Xiaomi POCO C85 128GB vs realme RMX 3780 256GB: which one suits you?
The two differ in 9 of the specs we have recorded, and the Xiaomi POCO C85 128GB is cheaper by SAR 226 (prices checked 9 Nov 2026).
Which one should you choose?
Choose the
Xiaomi POCO C85 128GB if you care about:- Paying less: cheaper by SAR 226
- More memory for multitasking (16 GB vs 8 GB)
- Bigger battery for a longer day (6,000 mAh vs 5,000 mAh)
Choose the
realme RMX 3780 256GB if you care about:- More space for photos and apps (256 GB vs 128 GB)
- Higher-resolution main camera (100 MP vs 50 MP)
- Lower weight: 190 g vs 214 g · slight difference
The deciding difference here: storage and memory (RAM) and price.
Compares recorded specs; a missing spec does not mean the feature is absent.
Key differences
Storage
128 GB✓ 256 GBMemory (RAM)
✓ 16 GB8 GBScreen size
6.9 in6.72 in
Specifications side by side
21 of 21 specs
Scroll the table sideways to see the rest.
| Spec | | |
|---|---|---|
| Reference price | SAR 555 | SAR 781 |
| Storage | 128 GB | ✓ 256 GB |
| Memory (RAM) | ✓ 16 GB | 8 GB |
| Processor | Helio G81 Ultra | — |
| Battery capacity | ✓ 6,000 mAh | 5,000 mAh |
| Wired charging | 33 W | — |
| Main camera | 50 MP | ✓ 100 MP |
| 5G | — | Yes |
| Years of OS updates | 2 years | — |
| Front camera | 8 MP | — |
| Screen size | 6.9 in | 6.72 in |
| Display type | AMOLED | LCD |
| Resolution | 720 x 1600 | 1080 x 2400 |
| Screen refresh rate | 120 Hz | 120 Hz |
| Wireless charging | No | — |
| Dual SIM | Yes | — |
| Water and dust rating | IP64 | — |
| Operating system | — | Android 13.0 |
| Release year | 2025 | 2023 |
| Colour | Green | — |
| Weight | 214 g | ✓ 190 g |
| Warranty | 2 years | 2 years |
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Direct comparison questions
What is the difference in storage between the Xiaomi POCO C85 128GB and the realme RMX 3780 256GB?
Storage is higher on the realme RMX 3780 256GB: 256 GB vs 128 GB on the Xiaomi POCO C85 128GB. If this spec is your priority, the difference favours it.
What is the difference in main camera between the Xiaomi POCO C85 128GB and the realme RMX 3780 256GB?
Main camera is higher on the realme RMX 3780 256GB: 100 MP vs 50 MP on the Xiaomi POCO C85 128GB. If this spec is your priority, the difference favours it.
What is the difference in battery capacity between the Xiaomi POCO C85 128GB and the realme RMX 3780 256GB?
Battery capacity is higher on the Xiaomi POCO C85 128GB: 6,000 mAh vs 5,000 mAh on the realme RMX 3780 256GB. If this spec is your priority, the difference favours it.
What is the difference in memory (RAM) between the Xiaomi POCO C85 128GB and the realme RMX 3780 256GB?
Memory (RAM) is higher on the Xiaomi POCO C85 128GB: 16 GB vs 8 GB on the realme RMX 3780 256GB. If this spec is your priority, the difference favours it.