1TB | 4,999 | $733 |
It’s available in three finishes: Space Silver, Shadow Black, and Sky Blue, all wrapped in an aluminum alloy frame with slim bezels and a fairly minimal design.
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