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 22/100 (a 51-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 156,818); the Redmi K90 Ultra has NFC for contactless payments, the Infinix S4 doesn't; the Infinix S4 is noticeably lighter (154g vs 227g).
Infinix S4
Redmi K90 Ultra
- Lighter: 154g vs 227g
- Better portability (84/100 vs 40/100)
- Higher AnTuTu: 3233695 vs 156818
- Better Geekbench Single: 3041 vs 233
- Better Geekbench Multi: 9494 vs 723
- Bigger battery: 8550 vs 4000 mAh
- Better main camera: 50MP vs 13MP
- Higher performance (92/100 vs 8/100)
- Better camera (37/100 vs 18/100)
- Longer battery life (78/100 vs 32/100)
- Better display (94/100 vs 37/100)
Comparing the Infinix S4 vs the Redmi K90 Ultra, 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 8/100). 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 8/100). 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).
| Specification | Infinix S4 | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | MediaTek Helio P22 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 156818 | 3233695 | |
| Geekbench Single | 233 | 3041 | |
| Geekbench Multi | 723 | 9494 | |
| 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 |
Infinix S4
- Main: 13MP
- Front: 32MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Infinix S4
- 6.2" IPS LCD
- Resolution: 720x1440
- Refresh rate: —
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Infinix S4
- 4000 mAh
- Wireless charging: no data
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
We compared Infinix S4 and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Infinix S4 by 95.2% in our overall performance rating.
Infinix S4
Price unknownperformance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Infinix S4 (92/100 vs 8/100).
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).
Which is better: the Infinix S4 or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the Infinix S4 by 51 points (73/100 vs 22/100).
What is the rating of the Infinix S4 and the Redmi K90 Ultra?
The Infinix S4 has a MobileRank rating of 22/100, 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 8/100).
Should you choose the Infinix S4 over the Redmi K90 Ultra?
The Infinix S4 is a better fit for everyday use. The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.