Screen size
Mix Fold 4Winner: 8.0"+14%
Redmi K90 Max6.8"
Quick verdict
Redmi K90 Max leads the measured specs 8-7.
Measured wins
Mix Fold 4
7
spec wins
Ties
8
equal specs
Redmi K90 Max
8
spec wins
Overall winner
Screen size
Technology
Mix Fold 4
GSM / CDMA / HSPA / EVDO / LTE / 5G
Redmi K90 Max
GSM / HSPA / LTE / 5G
2G bands
Mix Fold 4
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900
Redmi K90 Max
GSM 850 / 900 / 1800 / 1900
3G bands
Mix Fold 4
HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100 , CDMA2000 1xEV-DO
Redmi K90 Max
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands
Mix Fold 4
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
equal specsStorage
equal specsMain camera
equal specsFront camera
Battery
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, 48, 66
Redmi K90 Max
1, 3, 4, 5, 7, 8, 19, 28, 34, 38, 39, 40, 41, 42, 43, 48, 66
5G bands
Mix Fold 4
1, 2, 3, 5, 7, 8, 12, 20, 26, 28, 38, 40, 41, 48, 66, 77, 78, 79 SA/NSA
Redmi K90 Max
1, 3, 5, 7, 8, 28, 34, 38, 39, 40, 41, 48, 77, 78 SA/NSA
Speed
Mix Fold 4
HSPA, LTE, 5G
Redmi K90 Max
HSPA, LTE, 5G
Announced
Mix Fold 4
2024, July 19
Redmi K90 Max
2026, April 21
Status
Mix Fold 4
Available. Released 2024, July 19
Redmi K90 Max
Available. Released 2026, April 21
Dimensions
Mix Fold 4
Unfolded: 159.4 x 143.3 x 4.6 mm Folded: 159.4 x 73.1 x 9.5 mm
Redmi K90 Max
162.9 x 77.9 x 8.2 mm (6.41 x 3.07 x 0.32 in)
Weight
Mix Fold 4
226 g or 228 g (7.97 oz)
Redmi K90 Max
227 g (8.01 oz)
Build
Mix Fold 4
Glass front (folded), plastic front (unfolded), aluminum frame
Redmi K90 Max
Glass front (Dragon Crystal Glass), aluminum frame, glass-fiber reinforced plastic back or silicone polymer back
SIM
Mix Fold 4
Nano-SIM + Nano-SIM
Redmi K90 Max
Nano-SIM + Nano-SIM
Other
Mix Fold 4
IPX8 water resistant (immersible up to 1.5m for 30 min)
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
Type
Mix Fold 4
Foldable LTPO AMOLED, 1B colors, 120Hz, HDR10+, Dolby Vision, 1700 nits (HBM), 3000 nits (peak)
Redmi K90 Max
AMOLED, 68B colors, 165Hz, Dolby Vision, HDR10+, HDR Vivid, 3500 nits (peak)
Size
Mix Fold 4
7.98 inches, 204.1 cm2 (~89.4% screen-to-body ratio)
Redmi K90 Max
6.83 inches, 114.5 cm2 (~90.3% screen-to-body ratio)
Resolution
Mix Fold 4
2224 x 2488 pixels (~418 ppi density)
Redmi K90 Max
1280 x 2772 pixels, 19.5:9 ratio (~447 ppi density)
Other
Mix Fold 4
Cover display: LTPO AMOLED, 68B colors, 120Hz, HDR10+, Dolby Vision, 1700 nits (HBM), 3000 nits (peak) 6.56 inches, 1080 x 2520 pixels, 21:9 ratio Scratch/drop-resistant glass
Redmi K90 Max
-
Protection
Mix Fold 4
-
Redmi K90 Max
Dragon Crystal Glass
OS
Mix Fold 4
Android 14, HyperOS
Redmi K90 Max
Android 16, HyperOS 3
Chipset
Mix Fold 4
Qualcomm SM8650-AB Snapdragon 8 Gen 3 (4 nm)
Redmi K90 Max
MediaTek Dimensity 9500 (3 nm)
CPU
Mix Fold 4
Octa-core (1x3.3 GHz Cortex-X4 & 3x3.2 GHz Cortex-A720 & 2x3.0 GHz Cortex-A720 & 2x2.3 GHz Cortex-A520)
Redmi K90 Max
Octa-core (1x4.21 GHz C1-Ultra & 3x3.5 GHz C1-Premium & 4x2.7 GHz C1-Pro)
GPU
Mix Fold 4
Adreno 750
Redmi K90 Max
Mali-G1 Ultra MC12
Card slot
Mix Fold 4
No
Redmi K90 Max
No
Internal
Mix Fold 4
256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM
Redmi K90 Max
256GB 12GB RAM, 256GB 16GB RAM, 512GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM
Other
Mix Fold 4
UFS 4.0
Redmi K90 Max
UFS 4.1
Quad
Mix Fold 4
50 MP, f/1.7, 23mm (wide), 1/1.49", 1.0µm, PDAF, OIS 50 MP, f/2.0, 47mm (telephoto), PDAF (9cm - ∞), OIS, 2x optical zoom 10 MP, f/2.9, 115mm (periscope telephoto), PDAF (30cm - ∞), OIS, 5x optical zoom 12 MP, f/2.2, 15mm, 120˚ (ultrawide)
Redmi K90 Max
-
Features
Mix Fold 4
Laser AF, color spectrum sensor, LED flash, HDR, panorama, Leica lenses
Redmi K90 Max
LED flash, HDR, panorama
Video
Mix Fold 4
8K@24fps, 4K@24/30/60fps, 1080p@30/60/120/240/960fps, 720p@1920fps, Dolby Vision HDR
Redmi K90 Max
8K@30fps, 4K@30/60fps, 1080p@30/60/120/240/960fps, gyro-EIS
Dual
Mix Fold 4
-
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
Mix Fold 4
16 MP, (wide) Cover camera: 16 MP, (wide)
Redmi K90 Max
20 MP (wide)
Features
Mix Fold 4
Dolby Vision HDR
Redmi K90 Max
HDR
Video
Mix Fold 4
1080p@30/60fps
Redmi K90 Max
1080p@30/60fps
Loudspeaker
Mix Fold 4
Yes, with stereo speakers
Redmi K90 Max
Yes, with stereo speakers (with Dolby Atmos)
3.5mm jack
Mix Fold 4
No
Redmi K90 Max
No
Other
Mix Fold 4
24-bit/192kHz Hi-Res & Hi-Res Wireless audio Snapdragon Sound
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
Mix Fold 4
Wi-Fi 802.11 a/b/g/n/ac/6e/7, dual-band (tri-band after future SW update), Wi-Fi Direct
Redmi K90 Max
Wi-Fi 802.11 a/b/g/n/ac/6/7, dual-band, Wi-Fi Direct
Bluetooth
Mix Fold 4
5.4, A2DP, LE, aptX HD, aptX Adaptive, LHDC
Redmi K90 Max
5.4, A2DP, LE, LHDC 5, Auracast, ASHA, MIHC
Positioning
Mix Fold 4
GPS (L1+L5), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5), GLONASS
Redmi K90 Max
GPS (L1+L5), BDS (B1I+B1c+B2a+B2b), GALILEO (E1+E5a+E5b), QZSS (L1+L5), GLONASS, NavIC
NFC
Mix Fold 4
Yes
Redmi K90 Max
Yes
Infrared port
Mix Fold 4
Yes
Redmi K90 Max
Yes
Radio
Mix Fold 4
No
Redmi K90 Max
No
USB
Mix Fold 4
USB Type-C 3.2, OTG
Redmi K90 Max
USB Type-C
Sensors
Mix Fold 4
Fingerprint (side-mounted), accelerometer, gyro, proximity, compass, barometer
Redmi K90 Max
Fingerprint (under display, ultrasonic), accelerometer, proximity, gyro, compass
Other
Mix Fold 4
Two-way satellite communication (calls, messages)
Redmi K90 Max
-
Type
Mix Fold 4
5100 mAh
Redmi K90 Max
8550 mAh
Charging
Mix Fold 4
67W wired, PD3.0, QC4, 31% in 10 min 50W wireless, 24% in 10 min
Redmi K90 Max
100W wired, 100W PPS, PD3.0 22.5W reverse wired
Colors
Mix Fold 4
Black, White, Blue
Redmi K90 Max
Silver, Blue, Black
Price
Mix Fold 4
About 1140 EUR
Redmi K90 Max
About 440 EUR