Realme C75x vs Redmi K80 Ultra
The Realme C75x (2025) runs on the MediaTek Helio G81 Ultra, while the Redmi K80 Ultra (2025) runs on the MediaTek Dimensity 9400+. By overall MobileRank rating, the Redmi K80 Ultra leads — 60/100 vs 31/100 (a 29-point difference). Key differences: the Redmi K80 Ultra has the bigger battery (7410 mAh vs 5600); the Redmi K80 Ultra is faster in AnTuTu (2,876,004 vs 358,383); the Redmi K80 Ultra has NFC for contactless payments, the Realme C75x doesn't; the Realme C75x is noticeably lighter (196g vs 219g).
Realme C75x
Redmi K80 Ultra
- Lighter: 196g vs 219g
- Better design/ergonomics (55/100 vs 26/100)
- Higher AnTuTu: 2876004 vs 358383
- Better Geekbench Single: 2729 vs 432
- Better Geekbench Multi: 8430 vs 1416
- Bigger battery: 7410 vs 5600 mAh
- Faster charging: 100W vs 45W
- Higher refresh rate: 144Hz vs 120Hz
- Higher performance (61/100 vs 0/100)
- Better camera (32/100 vs 24/100)
- Longer battery life (72/100 vs 50/100)
- Better value for money (86/100 vs 55/100)
Comparing the Realme C75x vs the Redmi K80 Ultra, the Redmi K80 Ultra scores 29 points higher (60/100 vs 31/100). In the "performance" category, the Redmi K80 Ultra leads (61/100 vs 0/100). In the "battery" category, the Redmi K80 Ultra leads (72/100 vs 50/100). In the "value for money" category, the Redmi K80 Ultra leads (86/100 vs 55/100). In the "performance" category, the Redmi K80 Ultra significantly outperforms the Realme C75x (61/100 vs 0/100). In the "display" category, both devices are on the same level — 100/100. In the "camera" category, the Redmi K80 Ultra is a bit better (32/100 vs 24/100). In the "battery" category, the Redmi K80 Ultra notably outperforms the Realme C75x (72/100 vs 50/100). In the "design" category, the Realme C75x notably outperforms the Redmi K80 Ultra (55/100 vs 26/100). In the "value for money" category, the Redmi K80 Ultra significantly outperforms the Realme C75x (86/100 vs 55/100).
| Specification | Realme C75x | Redmi K80 Ultra | |
|---|---|---|---|
| Processor | MediaTek Helio G81 Ultra | MediaTek Dimensity 9400+ | |
| AnTuTu | 358383 | 2876004 | |
| Geekbench Single | 432 | 2729 | |
| Geekbench Multi | 1416 | 8430 | |
| Display | 6.7" IPS LCD | 6.8" OLED | |
| Resolution | 720x1604 | 1280x2772 | |
| Refresh rate | 120 Hz | 144 Hz | |
| Battery | 5600 mAh | 7410 mAh | |
| Charging | 45W | 100W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 0 MP | 8 MP | |
| Front camera | 5 MP | 20 MP | |
| RAM | 8GB | 12GB / 16GB | |
| Storage | 128GB | 256GB / 512GB / 1TB | |
| OS | Android 15, Realme UI 6.0 | Android 15 | |
| Brightness (peak) | 625 nits | 3200 nits | |
| NFC | no | yes | |
| Protection | IP68 | IP68 | |
| Dimensions | 165.7×76.2×8.0 mm | — | |
| Weight | 196 g | 219 g | |
| Price | — | $350 |
Realme C75x
- Main: 50MP f/f/1.8
- Front: 5MP
Redmi K80 Ultra
- Main: 50MP f/f/1.9
- Ultrawide: 8MP
- Front: 20MP
Realme C75x
- 6.7" IPS LCD
- Resolution: 720x1604
- Refresh rate: 120 Hz
Redmi K80 Ultra
- 6.8" OLED
- Resolution: 1280x2772
- Refresh rate: 144 Hz
Realme C75x
- 5600 mAh
- Wired: 45W
- No wireless charging
Redmi K80 Ultra
- 7410 mAh
- Wired: 100W
- No wireless charging
We compared Realme C75x and Redmi K80 Ultra, covering their specs and all relevant benchmarks.
Redmi K80 Ultra leads Realme C75x by 87.5% in our overall performance rating.
Realme C75x
Price unknownperformance
In the "performance" category, the Redmi K80 Ultra significantly outperforms the Realme C75x (61/100 vs 0/100).
display
In the "display" category, both devices are on the same level — 100/100.
camera
In the "camera" category, the Redmi K80 Ultra is a bit better (32/100 vs 24/100).
battery
In the "battery" category, the Redmi K80 Ultra notably outperforms the Realme C75x (72/100 vs 50/100).
design
In the "design" category, the Realme C75x notably outperforms the Redmi K80 Ultra (55/100 vs 26/100).
value for money
In the "value for money" category, the Redmi K80 Ultra significantly outperforms the Realme C75x (86/100 vs 55/100).
Which is better: the Realme C75x or the Redmi K80 Ultra?
The Redmi K80 Ultra significantly outperforms the Realme C75x by 29 points (60/100 vs 31/100).
What is the rating of the Realme C75x and the Redmi K80 Ultra?
The Realme C75x has a MobileRank rating of 31/100, the Redmi K80 Ultra — 60/100.
Which has the better camera: the Realme C75x or the Redmi K80 Ultra?
The Redmi K80 Ultra leads on camera score (32/100 vs 24/100).
Which is more powerful: the Realme C75x or the Redmi K80 Ultra?
The Redmi K80 Ultra leads on performance (61/100 vs 0/100).
Should you choose the Realme C75x over the Redmi K80 Ultra?
The Realme C75x is a better fit for everyday use. The Redmi K80 Ultra is a better fit for active users, budget-conscious buyers.