Redmi K90 Ultra vs Vivo Y51
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Vivo Y51 (2020) runs on the Qualcomm Snapdragon 665. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 40/100 (a 33-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 5000); the main camera is 50 MP vs 48 MP; the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 329,457); the Redmi K90 Ultra has NFC for contactless payments, the Vivo Y51 doesn't; the Vivo Y51 is noticeably lighter (186g vs 227g).
Profile comparison
Category scores
Redmi K90 Ultra
Vivo Y51
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 329457
- Better Geekbench Single: 3013 vs 321
- Better Geekbench Multi: 9287 vs 1128
- Bigger battery: 8550 vs 5000 mAh
- Faster charging: 100W vs 18W
- Better main camera: 50MP vs 48MP
- Higher performance (92/100 vs 24/100)
- Better camera (37/100 vs 34/100)
- Longer battery life (78/100 vs 43/100)
- Better display (94/100 vs 83/100)
What makes Vivo Y51 better?
- Lighter: 186g vs 227g
- Better portability (59/100 vs 40/100)
Comparison verdict
Comparing the Redmi K90 Ultra vs the Vivo Y51, the Redmi K90 Ultra scores 33 points higher (73/100 vs 40/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 24/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 43/100). In the "performance" category, the Redmi K90 Ultra significantly outperforms the Vivo Y51 (92/100 vs 24/100). In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 83/100). In the "camera" category, the Redmi K90 Ultra and the Vivo Y51 are nearly equal (37/100 vs 34/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Vivo Y51 (78/100 vs 43/100). In the "portability" category, the Vivo Y51 notably outperforms the Redmi K90 Ultra (59/100 vs 40/100).
Specs comparison
| Specification | Redmi K90 Ultra | Vivo Y51 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 665 | |
| AnTuTu | 3233695 | 329457 | |
| Geekbench Single | 3013 | 321 | |
| Geekbench Multi | 9287 | 1128 | |
| Display | 6.8" AMOLED | 6.4" Super AMOLED | |
| Resolution | 1280x2772 | 1080x2340 | |
| Refresh rate | 165 Hz | — | |
| Battery | 8550 mAh | 5000 mAh | |
| Charging | 100W | 18W | |
| Main camera | 50 MP | 48 MP | |
| Ultrawide | 8 MP | 8 MP | |
| Front camera | 20 MP | 16 MP | |
| RAM | 12GB / 16GB | 8GB | |
| Storage | 256GB / 512GB | 128GB | |
| OS | Android 16 | Android 10, Funtouch 10 | |
| Brightness (peak) | 3500 nits | — | |
| NFC | yes | no | |
| Protection | IP68/IP69 | — | |
| Dimensions | 162.9×77.9×8.2 mm | 159.3×75.2×8.7 mm | |
| Weight | 227 g | 186 g | |
| Launch price | $420 | — |
Camera comparison
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Vivo Y51
- Main: 48MP f/1.8
- Ultrawide: 8MP
- Front: 16MP
Display comparison
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Vivo Y51
- 6.4" Super AMOLED
- Resolution: 1080x2340
- Refresh rate: —
Battery and charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Vivo Y51
- 5000 mAh
- Wired: 18W
- No wireless charging
Overall performance score
We compared Redmi K90 Ultra and Vivo Y51, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Vivo Y51 by 881.5% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Vivo Y51
Price unknownDetailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Vivo Y51 (92/100 vs 24/100).
display
In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 83/100).
camera
In the "camera" category, the Redmi K90 Ultra and the Vivo Y51 are nearly equal (37/100 vs 34/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Vivo Y51 (78/100 vs 43/100).
portability
In the "portability" category, the Vivo Y51 notably outperforms the Redmi K90 Ultra (59/100 vs 40/100).
Frequently asked questions
Which is better: the Redmi K90 Ultra or the Vivo Y51?
The Redmi K90 Ultra significantly outperforms the Vivo Y51 by 33 points (73/100 vs 40/100).
What is the rating of the Redmi K90 Ultra and the Vivo Y51?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Vivo Y51 — 40/100.
Which is more powerful: the Redmi K90 Ultra or the Vivo Y51?
The Redmi K90 Ultra leads on performance (92/100 vs 24/100).
Should you choose the Redmi K90 Ultra over the Vivo Y51?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.