Redmi K40 vs Vivo X300 Ultra
The Redmi K40 (2021) runs on the Qualcomm Snapdragon 870, while the Vivo X300 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite Gen 5; launch prices were $309 and $950. By overall MobileRank rating, the Vivo X300 Ultra leads — 91/100 vs 54/100 (a 37-point difference). Key differences: the Vivo X300 Ultra has the bigger battery (7000 mAh vs 4520); the main camera is 48 MP vs 200 MP; the Vivo X300 Ultra is faster in AnTuTu (4,247,433 vs 1,010,069); the Redmi K40 is noticeably lighter (196g vs 230g).
Redmi K40
Vivo X300 Ultra
- Lighter: 196g vs 230g
- Cheaper at launch: $309 vs $950
- Better portability (64/100 vs 39/100)
- Higher AnTuTu: 4247433 vs 1010069
- Better Geekbench Single: 3640 vs 1298
- Better Geekbench Multi: 11033 vs 3520
- Bigger battery: 7000 vs 4520 mAh
- Faster charging: 100W vs 33W
- Better main camera: 200MP vs 48MP
- Higher performance (99/100 vs 61/100)
- Better camera (96/100 vs 36/100)
- Longer battery life (85/100 vs 42/100)
- Better display (89/100 vs 79/100)
Comparing the Redmi K40 vs the Vivo X300 Ultra, the Vivo X300 Ultra scores 37 points higher (91/100 vs 54/100). In the "performance" category, the Vivo X300 Ultra leads (99/100 vs 61/100). In the "camera" category, the Vivo X300 Ultra leads (96/100 vs 36/100). In the "battery" category, the Vivo X300 Ultra leads (85/100 vs 42/100). Value score: Redmi K40 — 50/100, Vivo X300 Ultra — 94/100; it is biased by price level, so it should not be compared directly between devices at different prices. In the "performance" category, the Vivo X300 Ultra significantly outperforms the Redmi K40 (99/100 vs 61/100). In the "display" category, the Vivo X300 Ultra is a bit better (89/100 vs 79/100). In the "camera" category, the Vivo X300 Ultra significantly outperforms the Redmi K40 (96/100 vs 36/100). In the "battery" category, the Vivo X300 Ultra significantly outperforms the Redmi K40 (85/100 vs 42/100). In the "portability" category, the Redmi K40 notably outperforms the Vivo X300 Ultra (64/100 vs 39/100).
| Specification | Redmi K40 | Vivo X300 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 870 | Qualcomm Snapdragon 8 Elite Gen 5 | |
| AnTuTu | 1010069 | 4247433 | |
| Geekbench Single | 1298 | 3640 | |
| Geekbench Multi | 3520 | 11033 | |
| Display | 6.7" AMOLED | 6.8" LTPO OLED | |
| Resolution | 2400x1080 | 3168x1440 | |
| Refresh rate | 120 Hz | 120 Hz | |
| Battery | 4520 mAh | 7000 mAh | |
| Charging | 33W | 100W | |
| Wireless charging | — | 40W | |
| DXOMark (camera) | — | 170 | |
| Main camera | 48 MP | 200 MP | |
| Ultrawide | 8 MP | 50 MP | |
| Telephoto | 0 MP | 200 MP | |
| Front camera | 20 MP | 32 MP | |
| RAM | 6GB / 8GB / 12GB | 12GB / 16GB | |
| Storage | 128GB / 256GB | 256GB / 512GB / 1TB | |
| OS | Android 11 | Android 16 | |
| NFC | — | yes | |
| Protection | — | IP69 | |
| Dimensions | — | 163.0×76.8×8.2 mm | |
| Weight | 196 g | 230 g | |
| Launch price | $309 | $950 |
Redmi K40
- Main: 48MP f/1.79
- Ultrawide: 8MP
- Front: 20MP
Vivo X300 Ultra
- Main: 200MP f/f/1.6
- Ultrawide: 50MP
- Telephoto: 200MP
- Front: 32MP
Redmi K40
- 6.7" AMOLED
- Resolution: 2400x1080
- Refresh rate: 120 Hz
Vivo X300 Ultra
- 6.8" LTPO OLED
- Resolution: 3168x1440
- Refresh rate: 120 Hz
Redmi K40
- 4520 mAh
- Wired: 33W
- Wireless charging: no data
Vivo X300 Ultra
- 7000 mAh
- NanoReview test: web browsing 10:18 hrs, total 29:11 hrs
- Wired: 100W
- Wireless: 40W
We compared Redmi K40 and Vivo X300 Ultra, covering their specs and all relevant benchmarks.
Vivo X300 Ultra leads Redmi K40 by 76.2% in our overall performance rating.
Launch price difference: $641. Redmi K40 was $641 cheaper at launch.
performance
In the "performance" category, the Vivo X300 Ultra significantly outperforms the Redmi K40 (99/100 vs 61/100).
display
In the "display" category, the Vivo X300 Ultra is a bit better (89/100 vs 79/100).
camera
In the "camera" category, the Vivo X300 Ultra significantly outperforms the Redmi K40 (96/100 vs 36/100).
battery
In the "battery" category, the Vivo X300 Ultra significantly outperforms the Redmi K40 (85/100 vs 42/100).
portability
In the "portability" category, the Redmi K40 notably outperforms the Vivo X300 Ultra (64/100 vs 39/100).
Which is better: the Redmi K40 or the Vivo X300 Ultra?
The Vivo X300 Ultra significantly outperforms the Redmi K40 by 37 points (91/100 vs 54/100).
What is the rating of the Redmi K40 and the Vivo X300 Ultra?
The Redmi K40 has a MobileRank rating of 54/100, the Vivo X300 Ultra — 91/100.
Which has the better camera: the Redmi K40 or the Vivo X300 Ultra?
The Vivo X300 Ultra leads on camera score (96/100 vs 36/100).
Which is more powerful: the Redmi K40 or the Vivo X300 Ultra?
The Vivo X300 Ultra leads on performance (99/100 vs 61/100).
Should you choose the Redmi K40 over the Vivo X300 Ultra?
The Redmi K40 is a better fit for active users. The Vivo X300 Ultra is a better fit for gamers and power users, mobile photography enthusiasts, those who care about battery life, budget-conscious buyers.