Xiaomi has turned a gaming phone into a small thermal experiment. The new Redmi K90 Max launches in China with a built-in fan, an 8550 mAh battery, and a spec sheet aimed squarely at people who think ”good enough” frame rates are for other people.
That cooling setup matters because this is Xiaomi’s first smartphone with active fan cooling, and it arrives in a category where makers keep piling on bigger batteries, faster chips, and ever-brighter displays in the hope that heat somehow won’t notice. It always notices.
Xiaomi’s first phone with active fan cooling
The fan inside the Redmi K90 Max measures 18.1 mm across, and Xiaomi says that is larger than most comparable systems. The design uses a vertical air intake, forward-tilted blades, a sealed airflow channel, a vortex structure to reduce turbulence, and a full-metal bearing system. In other words: a lot of engineering to keep a gaming phone from cooking itself alive.
Xiaomi says the cooling system can drop the device temperature by up to 10 C in about 100 seconds. There are three fan modes, noise is capped at 32 dB, and the fan has been tested for 50,000 hours of ageing. Buyers who get the phone before 5 May also get a six-year fan warranty and free lifetime cleaning of the cooling system.
Dimensity 9500, D2 graphics and 165 Hz gaming
Under the hood, Redmi K90 Max uses MediaTek’s 3 nm Dimensity 9500, paired with a discrete D2 graphics chip focused on AI. Xiaomi says the combination supports 1.5K gaming at up to 165 Hz across a wide range of games, which is the kind of number that looks very nice in a launch presentation and very mean on a benchmark chart.
- Up to 16 GB LPDDR5X Ultra RAM
- Up to 1 TB UFS 4.1 storage
- 6.83-inch AMOLED M10 display
- 1.5K resolution, 2608 × 1200 pixels
- 165 Hz refresh rate
The screen also supports DC Dimming, a low-brightness mode down to 1 cd/m2, and a special eye-protection setting for games. An ultrasonic 3D fingerprint sensor sits under the display.
Redmi K90 Max battery, cameras and price
The battery is the headline that would normally steal the show in almost any other phone: 8550 mAh, with 100 W wired charging and 22.5 W reverse charging. That puts Redmi K90 Max in the same broad ”carry a charger if you want, but you probably won’t need to” territory as the most aggressive battery-first flagships.
For cameras, Xiaomi added a 50-megapixel main sensor, Light Fusion 800, with optical image stabilisation, plus an 8-megapixel ultrawide camera. Up front is a 20-megapixel selfie camera. There are also 400 Hz gyroscope sampling, tuned touch zones for certain games, a three-microphone array for better landscape use, two Surge T1+ chips for wireless signal quality, and stereo speakers with Dolby Atmos and Bose tuning. Protection is rated IP66, IP68, and IP69.
Pricing starts at $513 for the 12/256 GB version and rises to $733 for the model with 16 GB of RAM and 1 TB of storage. That is not cheap, but Xiaomi is clearly betting that gamers would rather pay for sustained performance than watch a flagship throttle itself into mediocrity.
The bigger question is whether the built-in fan becomes a genuine selling point or just another clever spec that other Android brands copy badly six months later. Given how hard gaming phones now chase console-style performance, active cooling feels less like a gimmick and more like the next obvious arms race.