Redmi K90 Ultra vs Redmi Note 4X
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Redmi Note 4X (2017) runs on the Qualcomm Snapdragon 625; launch prices were $420 and $160. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 22/100 (a 51-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 4100); the main camera is 50 MP vs 13 MP; the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 218,879); the Redmi K90 Ultra has NFC for contactless payments, the Redmi Note 4X doesn't; the Redmi Note 4X is noticeably lighter (165g vs 227g).
Redmi K90 Ultra
Redmi Note 4X
- Higher AnTuTu: 3233695 vs 218879
- Better Geekbench Single: 3041 vs 189
- Better Geekbench Multi: 9494 vs 862
- Bigger battery: 8550 vs 4100 mAh
- Better main camera: 50MP vs 13MP
- Higher refresh rate: 165Hz vs 60Hz
- Higher performance (92/100 vs 14/100)
- Better camera (37/100 vs 10/100)
- Longer battery life (78/100 vs 35/100)
- Better display (94/100 vs 32/100)
- Lighter: 165g vs 227g
- Cheaper at launch: $160 vs $420
- Better portability (74/100 vs 40/100)
Comparing the Redmi K90 Ultra vs the Redmi Note 4X, the Redmi K90 Ultra scores 51 points higher (73/100 vs 22/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 14/100). In the "camera" category, the Redmi K90 Ultra leads (37/100 vs 10/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 35/100). Value score: Redmi K90 Ultra — 82/100, Redmi Note 4X — 16/100; it is biased by price level, so it should not be compared directly between devices at different prices. In the "performance" category, the Redmi K90 Ultra significantly outperforms the Redmi Note 4X (92/100 vs 14/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Redmi Note 4X (94/100 vs 32/100). In the "camera" category, the Redmi K90 Ultra notably outperforms the Redmi Note 4X (37/100 vs 10/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Redmi Note 4X (78/100 vs 35/100). In the "portability" category, the Redmi Note 4X significantly outperforms the Redmi K90 Ultra (74/100 vs 40/100).
| Specification | Redmi K90 Ultra | Redmi Note 4X | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 625 | |
| AnTuTu | 3233695 | 218879 | |
| Geekbench Single | 3041 | 189 | |
| Geekbench Multi | 9494 | 862 | |
| Display | 6.8" AMOLED | 5.5" IPS LCD | |
| Resolution | 1280x2772 | — | |
| Refresh rate | 165 Hz | 60 Hz | |
| Battery | 8550 mAh | 4100 mAh | |
| Charging | 100W | — | |
| Main camera | 50 MP | 13 MP | |
| Ultrawide | 8 MP | 0 MP | |
| Front camera | 20 MP | 5 MP | |
| RAM | 12GB / 16GB | 3GB / 4GB | |
| Storage | 256GB / 512GB | 32GB / 64GB | |
| OS | Android 16 | — | |
| Brightness (peak) | 3500 nits | — | |
| NFC | yes | no | |
| Protection | IP68/IP69 | — | |
| Dimensions | 162.9×77.9×8.2 mm | 151.0×76.0×8.5 mm | |
| Weight | 227 g | 165 g | |
| Launch price | $420 | $160 |
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Redmi Note 4X
- Main: 13MP
- Front: 5MP
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Redmi Note 4X
- 5.5" IPS LCD
- Refresh rate: 60 Hz
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Redmi Note 4X
- 4100 mAh
- Wireless charging: no data
We compared Redmi K90 Ultra and Redmi Note 4X, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Redmi Note 4X by 1377.4% in our overall performance rating.
Launch price difference: $260. Redmi Note 4X was $260 cheaper at launch.
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Redmi Note 4X (92/100 vs 14/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Redmi Note 4X (94/100 vs 32/100).
camera
In the "camera" category, the Redmi K90 Ultra notably outperforms the Redmi Note 4X (37/100 vs 10/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Redmi Note 4X (78/100 vs 35/100).
portability
In the "portability" category, the Redmi Note 4X significantly outperforms the Redmi K90 Ultra (74/100 vs 40/100).
Which is better: the Redmi K90 Ultra or the Redmi Note 4X?
The Redmi K90 Ultra significantly outperforms the Redmi Note 4X by 51 points (73/100 vs 22/100).
What is the rating of the Redmi K90 Ultra and the Redmi Note 4X?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Redmi Note 4X — 22/100.
Which has the better camera: the Redmi K90 Ultra or the Redmi Note 4X?
The Redmi K90 Ultra leads on camera score (37/100 vs 10/100).
Which is more powerful: the Redmi K90 Ultra or the Redmi Note 4X?
The Redmi K90 Ultra leads on performance (92/100 vs 14/100).
Should you choose the Redmi K90 Ultra over the Redmi Note 4X?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers. The Redmi Note 4X is a better fit for everyday use.