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 (3,233,695 vs 358,608); the Redmi K90 Ultra has NFC for contactless payments, the Realme C75x doesn't; the Realme C75x is noticeably lighter (196g vs 227g).
Profile comparison
Category scores
Realme C75x
Redmi K90 Ultra
What makes Realme C75x better?
- Lighter: 196g vs 227g
- Better portability (62/100 vs 40/100)
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 358608
- Better Geekbench Single: 3013 vs 432
- Better Geekbench Multi: 9287 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)
Comparison verdict
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).
Specs comparison
| Specification | Realme C75x | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | MediaTek Helio G81 Ultra | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 358608 | 3233695 | |
| Geekbench Single | 432 | 3013 | |
| Geekbench Multi | 1416 | 9287 | |
| 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 |
Camera comparison
Realme C75x
- Main: 50MP f/1.8
- Front: 5MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
Realme C75x
- 6.7" IPS LCD
- Resolution: 720x1604
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
Realme C75x
- 5600 mAh
- Wired: 45W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared Realme C75x and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Realme C75x by 88.9% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Realme C75x
Price unknownDetailed category analysis
performance
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).
Frequently asked questions
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 Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.