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 (3,233,695 vs 824,513); the Xiaomi Mi 9 is noticeably lighter (173g vs 227g).
Profile comparison
Category scores
Redmi K90 Ultra
Xiaomi Mi 9
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 824513
- Better Geekbench Single: 3013 vs 968
- Better Geekbench Multi: 9287 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)
What makes Xiaomi Mi 9 better?
- Lighter: 173g vs 227g
- Cheaper at launch: $400 vs $420
- Better camera (44/100 vs 37/100)
- Better portability (79/100 vs 40/100)
Comparison verdict
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 — 72/100, Xiaomi Mi 9 — 22/100; it shows how far a model sits above or below the usual level for its price, and is not part of the overall rating. 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).
Specs comparison
| Specification | Redmi K90 Ultra | Xiaomi Mi 9 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 855 | |
| AnTuTu | 3233695 | 824513 | |
| Geekbench Single | 3013 | 968 | |
| Geekbench Multi | 9287 | 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 |
Camera comparison
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
Display comparison
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Xiaomi Mi 9
- 6.4" AMOLED
- Resolution: 2340x1080
- Refresh rate: 60 Hz
Battery and charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Xiaomi Mi 9
- 3300 mAh
- Wired: 27W
- Wireless: 20W
Overall performance score
We compared Redmi K90 Ultra and Xiaomi Mi 9, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Xiaomi Mi 9 by 292.2% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $20. Xiaomi Mi 9 was $20 cheaper at launch.
Detailed category analysis
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).
Frequently asked questions
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.