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).
Profile comparison
Category scores
Redmi K40
Vivo X300 Ultra
What makes Redmi K40 better?
- Lighter: 196g vs 230g
- Cheaper at launch: $309 vs $950
- Better portability (64/100 vs 39/100)
What makes Vivo X300 Ultra better?
- Higher AnTuTu: 4247433 vs 1010069
- Better Geekbench Single: 3639 vs 1298
- Better Geekbench Multi: 11047 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)
Comparison verdict
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 — 46/100, Vivo X300 Ultra — 94/100; it shows how far a model sits above or below the usual level for its price, and is not part of the overall rating. 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).
Specs comparison
| Specification | Redmi K40 | Vivo X300 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 870 | Qualcomm Snapdragon 8 Elite Gen 5 | |
| AnTuTu | 1010069 | 4247433 | |
| Geekbench Single | 1298 | 3639 | |
| Geekbench Multi | 3520 | 11047 | |
| 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 | |
| Brightness (peak) | 1300 nits | — | |
| NFC | yes | yes | |
| Protection | — | IP69 | |
| Dimensions | 163.7×76.4×7.8 mm | 163.0×76.8×8.2 mm | |
| Weight | 196 g | 230 g | |
| Launch price | $309 | $950 |
Camera comparison
Redmi K40
- Main: 48MP f/1.79
- Ultrawide: 8MP
- Front: 20MP
Vivo X300 Ultra
- Main: 200MP f/1.6
- Ultrawide: 50MP
- Telephoto: 200MP
- Front: 32MP
Display comparison
Redmi K40
- 6.7" AMOLED
- Resolution: 2400x1080
- Refresh rate: 120 Hz
Vivo X300 Ultra
- 6.8" LTPO OLED
- Resolution: 3168x1440
- Refresh rate: 120 Hz
Battery and charging
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
Overall performance score
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.
Benchmarks
Launch prices and where to check today's
Launch price difference: $641. Redmi K40 was $641 cheaper at launch.
Detailed category analysis
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).
Frequently asked questions
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.