Poco X8 vs Redmi K90 Ultra
The Poco X8 (2026) runs on the Qualcomm Snapdragon 6s Gen 4, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $389 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 8340); the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 829,894).
Profile comparison
Category scores
Poco X8
Redmi K90 Ultra
What makes Poco X8 better?
- Lighter: 223g vs 227g
- Cheaper at launch: $389 vs $420
- Overall rating 55/100
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 829894
- Better Geekbench Single: 3013 vs 1009
- Better Geekbench Multi: 9287 vs 2892
- Bigger battery: 8550 vs 8340 mAh
- Faster charging: 100W vs 67W
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (92/100 vs 55/100)
- Better camera (37/100 vs 35/100)
- Longer battery life (78/100 vs 69/100)
- Better display (94/100 vs 84/100)
- Better portability (40/100 vs 39/100)
Comparison verdict
Comparing the Poco X8 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 55/100). Value score: Poco X8 — 40/100, 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 Poco X8 (92/100 vs 55/100). In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 84/100). In the "camera" category, the Redmi K90 Ultra and the Poco X8 are nearly equal (37/100 vs 35/100). In the "battery" category, the Redmi K90 Ultra is a bit better (78/100 vs 69/100). In the "portability" category, the Redmi K90 Ultra and the Poco X8 are nearly equal (40/100 vs 39/100).
Specs comparison
| Specification | Poco X8 | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 6s Gen 4 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 829894 | 3233695 | |
| Geekbench Single | 1009 | 3013 | |
| Geekbench Multi | 2892 | 9287 | |
| Display | 6.8" AMOLED | 6.8" AMOLED | |
| Resolution | 1280x2772 | 1280x2772 | |
| Refresh rate | 120 Hz | 165 Hz | |
| Battery | 8340 mAh | 8550 mAh | |
| Charging | 67W | 100W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 8 MP | 8 MP | |
| Front camera | 16 MP | 20 MP | |
| RAM | 6GB / 8GB / 12GB | 12GB / 16GB | |
| Storage | 128GB / 256GB | 256GB / 512GB | |
| OS | Android 16 | Android 16 | |
| Brightness (peak) | 3500 nits | 3500 nits | |
| NFC | yes | yes | |
| Protection | IP68/IP69K | IP68/IP69 | |
| Dimensions | 163.5×78.3×8.6 mm | 162.9×77.9×8.2 mm | |
| Weight | 223 g | 227 g | |
| Launch price | $389 | $420 |
Camera comparison
Poco X8
- Main: 50MP f/1.8
- Ultrawide: 8MP
- Front: 16MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
Poco X8
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
Poco X8
- 8340 mAh
- Wired: 67W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared Poco X8 and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Poco X8 by 74.3% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $31. Poco X8 was $31 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Poco X8 (92/100 vs 55/100).
display
In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 84/100).
camera
In the "camera" category, the Redmi K90 Ultra and the Poco X8 are nearly equal (37/100 vs 35/100).
battery
In the "battery" category, the Redmi K90 Ultra is a bit better (78/100 vs 69/100).
portability
In the "portability" category, the Redmi K90 Ultra and the Poco X8 are nearly equal (40/100 vs 39/100).
Frequently asked questions
Which is better: the Poco X8 or the Redmi K90 Ultra?
The Redmi K90 Ultra is noticeably better than the Poco X8 — the overall rating gap is 18 points.
What is the rating of the Poco X8 and the Redmi K90 Ultra?
The Poco X8 has a MobileRank rating of 55/100, the Redmi K90 Ultra — 73/100.
Which is more powerful: the Poco X8 or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 55/100).
Should you choose the Poco X8 over the Redmi K90 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.