Redmi K90 Ultra vs Xiaomi Mi 8
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Xiaomi Mi 8 (2018) runs on the Qualcomm Snapdragon 845; launch prices were $420 and $460. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 34/100 (a 39-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 3400); the main camera is 50 MP vs 12 MP; the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 572,788); the Xiaomi Mi 8 is noticeably lighter (175g vs 227g).
Profile comparison
Category scores
Redmi K90 Ultra
Xiaomi Mi 8
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 572788
- Better Geekbench Single: 3013 vs 566
- Better Geekbench Multi: 9287 vs 2130
- Bigger battery: 8550 vs 3400 mAh
- Faster charging: 100W vs 18W
- Better main camera: 50MP vs 12MP
- Higher refresh rate: 165Hz vs 60Hz
- Cheaper at launch: $420 vs $460
- Higher performance (92/100 vs 41/100)
- Better camera (37/100 vs 19/100)
- Longer battery life (78/100 vs 12/100)
- Better display (94/100 vs 56/100)
What makes Xiaomi Mi 8 better?
- Lighter: 175g vs 227g
- Better portability (78/100 vs 40/100)
Comparison verdict
Comparing the Redmi K90 Ultra vs the Xiaomi Mi 8, the Redmi K90 Ultra scores 39 points higher (73/100 vs 34/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 41/100). In the "camera" category, the Redmi K90 Ultra leads (37/100 vs 19/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 12/100). Value score: Redmi K90 Ultra — 72/100, Xiaomi Mi 8 — 0/100; 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 8 (92/100 vs 41/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Xiaomi Mi 8 (94/100 vs 56/100). In the "camera" category, the Redmi K90 Ultra notably outperforms the Xiaomi Mi 8 (37/100 vs 19/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Xiaomi Mi 8 (78/100 vs 12/100). In the "portability" category, the Xiaomi Mi 8 significantly outperforms the Redmi K90 Ultra (78/100 vs 40/100).
Specs comparison
| Specification | Redmi K90 Ultra | Xiaomi Mi 8 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 845 | |
| AnTuTu | 3233695 | 572788 | |
| Geekbench Single | 3013 | 566 | |
| Geekbench Multi | 9287 | 2130 | |
| Display | 6.8" AMOLED | 6.2" AMOLED | |
| Resolution | 1280x2772 | 2248x1080 | |
| Refresh rate | 165 Hz | 60 Hz | |
| Battery | 8550 mAh | 3400 mAh | |
| Charging | 100W | 18W | |
| Main camera | 50 MP | 12 MP | |
| Ultrawide | 8 MP | 0 MP | |
| Telephoto | 0 MP | 12 MP | |
| Front camera | 20 MP | 20 MP | |
| RAM | 12GB / 16GB | 6GB | |
| Storage | 256GB / 512GB | 64GB / 128GB / 256GB | |
| OS | Android 16 | Android 8.1 | |
| Brightness (peak) | 3500 nits | — | |
| NFC | yes | yes | |
| Protection | IP68/IP69 | — | |
| Dimensions | 162.9×77.9×8.2 mm | 154.9×74.8×7.6 mm | |
| Weight | 227 g | 175 g | |
| Launch price | $420 | $460 |
Camera comparison
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Xiaomi Mi 8
- Main: 12MP f/1.8
- Telephoto: 12MP
- Front: 20MP
Display comparison
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Xiaomi Mi 8
- 6.2" AMOLED
- Resolution: 2248x1080
- Refresh rate: 60 Hz
Battery and charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Xiaomi Mi 8
- 3400 mAh
- Wired: 18W
- No wireless charging
Overall performance score
We compared Redmi K90 Ultra and Xiaomi Mi 8, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Xiaomi Mi 8 by 464.6% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $40. Redmi K90 Ultra was $40 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Xiaomi Mi 8 (92/100 vs 41/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Xiaomi Mi 8 (94/100 vs 56/100).
camera
In the "camera" category, the Redmi K90 Ultra notably outperforms the Xiaomi Mi 8 (37/100 vs 19/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Xiaomi Mi 8 (78/100 vs 12/100).
portability
In the "portability" category, the Xiaomi Mi 8 significantly outperforms the Redmi K90 Ultra (78/100 vs 40/100).
Frequently asked questions
Which is better: the Redmi K90 Ultra or the Xiaomi Mi 8?
The Redmi K90 Ultra significantly outperforms the Xiaomi Mi 8 by 39 points (73/100 vs 34/100).
What is the rating of the Redmi K90 Ultra and the Xiaomi Mi 8?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Xiaomi Mi 8 — 34/100.
Which has the better camera: the Redmi K90 Ultra or the Xiaomi Mi 8?
The Redmi K90 Ultra leads on camera score (37/100 vs 19/100).
Which is more powerful: the Redmi K90 Ultra or the Xiaomi Mi 8?
The Redmi K90 Ultra leads on performance (92/100 vs 41/100).
Should you choose the Redmi K90 Ultra over the Xiaomi Mi 8?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.