Infinix S4 vs Redmi K90 Ultra
The Infinix S4 (2019) runs on the MediaTek Helio P22, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 23/100 (a 50-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 4000); the main camera is 13 MP vs 50 MP; the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 177,554); the Redmi K90 Ultra has NFC for contactless payments, the Infinix S4 doesn't; the Infinix S4 is noticeably lighter (154g vs 227g).
Profile comparison
Category scores
Infinix S4
Redmi K90 Ultra
What makes Infinix S4 better?
- Lighter: 154g vs 227g
- Better portability (84/100 vs 40/100)
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 177554
- Better Geekbench Single: 3013 vs 233
- Better Geekbench Multi: 9287 vs 723
- Bigger battery: 8550 vs 4000 mAh
- Better main camera: 50MP vs 13MP
- Higher performance (92/100 vs 10/100)
- Better camera (37/100 vs 18/100)
- Longer battery life (78/100 vs 32/100)
- Better display (94/100 vs 37/100)
Comparison verdict
Comparing the Infinix S4 vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 50 points higher (73/100 vs 23/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 10/100). In the "camera" category, the Redmi K90 Ultra leads (37/100 vs 18/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 32/100). In the "performance" category, the Redmi K90 Ultra significantly outperforms the Infinix S4 (92/100 vs 10/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Infinix S4 (94/100 vs 37/100). In the "camera" category, the Redmi K90 Ultra notably outperforms the Infinix S4 (37/100 vs 18/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Infinix S4 (78/100 vs 32/100). In the "portability" category, the Infinix S4 significantly outperforms the Redmi K90 Ultra (84/100 vs 40/100).
Specs comparison
| Specification | Infinix S4 | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | MediaTek Helio P22 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 177554 | 3233695 | |
| Geekbench Single | 233 | 3013 | |
| Geekbench Multi | 723 | 9287 | |
| Display | 6.2" IPS LCD | 6.8" AMOLED | |
| Resolution | 720x1440 | 1280x2772 | |
| Refresh rate | — | 165 Hz | |
| Battery | 4000 mAh | 8550 mAh | |
| Charging | — | 100W | |
| Main camera | 13 MP | 50 MP | |
| Ultrawide | 0 MP | 8 MP | |
| Front camera | 32 MP | 20 MP | |
| RAM | 3GB / 4GB | 12GB / 16GB | |
| Storage | 32GB / 64GB | 256GB / 512GB | |
| OS | Android 9.0 (Pie) | Android 16 | |
| Brightness (peak) | — | 3500 nits | |
| NFC | no | yes | |
| Protection | — | IP68/IP69 | |
| Dimensions | 156.0×75.0×7.9 mm | 162.9×77.9×8.2 mm | |
| Weight | 154 g | 227 g | |
| Launch price | — | $420 |
Camera comparison
Infinix S4
- Main: 13MP
- Front: 32MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
Infinix S4
- 6.2" IPS LCD
- Resolution: 720x1440
- Refresh rate: —
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
Infinix S4
- 4000 mAh
- Wireless charging: no data
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared Infinix S4 and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Infinix S4 by 94.5% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Infinix S4
Price unknownDetailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Infinix S4 (92/100 vs 10/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Infinix S4 (94/100 vs 37/100).
camera
In the "camera" category, the Redmi K90 Ultra notably outperforms the Infinix S4 (37/100 vs 18/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Infinix S4 (78/100 vs 32/100).
portability
In the "portability" category, the Infinix S4 significantly outperforms the Redmi K90 Ultra (84/100 vs 40/100).
Frequently asked questions
Which is better: the Infinix S4 or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the Infinix S4 by 50 points (73/100 vs 23/100).
What is the rating of the Infinix S4 and the Redmi K90 Ultra?
The Infinix S4 has a MobileRank rating of 23/100, the Redmi K90 Ultra — 73/100.
Which has the better camera: the Infinix S4 or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on camera score (37/100 vs 18/100).
Which is more powerful: the Infinix S4 or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 10/100).
Should you choose the Infinix S4 over the Redmi K90 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.