Realme C75x vs Redmi K90 Ultra
The Realme C75x (2025) runs on the MediaTek Helio G81 Ultra, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 39/100 (a 34-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 5600); the Redmi K90 Ultra is faster in AnTuTu (3,119,308 vs 358,383); the Redmi K90 Ultra has NFC for contactless payments, the Realme C75x doesn't; the Realme C75x is noticeably lighter (196g vs 227g).
Realme C75x
Redmi K90 Ultra
- Lighter: 196g vs 227g
- Better portability (62/100 vs 40/100)
- Higher AnTuTu: 3119308 vs 358383
- Better Geekbench Single: 3041 vs 432
- Better Geekbench Multi: 9494 vs 1416
- Bigger battery: 8550 vs 5600 mAh
- Faster charging: 100W vs 45W
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (92/100 vs 30/100)
- Better camera (37/100 vs 30/100)
- Longer battery life (78/100 vs 55/100)
- Better display (94/100 vs 55/100)
Comparing the Realme C75x vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 34 points higher (73/100 vs 39/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 30/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 55/100). In the "performance" category, the Redmi K90 Ultra significantly outperforms the Realme C75x (92/100 vs 30/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Realme C75x (94/100 vs 55/100). In the "camera" category, the Redmi K90 Ultra is a bit better (37/100 vs 30/100). In the "battery" category, the Redmi K90 Ultra notably outperforms the Realme C75x (78/100 vs 55/100). In the "portability" category, the Realme C75x notably outperforms the Redmi K90 Ultra (62/100 vs 40/100).
| Specification | Realme C75x | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | MediaTek Helio G81 Ultra | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 358383 | 3119308 | |
| Geekbench Single | 432 | 3041 | |
| Geekbench Multi | 1416 | 9494 | |
| Display | 6.7" IPS LCD | 6.8" AMOLED | |
| Resolution | 720x1604 | 1280x2772 | |
| Refresh rate | 120 Hz | 165 Hz | |
| Battery | 5600 mAh | 8550 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 | |
| OS | Android 15, Realme UI 6.0 | Android 16 | |
| Brightness (peak) | 625 nits | 3500 nits | |
| NFC | no | yes | |
| Protection | IP68 | IP68/IP69 | |
| Dimensions | 165.7×76.2×8.0 mm | 162.9×77.9×8.2 mm | |
| Weight | 196 g | 227 g | |
| Launch price | — | $420 |
Realme C75x
- Main: 50MP f/f/1.8
- Front: 5MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Realme C75x
- 6.7" IPS LCD
- Resolution: 720x1604
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Realme C75x
- 5600 mAh
- Wired: 45W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
We compared Realme C75x and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Realme C75x by 88.5% in our overall performance rating.
Realme C75x
Price unknownperformance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Realme C75x (92/100 vs 30/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Realme C75x (94/100 vs 55/100).
camera
In the "camera" category, the Redmi K90 Ultra is a bit better (37/100 vs 30/100).
battery
In the "battery" category, the Redmi K90 Ultra notably outperforms the Realme C75x (78/100 vs 55/100).
portability
In the "portability" category, the Realme C75x notably outperforms the Redmi K90 Ultra (62/100 vs 40/100).
Which is better: the Realme C75x or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the Realme C75x by 34 points (73/100 vs 39/100).
What is the rating of the Realme C75x and the Redmi K90 Ultra?
The Realme C75x has a MobileRank rating of 39/100, the Redmi K90 Ultra — 73/100.
Which has the better camera: the Realme C75x or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on camera score (37/100 vs 30/100).
Which is more powerful: the Realme C75x or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 30/100).
Should you choose the Realme C75x over the Redmi K90 Ultra?
The Realme C75x is a better fit for everyday use. The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.