ASUS Zenfone 8 vs Redmi K90 Ultra
The ASUS Zenfone 8 (2021) runs on the Qualcomm Snapdragon 888, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $599 and $420. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 55/100 (a 18-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 4000); the main camera is 64 MP vs 50 MP; the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 1,119,714); the ASUS Zenfone 8 is noticeably lighter (169g vs 227g).
ASUS Zenfone 8
Redmi K90 Ultra
- Better main camera: 64MP vs 50MP
- Lighter: 169g vs 227g
- Better camera (43/100 vs 37/100)
- Better portability (68/100 vs 40/100)
- Higher AnTuTu: 3233695 vs 1119714
- Better Geekbench Single: 3041 vs 1488
- Better Geekbench Multi: 9494 vs 3373
- Bigger battery: 8550 vs 4000 mAh
- Faster charging: 100W vs 30W
- Higher refresh rate: 165Hz vs 120Hz
- Cheaper at launch: $420 vs $599
- Higher performance (92/100 vs 63/100)
- Longer battery life (78/100 vs 29/100)
- Better display (94/100 vs 84/100)
Comparing the ASUS Zenfone 8 vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 18 points higher (73/100 vs 55/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 63/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 29/100). Value score: ASUS Zenfone 8 — 22/100, Redmi K90 Ultra — 82/100; it is biased by price level, so it should not be compared directly between devices at different prices. In the "performance" category, the Redmi K90 Ultra notably outperforms the ASUS Zenfone 8 (92/100 vs 63/100). In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 84/100). In the "camera" category, the ASUS Zenfone 8 is a bit better (43/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the ASUS Zenfone 8 (78/100 vs 29/100). In the "portability" category, the ASUS Zenfone 8 notably outperforms the Redmi K90 Ultra (68/100 vs 40/100).
| Specification | ASUS Zenfone 8 | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 888 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 1119714 | 3233695 | |
| Geekbench Single | 1488 | 3041 | |
| Geekbench Multi | 3373 | 9494 | |
| Display | 5.9" Super AMOLED | 6.8" AMOLED | |
| Resolution | 2400x1080 | 1280x2772 | |
| Refresh rate | 120 Hz | 165 Hz | |
| Battery | 4000 mAh | 8550 mAh | |
| Charging | 30W | 100W | |
| Main camera | 64 MP | 50 MP | |
| Ultrawide | 12 MP | 8 MP | |
| Front camera | 12 MP | 20 MP | |
| RAM | 6GB / 8GB / 12GB / 16GB | 12GB / 16GB | |
| Storage | 128GB / 256GB | 256GB / 512GB | |
| OS | Android 11 / ZenUI | Android 16 | |
| Brightness (peak) | 1100 nits | 3500 nits | |
| NFC | yes | yes | |
| Protection | IP68 | IP68/IP69 | |
| Dimensions | 148.0×68.5×8.9 mm | 162.9×77.9×8.2 mm | |
| Weight | 169 g | 227 g | |
| Launch price | $599 | $420 |
ASUS Zenfone 8
- Main: 64MP f/f/1.8
- Ultrawide: 12MP
- Front: 12MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
ASUS Zenfone 8
- 5.9" Super AMOLED
- Resolution: 2400x1080
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
ASUS Zenfone 8
- 4000 mAh
- Wired: 30W
- Wireless charging: no data
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
We compared ASUS Zenfone 8 and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads ASUS Zenfone 8 by 65.4% in our overall performance rating.
Launch price difference: $179. Redmi K90 Ultra was $179 cheaper at launch.
performance
In the "performance" category, the Redmi K90 Ultra notably outperforms the ASUS Zenfone 8 (92/100 vs 63/100).
display
In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 84/100).
camera
In the "camera" category, the ASUS Zenfone 8 is a bit better (43/100 vs 37/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the ASUS Zenfone 8 (78/100 vs 29/100).
portability
In the "portability" category, the ASUS Zenfone 8 notably outperforms the Redmi K90 Ultra (68/100 vs 40/100).
Which is better: the ASUS Zenfone 8 or the Redmi K90 Ultra?
The Redmi K90 Ultra is noticeably better than the ASUS Zenfone 8 — the overall rating gap is 18 points.
What is the rating of the ASUS Zenfone 8 and the Redmi K90 Ultra?
The ASUS Zenfone 8 has a MobileRank rating of 55/100, the Redmi K90 Ultra — 73/100.
Which has the better camera: the ASUS Zenfone 8 or the Redmi K90 Ultra?
The ASUS Zenfone 8 leads on camera score (43/100 vs 37/100).
Which is more powerful: the ASUS Zenfone 8 or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 63/100).
Should you choose the ASUS Zenfone 8 over the Redmi K90 Ultra?
The ASUS Zenfone 8 is a better fit for active users. The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.