Redmi K90 Ultra vs Vivo Y400 4G
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Vivo Y400 4G (2025) runs on the Qualcomm Snapdragon 685; launch prices were $420 and $200. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 44/100 (a 29-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 6000); the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 476,175); the Vivo Y400 4G is noticeably lighter (197g vs 227g).
Profile comparison
Category scores
Redmi K90 Ultra
Vivo Y400 4G
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 476175
- Better Geekbench Single: 3013 vs 466
- Better Geekbench Multi: 9287 vs 1396
- Bigger battery: 8550 vs 6000 mAh
- Faster charging: 100W vs 44W
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (92/100 vs 34/100)
- Better camera (37/100 vs 30/100)
- Longer battery life (78/100 vs 56/100)
- Better display (94/100 vs 79/100)
What makes Vivo Y400 4G better?
- Lighter: 197g vs 227g
- Cheaper at launch: $200 vs $420
- Better portability (62/100 vs 40/100)
Comparison verdict
Comparing the Redmi K90 Ultra vs the Vivo Y400 4G, the Redmi K90 Ultra scores 29 points higher (73/100 vs 44/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 34/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 56/100). Value score: Redmi K90 Ultra — 72/100, Vivo Y400 4G — 48/100; 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 Vivo Y400 4G (92/100 vs 34/100). In the "display" category, the Redmi K90 Ultra notably outperforms the Vivo Y400 4G (94/100 vs 79/100). In the "camera" category, the Redmi K90 Ultra is a bit better (37/100 vs 30/100). In the "battery" category, the Redmi K90 Ultra notably outperforms the Vivo Y400 4G (78/100 vs 56/100). In the "portability" category, the Vivo Y400 4G notably outperforms the Redmi K90 Ultra (62/100 vs 40/100).
Specs comparison
| Specification | Redmi K90 Ultra | Vivo Y400 4G | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 685 | |
| AnTuTu | 3233695 | 476175 | |
| Geekbench Single | 3013 | 466 | |
| Geekbench Multi | 9287 | 1396 | |
| Display | 6.8" AMOLED | 6.7" AMOLED | |
| Resolution | 1280x2772 | 1080x2400 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8550 mAh | 6000 mAh | |
| Charging | 100W | 44W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 8 MP | 0 MP | |
| Front camera | 20 MP | 8 MP | |
| RAM | 12GB / 16GB | 8GB | |
| Storage | 256GB / 512GB | 128GB / 256GB | |
| OS | Android 16 | Android 15 | |
| Brightness (peak) | 3500 nits | 1800 nits | |
| NFC | yes | yes | |
| Protection | IP68/IP69 | IP69 | |
| Dimensions | 162.9×77.9×8.2 mm | 162.3×75.3×7.9 mm | |
| Weight | 227 g | 197 g | |
| Launch price | $420 | $200 |
Camera comparison
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Vivo Y400 4G
- Main: 50MP f/1.8
- Front: 8MP
Display comparison
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Vivo Y400 4G
- 6.7" AMOLED
- Resolution: 1080x2400
- Refresh rate: 120 Hz
Battery and charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Vivo Y400 4G
- 6000 mAh
- Wired: 44W
- No wireless charging
Overall performance score
We compared Redmi K90 Ultra and Vivo Y400 4G, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Vivo Y400 4G by 579.1% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $220. Vivo Y400 4G was $220 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Vivo Y400 4G (92/100 vs 34/100).
display
In the "display" category, the Redmi K90 Ultra notably outperforms the Vivo Y400 4G (94/100 vs 79/100).
camera
In the "camera" category, the Redmi K90 Ultra is a bit better (37/100 vs 30/100).
battery
In the "battery" category, the Redmi K90 Ultra notably outperforms the Vivo Y400 4G (78/100 vs 56/100).
portability
In the "portability" category, the Vivo Y400 4G notably outperforms the Redmi K90 Ultra (62/100 vs 40/100).
Frequently asked questions
Which is better: the Redmi K90 Ultra or the Vivo Y400 4G?
The Redmi K90 Ultra significantly outperforms the Vivo Y400 4G by 29 points (73/100 vs 44/100).
What is the rating of the Redmi K90 Ultra and the Vivo Y400 4G?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Vivo Y400 4G — 44/100.
Which has the better camera: the Redmi K90 Ultra or the Vivo Y400 4G?
The Redmi K90 Ultra leads on camera score (37/100 vs 30/100).
Which is more powerful: the Redmi K90 Ultra or the Vivo Y400 4G?
The Redmi K90 Ultra leads on performance (92/100 vs 34/100).
Should you choose the Redmi K90 Ultra over the Vivo Y400 4G?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.