Screen size
Redmi K40 Pro+6.7"
Redmi K90 MaxWinner: 6.8"+2.3%
Quick verdict
Redmi K90 Max leads the measured specs 9-6.
Measured wins
Redmi K40 Pro+
6
spec wins
Ties
8
equal specs
Redmi K90 Max
9
spec wins
Overall winner
Screen size
Technology
Redmi K40 Pro+
GSM / CDMA / HSPA / CDMA2000 / LTE / 5G
Redmi K90 Max
GSM / HSPA / LTE / 5G
2G bands
Redmi K40 Pro+
GSM 850 / 900 / 1800 / 1900 , CDMA 800
Redmi K90 Max
GSM 850 / 900 / 1800 / 1900
3G bands
Redmi K40 Pro+
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 , CDMA2000 1x
Redmi K90 Max
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands
Redmi K40 Pro+
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
equal specsStorage
equal specsMain camera
Front camera
equal specsBattery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
equal specs1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 34, 38, 39, 40, 41, 42
Redmi K90 Max
1, 3, 4, 5, 7, 8, 19, 28, 34, 38, 39, 40, 41, 42, 43, 48, 66
5G bands
Redmi K40 Pro+
1, 3, 28, 41, 77, 78 SA/NSA/Sub6
Redmi K90 Max
1, 3, 5, 7, 8, 28, 34, 38, 39, 40, 41, 48, 77, 78 SA/NSA
Speed
Redmi K40 Pro+
HSPA, LTE, 5G
Redmi K90 Max
HSPA, LTE, 5G
Announced
Redmi K40 Pro+
2021, February 25
Redmi K90 Max
2026, April 21
Status
Redmi K40 Pro+
Available. Released 2021, March 04
Redmi K90 Max
Available. Released 2026, April 21
Dimensions
Redmi K40 Pro+
163.7 x 76.4 x 7.8 mm (6.44 x 3.01 x 0.31 in)
Redmi K90 Max
162.9 x 77.9 x 8.2 mm (6.41 x 3.07 x 0.32 in)
Weight
Redmi K40 Pro+
196 g (6.91 oz)
Redmi K90 Max
227 g (8.01 oz)
SIM
Redmi K40 Pro+
Nano-SIM + Nano-SIM
Redmi K90 Max
Nano-SIM + Nano-SIM
Other
Redmi K40 Pro+
IP53 dust protected and water resistant (vertical water sprays)
Redmi K90 Max
IP68/IP69 dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min) Built-in cooling fan
Build
Redmi K40 Pro+
-
Redmi K90 Max
Glass front (Dragon Crystal Glass), aluminum frame, glass-fiber reinforced plastic back or silicone polymer back
Type
Redmi K40 Pro+
Super AMOLED, 120Hz, HDR10+, 1300 nits (peak)
Redmi K90 Max
AMOLED, 68B colors, 165Hz, Dolby Vision, HDR10+, HDR Vivid, 3500 nits (peak)
Size
Redmi K40 Pro+
6.67 inches, 107.4 cm2 (~85.9% screen-to-body ratio)
Redmi K90 Max
6.83 inches, 114.5 cm2 (~90.3% screen-to-body ratio)
Resolution
Redmi K40 Pro+
1080 x 2400 pixels, 20:9 ratio (~395 ppi density)
Redmi K90 Max
1280 x 2772 pixels, 19.5:9 ratio (~447 ppi density)
Protection
Redmi K40 Pro+
Corning Gorilla Glass 5
Redmi K90 Max
Dragon Crystal Glass
OS
Redmi K40 Pro+
Android 11, MIUI 12
Redmi K90 Max
Android 16, HyperOS 3
Chipset
Redmi K40 Pro+
Qualcomm SM8350 Snapdragon 888 5G (5 nm)
Redmi K90 Max
MediaTek Dimensity 9500 (3 nm)
CPU
Redmi K40 Pro+
Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55)
Redmi K90 Max
Octa-core (1x4.21 GHz C1-Ultra & 3x3.5 GHz C1-Premium & 4x2.7 GHz C1-Pro)
GPU
Redmi K40 Pro+
Adreno 660
Redmi K90 Max
Mali-G1 Ultra MC12
Card slot
Redmi K40 Pro+
No
Redmi K90 Max
No
Internal
Redmi K40 Pro+
256GB 12GB RAM
Redmi K90 Max
256GB 12GB RAM, 256GB 16GB RAM, 512GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM
Other
Redmi K40 Pro+
UFS 3.1
Redmi K90 Max
UFS 4.1
Triple
Redmi K40 Pro+
108 MP, f/1.8, 26mm (wide), 1/1.52", 0.7µm, PDAF 8 MP, f/2.2, 119˚ (ultrawide) 5 MP, f/2.4, 50mm (macro)
Redmi K90 Max
-
Features
Redmi K40 Pro+
Color spectrum sensor, LED flash, HDR, panorama
Redmi K90 Max
LED flash, HDR, panorama
Video
Redmi K40 Pro+
8K@30fps, 4K@30/60fps, 1080p@30/60/120/240/960fps, gyro-EIS, HDR10+
Redmi K90 Max
8K@30fps, 4K@30/60fps, 1080p@30/60/120/240/960fps, gyro-EIS
Dual
Redmi K40 Pro+
-
Redmi K90 Max
50 MP, f/1.7, 24mm (wide), 1/1.55", 1.0µm, PDAF, OIS 8 MP, f/2.2, (ultrawide), 1/4.0", 1.12µm
Single
Redmi K40 Pro+
20 MP, f/2.5, (wide), 1/3.4", 0.8µm
Redmi K90 Max
20 MP (wide)
Features
Redmi K40 Pro+
HDR
Redmi K90 Max
HDR
Video
Redmi K40 Pro+
1080p@30fps, 720p@120fps
Redmi K90 Max
1080p@30/60fps
Loudspeaker
Redmi K40 Pro+
Yes, with stereo speakers
Redmi K90 Max
Yes, with stereo speakers (with Dolby Atmos)
3.5mm jack
Redmi K40 Pro+
No
Redmi K90 Max
No
Other
Redmi K40 Pro+
24-bit/192kHz Hi-Res audio
Redmi K90 Max
Tuned by Bose Bose 2.1 stereo sound system with a woofer 24-bit/192kHz Hi-Res & Hi-Res wireless audio
WLAN
Redmi K40 Pro+
Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct
Redmi K90 Max
Wi-Fi 802.11 a/b/g/n/ac/6/7, dual-band, Wi-Fi Direct
Bluetooth
Redmi K40 Pro+
5.2, A2DP, LE
Redmi K90 Max
5.4, A2DP, LE, LHDC 5, Auracast, ASHA, MIHC
Positioning
Redmi K40 Pro+
GPS (L1+L5), GLONASS (G1), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5)
Redmi K90 Max
GPS (L1+L5), BDS (B1I+B1c+B2a+B2b), GALILEO (E1+E5a+E5b), QZSS (L1+L5), GLONASS, NavIC
NFC
Redmi K40 Pro+
Yes
Redmi K90 Max
Yes
Infrared port
Redmi K40 Pro+
Yes
Redmi K90 Max
Yes
Radio
Redmi K40 Pro+
No
Redmi K90 Max
No
USB
Redmi K40 Pro+
USB Type-C 2.0, OTG
Redmi K90 Max
USB Type-C
Sensors
Redmi K40 Pro+
Fingerprint (side-mounted), accelerometer, gyro, proximity, compass, barometer
Redmi K90 Max
Fingerprint (under display, ultrasonic), accelerometer, proximity, gyro, compass
Type
Redmi K40 Pro+
Li-Po 4520 mAh
Redmi K90 Max
8550 mAh
Charging
Redmi K40 Pro+
33W wired, PD3.0, QC3, 100% in 52 min
Redmi K90 Max
100W wired, 100W PPS, PD3.0 22.5W reverse wired
Colors
Redmi K40 Pro+
Black, White, Aurora
Redmi K90 Max
Silver, Blue, Black
Price
Redmi K40 Pro+
About 470 EUR
Redmi K90 Max
About 440 EUR