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 (3,119,308 vs 195,539); the Redmi K90 Ultra has NFC for contactless payments, the Redmi A3X doesn't; the Redmi A3X is noticeably lighter (192g vs 227g).
Redmi A3X
Redmi K90 Ultra
- Lighter: 192g vs 227g
- Cheaper at launch: $80 vs $420
- Better portability (61/100 vs 40/100)
- Higher AnTuTu: 3119308 vs 195539
- Better Geekbench Single: 3041 vs 189
- Better Geekbench Multi: 9494 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)
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 — 26/100, Redmi K90 Ultra — 82/100; it is biased by price level, so it should not be compared directly between devices at different prices. 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).
| Specification | Redmi A3X | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | MediaTek Helio G36 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 195539 | 3119308 | |
| Geekbench Single | 189 | 3041 | |
| Geekbench Multi | 781 | 9494 | |
| 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 |
Redmi A3X
- Main: 8MP
- Front: 5MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Redmi A3X
- 6.7" IPS LCD
- Resolution: 720x1650
- Refresh rate: 60 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Redmi A3X
- 5000 mAh
- Wired: 10W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
We compared Redmi A3X and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Redmi A3X by 93.7% in our overall performance rating.
Launch price difference: $340. Redmi A3X was $340 cheaper at launch.
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).
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 A3X 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.