Redmi K90 Ultra vs Xiaomi Mi 9
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Xiaomi Mi 9 (2019) runs on the Qualcomm Snapdragon 855; launch prices were $420 and $400. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 47/100 (a 26-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 3300); the main camera is 50 MP vs 48 MP; the Redmi K90 Ultra is faster in AnTuTu (3,119,308 vs 824,513); the Xiaomi Mi 9 is noticeably lighter (173g vs 227g).
Redmi K90 Ultra
Xiaomi Mi 9
- Higher AnTuTu: 3119308 vs 824513
- Better Geekbench Single: 3041 vs 968
- Better Geekbench Multi: 9494 vs 2731
- Bigger battery: 8550 vs 3300 mAh
- Faster charging: 100W vs 27W
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 165Hz vs 60Hz
- Higher performance (92/100 vs 54/100)
- Longer battery life (78/100 vs 22/100)
- Better display (94/100 vs 56/100)
- Lighter: 173g vs 227g
- Cheaper at launch: $400 vs $420
- Better camera (44/100 vs 37/100)
- Better portability (79/100 vs 40/100)
Comparing the Redmi K90 Ultra vs the Xiaomi Mi 9, the Redmi K90 Ultra scores 26 points higher (73/100 vs 47/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 54/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 22/100). Value score: Redmi K90 Ultra — 82/100, Xiaomi Mi 9 — 32/100; 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 Xiaomi Mi 9 (92/100 vs 54/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Xiaomi Mi 9 (94/100 vs 56/100). In the "camera" category, the Xiaomi Mi 9 is a bit better (44/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Xiaomi Mi 9 (78/100 vs 22/100). In the "portability" category, the Xiaomi Mi 9 significantly outperforms the Redmi K90 Ultra (79/100 vs 40/100).
| Specification | Redmi K90 Ultra | Xiaomi Mi 9 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 855 | |
| AnTuTu | 3119308 | 824513 | |
| Geekbench Single | 3041 | 968 | |
| Geekbench Multi | 9494 | 2731 | |
| Display | 6.8" AMOLED | 6.4" AMOLED | |
| Resolution | 1280x2772 | 2340x1080 | |
| Refresh rate | 165 Hz | 60 Hz | |
| Battery | 8550 mAh | 3300 mAh | |
| Charging | 100W | 27W | |
| Wireless charging | 0W | 20W | |
| Main camera | 50 MP | 48 MP | |
| Ultrawide | 8 MP | 16 MP | |
| Telephoto | 0 MP | 12 MP | |
| Front camera | 20 MP | 20 MP | |
| RAM | 12GB / 16GB | 6GB / 8GB | |
| Storage | 256GB / 512GB | 64GB / 128GB | |
| OS | Android 16 | Android 9 | |
| Brightness (peak) | 3500 nits | — | |
| NFC | yes | yes | |
| Protection | IP68/IP69 | — | |
| Dimensions | 162.9×77.9×8.2 mm | 157.5×74.7×7.6 mm | |
| Weight | 227 g | 173 g | |
| Launch price | $420 | $400 |
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Xiaomi Mi 9
- Main: 48MP f/1.75
- Ultrawide: 16MP
- Telephoto: 12MP
- Front: 20MP
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Xiaomi Mi 9
- 6.4" AMOLED
- Resolution: 2340x1080
- Refresh rate: 60 Hz
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Xiaomi Mi 9
- 3300 mAh
- Wired: 27W
- Wireless: 20W
We compared Redmi K90 Ultra and Xiaomi Mi 9, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Xiaomi Mi 9 by 278.3% in our overall performance rating.
Launch price difference: $20. Xiaomi Mi 9 was $20 cheaper at launch.
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Xiaomi Mi 9 (92/100 vs 54/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Xiaomi Mi 9 (94/100 vs 56/100).
camera
In the "camera" category, the Xiaomi Mi 9 is a bit better (44/100 vs 37/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Xiaomi Mi 9 (78/100 vs 22/100).
portability
In the "portability" category, the Xiaomi Mi 9 significantly outperforms the Redmi K90 Ultra (79/100 vs 40/100).
Which is better: the Redmi K90 Ultra or the Xiaomi Mi 9?
The Redmi K90 Ultra significantly outperforms the Xiaomi Mi 9 by 26 points (73/100 vs 47/100).
What is the rating of the Redmi K90 Ultra and the Xiaomi Mi 9?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Xiaomi Mi 9 — 47/100.
Which has the better camera: the Redmi K90 Ultra or the Xiaomi Mi 9?
The Xiaomi Mi 9 leads on camera score (44/100 vs 37/100).
Which is more powerful: the Redmi K90 Ultra or the Xiaomi Mi 9?
The Redmi K90 Ultra leads on performance (92/100 vs 54/100).
Should you choose the Redmi K90 Ultra over the Xiaomi Mi 9?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers. The Xiaomi Mi 9 is a better fit for everyday use.