Vivo iQOO 15 Ultra vs Vivo X300
The Vivo iQOO 15 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite Gen 5, while the Vivo X300 (2024) runs on the MediaTek Dimensity 9300; launch prices were $799 and $499. By overall MobileRank rating, the Vivo iQOO 15 Ultra leads — 89/100 vs 78/100 (a 11-point difference). Key differences: the Vivo iQOO 15 Ultra has the bigger battery (7400 mAh vs 5000); the Vivo iQOO 15 Ultra is faster in AnTuTu (4,602,290 vs 2,555,121); the Vivo X300 is noticeably lighter (206g vs 227g).
Vivo iQOO 15 Ultra
Vivo X300
- Higher AnTuTu: 4602290 vs 2555121
- Better Geekbench Single: 3640 vs 2142
- Better Geekbench Multi: 11033 vs 7125
- Bigger battery: 7400 vs 5000 mAh
- Faster charging: 120W vs 80W
- Higher refresh rate: 144Hz vs 120Hz
- Faster wireless charging: 50W vs 40W
- Higher performance (99/100 vs 83/100)
- Longer battery life (92/100 vs 69/100)
- Better display (99/100 vs 84/100)
- Lighter: 206g vs 227g
- Cheaper at launch: $499 vs $799
- Better portability (55/100 vs 35/100)
Comparing the Vivo iQOO 15 Ultra vs the Vivo X300, the Vivo iQOO 15 Ultra scores 11 points higher (89/100 vs 78/100). In the "performance" category, the Vivo iQOO 15 Ultra leads (99/100 vs 83/100). In the "battery" category, the Vivo iQOO 15 Ultra leads (92/100 vs 69/100). Value score: Vivo iQOO 15 Ultra — 90/100, Vivo X300 — 82/100; it is biased by price level, so it should not be compared directly between devices at different prices. In the "performance" category, the Vivo iQOO 15 Ultra notably outperforms the Vivo X300 (99/100 vs 83/100). In the "display" category, the Vivo iQOO 15 Ultra notably outperforms the Vivo X300 (99/100 vs 84/100). In the "camera" category, both devices are on the same level — 78/100. In the "battery" category, the Vivo iQOO 15 Ultra notably outperforms the Vivo X300 (92/100 vs 69/100). In the "portability" category, the Vivo X300 notably outperforms the Vivo iQOO 15 Ultra (55/100 vs 35/100).
| Specification | Vivo iQOO 15 Ultra | Vivo X300 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite Gen 5 | MediaTek Dimensity 9300 | |
| AnTuTu | 4602290 | 2555121 | |
| Geekbench Single | 3640 | 2142 | |
| Geekbench Multi | 11033 | 7125 | |
| Display | 6.8" LTPO AMOLED | 6.8" AMOLED | |
| Resolution | 1440x3168 | 2800x1260 | |
| Refresh rate | 144 Hz | 120 Hz | |
| Battery | 7400 mAh | 5000 mAh | |
| Charging | 120W | 80W | |
| Wireless charging | 50W | 40W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 50 MP | 50 MP | |
| Telephoto | 50 MP | 50 MP | |
| Front camera | 32 MP | 32 MP | |
| RAM | 12GB / 16GB / 24GB | 12GB / 16GB | |
| Storage | 256GB / 512GB / 1TB | 256GB / 512GB | |
| OS | Android 16 | Android 14 | |
| Brightness (peak) | 8000 nits | 4500 nits | |
| NFC | yes | yes | |
| Protection | IP68 | IP68 | |
| Dimensions | 163.7×76.8×8.7 mm | 150.6×71.9×8.0 mm | |
| Weight | 227 g | 206 g | |
| Launch price | $799 | $499 |
Vivo iQOO 15 Ultra
- Main: 50MP f/f/1.9
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Vivo X300
- Main: 50MP f/f/1.57
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Vivo iQOO 15 Ultra
- 6.8" LTPO AMOLED
- Resolution: 1440x3168
- Refresh rate: 144 Hz
Vivo X300
- 6.8" AMOLED
- Resolution: 2800x1260
- Refresh rate: 120 Hz
Vivo iQOO 15 Ultra
- 7400 mAh
- Wired: 120W
- Wireless: 50W
Vivo X300
- 5000 mAh
- Wired: 80W
- Wireless: 40W
We compared Vivo iQOO 15 Ultra and Vivo X300, covering their specs and all relevant benchmarks.
Vivo iQOO 15 Ultra leads Vivo X300 by 80.1% in our overall performance rating.
Launch price difference: $300. Vivo X300 was $300 cheaper at launch.
performance
In the "performance" category, the Vivo iQOO 15 Ultra notably outperforms the Vivo X300 (99/100 vs 83/100).
display
In the "display" category, the Vivo iQOO 15 Ultra notably outperforms the Vivo X300 (99/100 vs 84/100).
camera
In the "camera" category, both devices are on the same level — 78/100.
battery
In the "battery" category, the Vivo iQOO 15 Ultra notably outperforms the Vivo X300 (92/100 vs 69/100).
portability
In the "portability" category, the Vivo X300 notably outperforms the Vivo iQOO 15 Ultra (55/100 vs 35/100).
Which is better: the Vivo iQOO 15 Ultra or the Vivo X300?
The Vivo iQOO 15 Ultra is noticeably better than the Vivo X300 — the overall rating gap is 11 points.
What is the rating of the Vivo iQOO 15 Ultra and the Vivo X300?
The Vivo iQOO 15 Ultra has a MobileRank rating of 89/100, the Vivo X300 — 78/100.
Which is more powerful: the Vivo iQOO 15 Ultra or the Vivo X300?
The Vivo iQOO 15 Ultra leads on performance (99/100 vs 83/100).
Should you choose the Vivo iQOO 15 Ultra over the Vivo X300?
The Vivo iQOO 15 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers. The Vivo X300 is a better fit for gamers and power users, budget-conscious buyers.