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).
Redmi K90 Ultra
Vivo Y51
- Higher AnTuTu: 3233695 vs 329457
- Better Geekbench Single: 3041 vs 321
- Better Geekbench Multi: 9494 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)
- Lighter: 186g vs 227g
- Better portability (59/100 vs 40/100)
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).
| Specification | Redmi K90 Ultra | Vivo Y51 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 665 | |
| AnTuTu | 3233695 | 329457 | |
| Geekbench Single | 3041 | 321 | |
| Geekbench Multi | 9494 | 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 | — |
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Vivo Y51
- Main: 48MP f/f/1.8
- Ultrawide: 8MP
- Front: 16MP
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Vivo Y51
- 6.4" Super AMOLED
- Resolution: 1080x2340
- Refresh rate: —
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Vivo Y51
- 5000 mAh
- Wired: 18W
- No wireless charging
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.
Vivo Y51
Price unknownperformance
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).
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, budget-conscious buyers. The Vivo Y51 is a better fit for everyday use.