ASUS Zenfone 6 ZS630KL vs Redmi K90 Ultra
The ASUS Zenfone 6 ZS630KL (2019) runs on the Qualcomm Snapdragon 855, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $499 and $420. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 47/100 (a 26-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 5000); the main camera is 48 MP vs 50 MP; the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 824,513); the ASUS Zenfone 6 ZS630KL is noticeably lighter (190g vs 227g).
Profile comparison
Category scores
ASUS Zenfone 6 ZS630KL
Redmi K90 Ultra
What makes ASUS Zenfone 6 ZS630KL better?
- Lighter: 190g vs 227g
- Better camera (44/100 vs 37/100)
- Better portability (52/100 vs 40/100)
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 824513
- Better Geekbench Single: 3013 vs 968
- Better Geekbench Multi: 9287 vs 2731
- Bigger battery: 8550 vs 5000 mAh
- Faster charging: 100W vs 18W
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 165Hz vs 60Hz
- Cheaper at launch: $420 vs $499
- Higher performance (92/100 vs 54/100)
- Longer battery life (78/100 vs 43/100)
- Better display (94/100 vs 43/100)
Comparison verdict
Comparing the ASUS Zenfone 6 ZS630KL vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 26 points higher (73/100 vs 47/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 54/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 43/100). Value score: ASUS Zenfone 6 ZS630KL — 16/100, Redmi K90 Ultra — 72/100; it shows how far a model sits above or below the usual level for its price, and is not part of the overall rating. In the "performance" category, the Redmi K90 Ultra significantly outperforms the ASUS Zenfone 6 ZS630KL (92/100 vs 54/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the ASUS Zenfone 6 ZS630KL (94/100 vs 43/100). In the "camera" category, the ASUS Zenfone 6 ZS630KL is a bit better (44/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the ASUS Zenfone 6 ZS630KL (78/100 vs 43/100). In the "portability" category, the ASUS Zenfone 6 ZS630KL is a bit better (52/100 vs 40/100).
Specs comparison
| Specification | ASUS Zenfone 6 ZS630KL | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 855 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 824513 | 3233695 | |
| Geekbench Single | 968 | 3013 | |
| Geekbench Multi | 2731 | 9287 | |
| Display | 6.4" IPS LCD | 6.8" AMOLED | |
| Resolution | 1080x2340 | 1280x2772 | |
| Refresh rate | 60 Hz | 165 Hz | |
| Battery | 5000 mAh | 8550 mAh | |
| Charging | 18W | 100W | |
| Main camera | 48 MP | 50 MP | |
| Ultrawide | 13 MP | 8 MP | |
| Front camera | 48 MP | 20 MP | |
| RAM | 6GB / 8GB / 12GB | 12GB / 16GB | |
| Storage | 64GB / 128GB / 256GB / 512GB | 256GB / 512GB | |
| OS | Android 9.0 / ZenUI | Android 16 | |
| Brightness (peak) | — | 3500 nits | |
| NFC | yes | yes | |
| Protection | — | IP68/IP69 | |
| Dimensions | 159.1×75.4×9.2 mm | 162.9×77.9×8.2 mm | |
| Weight | 190 g | 227 g | |
| Launch price | $499 | $420 |
Camera comparison
ASUS Zenfone 6 ZS630KL
- Main: 48MP f/1.8
- Ultrawide: 13MP
- Front: 48MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
ASUS Zenfone 6 ZS630KL
- 6.4" IPS LCD
- Resolution: 1080x2340
- Refresh rate: 60 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
ASUS Zenfone 6 ZS630KL
- 5000 mAh
- Wired: 18W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared ASUS Zenfone 6 ZS630KL and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads ASUS Zenfone 6 ZS630KL by 74.5% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $79. Redmi K90 Ultra was $79 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the ASUS Zenfone 6 ZS630KL (92/100 vs 54/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the ASUS Zenfone 6 ZS630KL (94/100 vs 43/100).
camera
In the "camera" category, the ASUS Zenfone 6 ZS630KL is a bit better (44/100 vs 37/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the ASUS Zenfone 6 ZS630KL (78/100 vs 43/100).
portability
In the "portability" category, the ASUS Zenfone 6 ZS630KL is a bit better (52/100 vs 40/100).
Frequently asked questions
Which is better: the ASUS Zenfone 6 ZS630KL or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the ASUS Zenfone 6 ZS630KL by 26 points (73/100 vs 47/100).
What is the rating of the ASUS Zenfone 6 ZS630KL and the Redmi K90 Ultra?
The ASUS Zenfone 6 ZS630KL has a MobileRank rating of 47/100, the Redmi K90 Ultra — 73/100.
Which has the better camera: the ASUS Zenfone 6 ZS630KL or the Redmi K90 Ultra?
The ASUS Zenfone 6 ZS630KL leads on camera score (44/100 vs 37/100).
Which is more powerful: the ASUS Zenfone 6 ZS630KL or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 54/100).
Should you choose the ASUS Zenfone 6 ZS630KL over the Redmi K90 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.