Redmi K40 vs Redmi K90 Pro Max
The Redmi K40 (2021) runs on the Qualcomm Snapdragon 870, while the Redmi K90 Pro Max (2025) runs on the Qualcomm Snapdragon 8 Elite Gen 5; estimated prices are $309 and $561. By overall MobileRank rating, the Redmi K90 Pro Max leads — 86/100 vs 54/100 (a 32-point difference). Key differences: the Redmi K90 Pro Max has the bigger battery (7560 mAh vs 4520); the main camera is 48 MP vs 50 MP; the Redmi K90 Pro Max is faster in AnTuTu (4,119,955 vs 1,010,069).
Redmi K40
Redmi K90 Pro Max
- Lighter: 196g vs 210g
- Cheaper: $309 vs $561
- Better portability (64/100 vs 54/100)
- Higher AnTuTu: 4119955 vs 1010069
- Better Geekbench Single: 3640 vs 1298
- Better Geekbench Multi: 11033 vs 3520
- Bigger battery: 7560 vs 4520 mAh
- Faster charging: 100W vs 33W
- Better main camera: 50MP vs 48MP
- Higher performance (98/100 vs 61/100)
- Better camera (78/100 vs 36/100)
- Longer battery life (89/100 vs 42/100)
- Better display (81/100 vs 79/100)
Comparing the Redmi K40 vs the Redmi K90 Pro Max, the Redmi K90 Pro Max scores 32 points higher (86/100 vs 54/100). In the "performance" category, the Redmi K90 Pro Max leads (98/100 vs 61/100). In the "camera" category, the Redmi K90 Pro Max leads (78/100 vs 36/100). In the "battery" category, the Redmi K90 Pro Max leads (89/100 vs 42/100). In the "performance" category, the Redmi K90 Pro Max significantly outperforms the Redmi K40 (98/100 vs 61/100). In the "display" category, the Redmi K90 Pro Max and the Redmi K40 are nearly equal (81/100 vs 79/100). In the "camera" category, the Redmi K90 Pro Max significantly outperforms the Redmi K40 (78/100 vs 36/100). In the "battery" category, the Redmi K90 Pro Max significantly outperforms the Redmi K40 (89/100 vs 42/100). In the "portability" category, the Redmi K40 is a bit better (64/100 vs 54/100).
| Specification | Redmi K40 | Redmi K90 Pro Max | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 870 | Qualcomm Snapdragon 8 Elite Gen 5 | |
| AnTuTu | 1010069 | 4119955 | |
| Geekbench Single | 1298 | 3640 | |
| Geekbench Multi | 3520 | 11033 | |
| Display | 6.7" AMOLED | 6.9" OLED | |
| Resolution | 2400x1080 | 2608x1200 | |
| Refresh rate | 120 Hz | 120 Hz | |
| Battery | 4520 mAh | 7560 mAh | |
| Charging | 33W | 100W | |
| Wireless charging | — | 50W | |
| Main camera | 48 MP | 50 MP | |
| Ultrawide | 8 MP | 50 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 20 MP | 32 MP | |
| RAM | 6GB / 8GB / 12GB | 16GB | |
| Storage | 128GB / 256GB | 256GB / 512GB / 1TB | |
| OS | Android 11 | Android 16 | |
| Brightness (peak) | — | 3500 nits | |
| NFC | — | yes | |
| Protection | — | IP68 | |
| Dimensions | — | 163.3×77.8×7.9 mm | |
| Weight | 196 g | 210 g | |
| Price | $309 | $561 |
Redmi K40
- Main: 48MP f/1.79
- Ultrawide: 8MP
- Front: 20MP
Redmi K90 Pro Max
- Main: 50MP f/f/1.88
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Redmi K40
- 6.7" AMOLED
- Resolution: 2400x1080
- Refresh rate: 120 Hz
Redmi K90 Pro Max
- 6.9" OLED
- Resolution: 2608x1200
- Refresh rate: 120 Hz
Redmi K40
- 4520 mAh
- Wired: 33W
- Wireless charging: no data
Redmi K90 Pro Max
- 7560 mAh
- Wired: 100W
- Wireless: 50W
We compared Redmi K40 and Redmi K90 Pro Max, covering their specs and all relevant benchmarks.
Redmi K90 Pro Max leads Redmi K40 by 75.5% in our overall performance rating.
Price difference: $252. Redmi K40 is cheaper by $252.
performance
In the "performance" category, the Redmi K90 Pro Max significantly outperforms the Redmi K40 (98/100 vs 61/100).
display
In the "display" category, the Redmi K90 Pro Max and the Redmi K40 are nearly equal (81/100 vs 79/100).
camera
In the "camera" category, the Redmi K90 Pro Max significantly outperforms the Redmi K40 (78/100 vs 36/100).
battery
In the "battery" category, the Redmi K90 Pro Max significantly outperforms the Redmi K40 (89/100 vs 42/100).
portability
In the "portability" category, the Redmi K40 is a bit better (64/100 vs 54/100).
Which is better: the Redmi K40 or the Redmi K90 Pro Max?
The Redmi K90 Pro Max significantly outperforms the Redmi K40 by 32 points (86/100 vs 54/100).
What is the rating of the Redmi K40 and the Redmi K90 Pro Max?
The Redmi K40 has a MobileRank rating of 54/100, the Redmi K90 Pro Max — 86/100.
Which has the better camera: the Redmi K40 or the Redmi K90 Pro Max?
The Redmi K90 Pro Max leads on camera score (78/100 vs 36/100).
Which is more powerful: the Redmi K40 or the Redmi K90 Pro Max?
The Redmi K90 Pro Max leads on performance (98/100 vs 61/100).
Should you choose the Redmi K40 over the Redmi K90 Pro Max?
The Redmi K40 is a better fit for active users. The Redmi K90 Pro Max is a better fit for gamers and power users, those who care about battery life.