Redmi K40S vs Xiaomi 17 Ultra (China)
The Redmi K40S (2022) runs on the Qualcomm Snapdragon 870 5G, while the Xiaomi 17 Ultra (China) (2025) runs on the Snapdragon 8 Elite Gen 5. By overall MobileRank rating, the Xiaomi 17 Ultra (China) leads — 87/100 vs 54/100 (a 33-point difference). Key differences: the Xiaomi 17 Ultra (China) has the bigger battery (6800 mAh vs 4500); the main camera is 48 MP vs 50 MP; the Xiaomi 17 Ultra (China) is faster in AnTuTu (3,950,082 vs 1,010,069); the Redmi K40S is noticeably lighter (195g vs 224g).
Profile comparison
Category scores
Redmi K40S
Xiaomi 17 Ultra (China)
What makes Redmi K40S better?
- Lighter: 195g vs 224g
- Better portability (65/100 vs 42/100)
What makes Xiaomi 17 Ultra (China) better?
- Higher AnTuTu: 3950082 vs 1010069
- Better Geekbench Single: 3639 vs 1298
- Better Geekbench Multi: 11047 vs 3520
- Bigger battery: 6800 vs 4500 mAh
- Faster charging: 90W vs 67W
- Better main camera: 50MP vs 48MP
- Higher performance (98/100 vs 61/100)
- Better camera (87/100 vs 36/100)
- Longer battery life (83/100 vs 42/100)
- Better display (81/100 vs 79/100)
Comparison verdict
Comparing the Redmi K40S vs the Xiaomi 17 Ultra (China), the Xiaomi 17 Ultra (China) scores 33 points higher (87/100 vs 54/100). In the "performance" category, the Xiaomi 17 Ultra (China) leads (98/100 vs 61/100). In the "camera" category, the Xiaomi 17 Ultra (China) leads (87/100 vs 36/100). In the "battery" category, the Xiaomi 17 Ultra (China) leads (83/100 vs 42/100). In the "performance" category, the Xiaomi 17 Ultra (China) significantly outperforms the Redmi K40S (98/100 vs 61/100). In the "display" category, the Xiaomi 17 Ultra (China) and the Redmi K40S are nearly equal (81/100 vs 79/100). In the "camera" category, the Xiaomi 17 Ultra (China) significantly outperforms the Redmi K40S (87/100 vs 36/100). In the "battery" category, the Xiaomi 17 Ultra (China) significantly outperforms the Redmi K40S (83/100 vs 42/100). In the "portability" category, the Redmi K40S notably outperforms the Xiaomi 17 Ultra (China) (65/100 vs 42/100).
Specs comparison
| Specification | Redmi K40S | Xiaomi 17 Ultra (China) | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 870 5G | Snapdragon 8 Elite Gen 5 | |
| AnTuTu | 1010069 | 3950082 | |
| Geekbench Single | 1298 | 3639 | |
| Geekbench Multi | 3520 | 11047 | |
| Display | 6.7" AMOLED | 6.9" LTPO AMOLED | |
| Resolution | 1080x2400 | 1200x2608 | |
| Refresh rate | 120 Hz | 120 Hz | |
| Battery | 4500 mAh | 6800 mAh | |
| Charging | 67W | 90W | |
| Wireless charging | 0W | 50W | |
| Main camera | 48 MP | 50 MP | |
| Ultrawide | 8 MP | 50 MP | |
| Telephoto | 0 MP | 200 MP | |
| Front camera | 20 MP | 50 MP | |
| RAM | 6GB / 8GB / 12GB | 12GB / 16GB | |
| Storage | 128GB / 256GB | 512GB / 1TB | |
| OS | Android 12, MIUI 13 | Android 16 | |
| Brightness (peak) | 1300 nits | — | |
| NFC | yes | yes | |
| Protection | — | IP68/IP69 | |
| Dimensions | 163.2×76.0×7.7 mm | 162.9×77.6×8.3 mm | |
| Weight | 195 g | 224 g | |
| Launch price | — | $892 |
Camera comparison
Redmi K40S
- Main: 48MP f/1.8
- Ultrawide: 8MP
- Front: 20MP
Xiaomi 17 Ultra (China)
- Main: 50MP f/1.7
- Ultrawide: 50MP
- Telephoto: 200MP
- Front: 50MP
Display comparison
Redmi K40S
- 6.7" AMOLED
- Resolution: 1080x2400
- Refresh rate: 120 Hz
Xiaomi 17 Ultra (China)
- 6.9" LTPO AMOLED
- Resolution: 1200x2608
- Refresh rate: 120 Hz
Battery and charging
Redmi K40S
- 4500 mAh
- Wired: 67W
- No wireless charging
Xiaomi 17 Ultra (China)
- 6800 mAh
- Wired: 90W
- Wireless: 50W
Overall performance score
We compared Redmi K40S and Xiaomi 17 Ultra (China), covering their specs and all relevant benchmarks.
Xiaomi 17 Ultra (China) leads Redmi K40S by 74.4% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Redmi K40S
Price unknownDetailed category analysis
performance
In the "performance" category, the Xiaomi 17 Ultra (China) significantly outperforms the Redmi K40S (98/100 vs 61/100).
display
In the "display" category, the Xiaomi 17 Ultra (China) and the Redmi K40S are nearly equal (81/100 vs 79/100).
camera
In the "camera" category, the Xiaomi 17 Ultra (China) significantly outperforms the Redmi K40S (87/100 vs 36/100).
battery
In the "battery" category, the Xiaomi 17 Ultra (China) significantly outperforms the Redmi K40S (83/100 vs 42/100).
portability
In the "portability" category, the Redmi K40S notably outperforms the Xiaomi 17 Ultra (China) (65/100 vs 42/100).
Frequently asked questions
Which is better: the Redmi K40S or the Xiaomi 17 Ultra (China)?
The Xiaomi 17 Ultra (China) significantly outperforms the Redmi K40S by 33 points (87/100 vs 54/100).
What is the rating of the Redmi K40S and the Xiaomi 17 Ultra (China)?
The Redmi K40S has a MobileRank rating of 54/100, the Xiaomi 17 Ultra (China) — 87/100.
Which has the better camera: the Redmi K40S or the Xiaomi 17 Ultra (China)?
The Xiaomi 17 Ultra (China) leads on camera score (87/100 vs 36/100).
Which is more powerful: the Redmi K40S or the Xiaomi 17 Ultra (China)?
The Xiaomi 17 Ultra (China) leads on performance (98/100 vs 61/100).
Should you choose the Redmi K40S over the Xiaomi 17 Ultra (China)?
The Redmi K40S is a better fit for active users. The Xiaomi 17 Ultra (China) is a better fit for gamers and power users, mobile photography enthusiasts, those who care about battery life, budget-conscious buyers.