Redmi K90 vs Samsung Galaxy A51
The Redmi K90 (2025) runs on the Qualcomm Snapdragon 8 Elite, while the Samsung Galaxy A51 (2020) runs on the Exynos 9611; estimated prices are $401 and $399. By overall MobileRank rating, the Redmi K90 leads — 68/100 vs 18/100 (a 50-point difference). Key differences: the Redmi K90 has the bigger battery (7100 mAh vs 4000); the main camera is 50 MP vs 48 MP; the Redmi K90 is faster in AnTuTu (3,088,357 vs 355,351); the Samsung Galaxy A51 is noticeably lighter (172g vs 206g).
Redmi K90
Samsung Galaxy A51
- Higher AnTuTu: 3088357 vs 355351
- Better Geekbench Single: 3050 vs 365
- Better Geekbench Multi: 9300 vs 1107
- Bigger battery: 7100 vs 4000 mAh
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 120Hz vs 60Hz
- Higher performance (69/100 vs 0/100)
- Better camera (53/100 vs 32/100)
- Longer battery life (71/100 vs 12/100)
- Better display (100/100 vs 0/100)
- Lighter: 172g vs 206g
- Cheaper: $399 vs $401
- Better design/ergonomics (85/100 vs 42/100)
Comparing the Redmi K90 vs the Samsung Galaxy A51, the Redmi K90 scores 50 points higher (68/100 vs 18/100). In the "performance" category, the Redmi K90 leads (69/100 vs 0/100). In the "camera" category, the Redmi K90 leads (53/100 vs 32/100). In the "battery" category, the Redmi K90 leads (71/100 vs 12/100). In the "performance" category, the Redmi K90 significantly outperforms the Samsung Galaxy A51 (69/100 vs 0/100). In the "display" category, the Redmi K90 significantly outperforms the Samsung Galaxy A51 (100/100 vs 0/100). In the "camera" category, the Redmi K90 notably outperforms the Samsung Galaxy A51 (53/100 vs 32/100). In the "battery" category, the Redmi K90 significantly outperforms the Samsung Galaxy A51 (71/100 vs 12/100). In the "design" category, the Samsung Galaxy A51 significantly outperforms the Redmi K90 (85/100 vs 42/100). In the "value for money" category, both devices are on the same level — 82/100.
| Specification | Redmi K90 | Samsung Galaxy A51 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Exynos 9611 | |
| AnTuTu | 3088357 | 355351 | |
| Geekbench Single | 3050 | 365 | |
| Geekbench Multi | 9300 | 1107 | |
| Display | 6.6" AMOLED | 6.5" AMOLED | |
| Resolution | 2510x1156 | — | |
| Refresh rate | 120 Hz | 60 Hz | |
| Battery | 7100 mAh | 4000 mAh | |
| Charging | 100W | — | |
| Main camera | 50 MP | 48 MP | |
| Ultrawide | 8 MP | 0 MP | |
| Telephoto | 50 MP | 0 MP | |
| Front camera | 20 MP | 32 MP | |
| RAM | 12GB / 16GB | 4GB / 6GB | |
| Storage | 256GB / 512GB | 64GB / 128GB | |
| OS | Android 16 | — | |
| Brightness (peak) | 3500 nits | — | |
| NFC | yes | yes | |
| Protection | IP68 | — | |
| Dimensions | 157.5×75.3×8.0 mm | 158.5×73.6×7.9 mm | |
| Weight | 206 g | 172 g | |
| Price | $401 | $399 |
Redmi K90
- Main: 50MP f/f/1.9
- Ultrawide: 8MP
- Telephoto: 50MP
- Front: 20MP
Samsung Galaxy A51
- Main: 48MP
- Front: 32MP
Redmi K90
- 6.6" AMOLED
- Resolution: 2510x1156
- Refresh rate: 120 Hz
Samsung Galaxy A51
- 6.5" AMOLED
- Refresh rate: 60 Hz
Redmi K90
- 7100 mAh
- Wired: 100W
- No wireless charging
Samsung Galaxy A51
- 4000 mAh
- No wireless charging
We compared Redmi K90 and Samsung Galaxy A51, covering their specs and all relevant benchmarks.
Redmi K90 leads Samsung Galaxy A51 by 769.1% in our overall performance rating.
Price difference: $2. Samsung Galaxy A51 is cheaper by $2.
performance
In the "performance" category, the Redmi K90 significantly outperforms the Samsung Galaxy A51 (69/100 vs 0/100).
display
In the "display" category, the Redmi K90 significantly outperforms the Samsung Galaxy A51 (100/100 vs 0/100).
camera
In the "camera" category, the Redmi K90 notably outperforms the Samsung Galaxy A51 (53/100 vs 32/100).
battery
In the "battery" category, the Redmi K90 significantly outperforms the Samsung Galaxy A51 (71/100 vs 12/100).
design
In the "design" category, the Samsung Galaxy A51 significantly outperforms the Redmi K90 (85/100 vs 42/100).
value for money
In the "value for money" category, both devices are on the same level — 82/100.
Which is better: the Redmi K90 or the Samsung Galaxy A51?
The Redmi K90 significantly outperforms the Samsung Galaxy A51 by 50 points (68/100 vs 18/100).
What is the rating of the Redmi K90 and the Samsung Galaxy A51?
The Redmi K90 has a MobileRank rating of 68/100, the Samsung Galaxy A51 — 18/100.
Which has the better camera: the Redmi K90 or the Samsung Galaxy A51?
The Redmi K90 leads on camera score (53/100 vs 32/100).
Which is more powerful: the Redmi K90 or the Samsung Galaxy A51?
The Redmi K90 leads on performance (69/100 vs 0/100).
Should you choose the Redmi K90 over the Samsung Galaxy A51?
The Redmi K90 is a better fit for active users, budget-conscious buyers. The Samsung Galaxy A51 is a better fit for budget-conscious buyers.