Redmi A3X vs Redmi K90 Ultra
The Redmi A3X (2025) runs on the MediaTek Helio G36, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $80 and $420. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 21/100 (a 52-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 5000); the main camera is 8 MP vs 50 MP; the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 193,858); the Redmi K90 Ultra has NFC for contactless payments, the Redmi A3X doesn't; the Redmi A3X is noticeably lighter (192g vs 227g).
Profile comparison
Category scores
Redmi A3X
Redmi K90 Ultra
What makes Redmi A3X better?
- Lighter: 192g vs 227g
- Cheaper at launch: $80 vs $420
- Better portability (61/100 vs 40/100)
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 193858
- Better Geekbench Single: 3013 vs 189
- Better Geekbench Multi: 9287 vs 781
- Bigger battery: 8550 vs 5000 mAh
- Faster charging: 100W vs 10W
- Better main camera: 50MP vs 8MP
- Higher refresh rate: 165Hz vs 60Hz
- Higher performance (92/100 vs 11/100)
- Better camera (37/100 vs 10/100)
- Longer battery life (78/100 vs 43/100)
- Better display (94/100 vs 32/100)
Comparison verdict
Comparing the Redmi A3X vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 52 points higher (73/100 vs 21/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 11/100). In the "camera" category, the Redmi K90 Ultra leads (37/100 vs 10/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 43/100). Value score: Redmi A3X — 38/100, Redmi K90 Ultra — 72/100; 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 Redmi A3X (92/100 vs 11/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Redmi A3X (94/100 vs 32/100). In the "camera" category, the Redmi K90 Ultra notably outperforms the Redmi A3X (37/100 vs 10/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Redmi A3X (78/100 vs 43/100). In the "portability" category, the Redmi A3X notably outperforms the Redmi K90 Ultra (61/100 vs 40/100).
Specs comparison
| Specification | Redmi A3X | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | MediaTek Helio G36 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 193858 | 3233695 | |
| Geekbench Single | 189 | 3013 | |
| Geekbench Multi | 781 | 9287 | |
| Display | 6.7" IPS LCD | 6.8" AMOLED | |
| Resolution | 720x1650 | 1280x2772 | |
| Refresh rate | 60 Hz | 165 Hz | |
| Battery | 5000 mAh | 8550 mAh | |
| Charging | 10W | 100W | |
| Main camera | 8 MP | 50 MP | |
| Ultrawide | 0 MP | 8 MP | |
| Front camera | 5 MP | 20 MP | |
| RAM | 2GB / 3GB | 12GB / 16GB | |
| Storage | 32GB / 64GB | 256GB / 512GB | |
| OS | Android 14, up to 2 major Android upgrades, MIUI | Android 16 | |
| Brightness (peak) | 500 nits | 3500 nits | |
| NFC | no | yes | |
| Protection | — | IP68/IP69 | |
| Dimensions | 168.4×76.3×8.3 mm | 162.9×77.9×8.2 mm | |
| Weight | 192 g | 227 g | |
| Launch price | $80 | $420 |
Camera comparison
Redmi A3X
- Main: 8MP
- Front: 5MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
Redmi A3X
- 6.7" IPS LCD
- Resolution: 720x1650
- Refresh rate: 60 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
Redmi A3X
- 5000 mAh
- Wired: 10W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared Redmi A3X and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Redmi A3X by 94.0% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $340. Redmi A3X was $340 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Redmi A3X (92/100 vs 11/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Redmi A3X (94/100 vs 32/100).
camera
In the "camera" category, the Redmi K90 Ultra notably outperforms the Redmi A3X (37/100 vs 10/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Redmi A3X (78/100 vs 43/100).
portability
In the "portability" category, the Redmi A3X notably outperforms the Redmi K90 Ultra (61/100 vs 40/100).
Frequently asked questions
Which is better: the Redmi A3X or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the Redmi A3X by 52 points (73/100 vs 21/100).
What is the rating of the Redmi A3X and the Redmi K90 Ultra?
The Redmi A3X has a MobileRank rating of 21/100, the Redmi K90 Ultra — 73/100.
Which has the better camera: the Redmi A3X or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on camera score (37/100 vs 10/100).
Which is more powerful: the Redmi A3X or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 11/100).
Should you choose the Redmi A3X over the Redmi K90 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.