Redmi K90 Ultra vs Xiaomi Mix Fold 4
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Xiaomi Mix Fold 4 (2024) runs on the Qualcomm Snapdragon 8 Gen 3. Both devices score the same overall rating of 73/100. Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 5100); the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 2,342,433); the Xiaomi Mix Fold 4 is thinner (4.6mm vs 8.2mm).
Redmi K90 Ultra
Xiaomi Mix Fold 4
- Higher AnTuTu: 3233695 vs 2342433
- Better Geekbench Single: 3041 vs 2205
- Better Geekbench Multi: 9494 vs 7192
- Bigger battery: 8550 vs 5100 mAh
- Faster charging: 100W vs 67W
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (92/100 vs 83/100)
- Longer battery life (78/100 vs 70/100)
- Better display (94/100 vs 81/100)
- Lighter: 226g vs 227g
- Better camera (58/100 vs 37/100)
- Better portability (59/100 vs 40/100)
The Redmi K90 Ultra and the Xiaomi Mix Fold 4 received the same MobileRank rating — 73/100. In the "camera" category, the Xiaomi Mix Fold 4 leads (58/100 vs 37/100). In the "performance" category, the Redmi K90 Ultra is a bit better (92/100 vs 83/100). In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 81/100). In the "camera" category, the Xiaomi Mix Fold 4 notably outperforms the Redmi K90 Ultra (58/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra is a bit better (78/100 vs 70/100). In the "portability" category, the Xiaomi Mix Fold 4 notably outperforms the Redmi K90 Ultra (59/100 vs 40/100).
| Specification | Redmi K90 Ultra | Xiaomi Mix Fold 4 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 8 Gen 3 | |
| AnTuTu | 3233695 | 2342433 | |
| Geekbench Single | 3041 | 2205 | |
| Geekbench Multi | 9494 | 7192 | |
| Display | 6.8" AMOLED | 8.0" Foldable LTPO AMOLED | |
| Resolution | 1280x2772 | 2224x2488 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8550 mAh | 5100 mAh | |
| Charging | 100W | 67W | |
| Wireless charging | 0W | 50W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 8 MP | 12 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 20 MP | 16 MP | |
| RAM | 12GB / 16GB | 12GB / 16GB | |
| Storage | 256GB / 512GB | 256GB / 512GB / 1TB | |
| OS | Android 16 | Android 14, HyperOS | |
| Brightness (peak) | 3500 nits | 3000 nits | |
| NFC | yes | yes | |
| Protection | IP68/IP69 | IPX8 | |
| Dimensions | 162.9×77.9×8.2 mm | 159.4×143.3×4.6 mm | |
| Weight | 227 g | 226 g | |
| Launch price | $420 | — |
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Xiaomi Mix Fold 4
- Main: 50MP f/f/1.7
- Ultrawide: 12MP
- Telephoto: 50MP
- Front: 16MP
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Xiaomi Mix Fold 4
- 8.0" Foldable LTPO AMOLED
- Resolution: 2224x2488
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Xiaomi Mix Fold 4
- 5100 mAh
- Wired: 67W
- Wireless: 50W
We compared Redmi K90 Ultra and Xiaomi Mix Fold 4, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Xiaomi Mix Fold 4 by 38.0% in our overall performance rating.
Xiaomi Mix Fold 4
Price unknownperformance
In the "performance" category, the Redmi K90 Ultra is a bit better (92/100 vs 83/100).
display
In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 81/100).
camera
In the "camera" category, the Xiaomi Mix Fold 4 notably outperforms the Redmi K90 Ultra (58/100 vs 37/100).
battery
In the "battery" category, the Redmi K90 Ultra is a bit better (78/100 vs 70/100).
portability
In the "portability" category, the Xiaomi Mix Fold 4 notably outperforms the Redmi K90 Ultra (59/100 vs 40/100).
Which is better: the Redmi K90 Ultra or the Xiaomi Mix Fold 4?
Both devices scored 73/100. The choice depends on your priorities: if performance matters more — go with the Redmi K90 Ultra.
What is the rating of the Redmi K90 Ultra and the Xiaomi Mix Fold 4?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Xiaomi Mix Fold 4 — 73/100.
Which has the better camera: the Redmi K90 Ultra or the Xiaomi Mix Fold 4?
The Xiaomi Mix Fold 4 leads on camera score (58/100 vs 37/100).
Which is more powerful: the Redmi K90 Ultra or the Xiaomi Mix Fold 4?
The Redmi K90 Ultra leads on performance (92/100 vs 83/100).
Should you choose the Redmi K90 Ultra over the Xiaomi Mix Fold 4?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers. The Xiaomi Mix Fold 4 is a better fit for gamers and power users.