ASUS ROG Phone II ZS660KL vs Redmi K90 Ultra
The ASUS ROG Phone II ZS660KL (2019) runs on the Qualcomm Snapdragon 855+, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $899 and $420. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 52/100 (a 21-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 6000); the main camera is 48 MP vs 50 MP; the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 859,084); the Redmi K90 Ultra is thinner (8.2mm vs 9.5mm).
Profile comparison
Category scores
ASUS ROG Phone II ZS660KL
Redmi K90 Ultra
What makes ASUS ROG Phone II ZS660KL better?
- Better camera (39/100 vs 37/100)
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 859084
- Better Geekbench Single: 3013 vs 1031
- Better Geekbench Multi: 9287 vs 2864
- Bigger battery: 8550 vs 6000 mAh
- Faster charging: 100W vs 30W
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 165Hz vs 120Hz
- Lighter: 227g vs 240g
- Cheaper at launch: $420 vs $899
- Higher performance (92/100 vs 55/100)
- Longer battery life (78/100 vs 53/100)
- Better display (94/100 vs 79/100)
- Better portability (40/100 vs 20/100)
Comparison verdict
Comparing the ASUS ROG Phone II ZS660KL vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 21 points higher (73/100 vs 52/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 55/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 53/100). Value score: ASUS ROG Phone II ZS660KL — 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 ROG Phone II ZS660KL (92/100 vs 55/100). In the "display" category, the Redmi K90 Ultra notably outperforms the ASUS ROG Phone II ZS660KL (94/100 vs 79/100). In the "camera" category, the ASUS ROG Phone II ZS660KL and the Redmi K90 Ultra are nearly equal (39/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra notably outperforms the ASUS ROG Phone II ZS660KL (78/100 vs 53/100). In the "portability" category, the Redmi K90 Ultra notably outperforms the ASUS ROG Phone II ZS660KL (40/100 vs 20/100).
Specs comparison
| Specification | ASUS ROG Phone II ZS660KL | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 855+ | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 859084 | 3233695 | |
| Geekbench Single | 1031 | 3013 | |
| Geekbench Multi | 2864 | 9287 | |
| Display | 6.6" AMOLED | 6.8" AMOLED | |
| Resolution | 1080x2340 | 1280x2772 | |
| Refresh rate | 120 Hz | 165 Hz | |
| Battery | 6000 mAh | 8550 mAh | |
| Charging | 30W | 100W | |
| Main camera | 48 MP | 50 MP | |
| Ultrawide | 13 MP | 8 MP | |
| Front camera | 24 MP | 20 MP | |
| RAM | 8GB / 12GB | 12GB / 16GB | |
| Storage | 128GB / 256GB / 512GB / 1TB | 256GB / 512GB | |
| OS | Android 9.0 / ROG UI | Android 16 | |
| Brightness (peak) | — | 3500 nits | |
| NFC | yes | yes | |
| Protection | — | IP68/IP69 | |
| Dimensions | 171.0×77.6×9.5 mm | 162.9×77.9×8.2 mm | |
| Weight | 240 g | 227 g | |
| Launch price | $899 | $420 |
Camera comparison
ASUS ROG Phone II ZS660KL
- Main: 48MP f/1.8
- Ultrawide: 13MP
- Front: 24MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
ASUS ROG Phone II ZS660KL
- 6.6" AMOLED
- Resolution: 1080x2340
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
ASUS ROG Phone II ZS660KL
- 6000 mAh
- Wired: 30W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared ASUS ROG Phone II ZS660KL and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads ASUS ROG Phone II ZS660KL by 73.4% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $479. Redmi K90 Ultra was $479 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the ASUS ROG Phone II ZS660KL (92/100 vs 55/100).
display
In the "display" category, the Redmi K90 Ultra notably outperforms the ASUS ROG Phone II ZS660KL (94/100 vs 79/100).
camera
In the "camera" category, the ASUS ROG Phone II ZS660KL and the Redmi K90 Ultra are nearly equal (39/100 vs 37/100).
battery
In the "battery" category, the Redmi K90 Ultra notably outperforms the ASUS ROG Phone II ZS660KL (78/100 vs 53/100).
portability
In the "portability" category, the Redmi K90 Ultra notably outperforms the ASUS ROG Phone II ZS660KL (40/100 vs 20/100).
Frequently asked questions
Which is better: the ASUS ROG Phone II ZS660KL or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the ASUS ROG Phone II ZS660KL by 21 points (73/100 vs 52/100).
What is the rating of the ASUS ROG Phone II ZS660KL and the Redmi K90 Ultra?
The ASUS ROG Phone II ZS660KL has a MobileRank rating of 52/100, the Redmi K90 Ultra — 73/100.
Which is more powerful: the ASUS ROG Phone II ZS660KL or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 55/100).
Should you choose the ASUS ROG Phone II ZS660KL over the Redmi K90 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.