Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Oppo - Find X8 | Xiaomi 15 Ultra |
|---|---|---|
| Wireless charging | 50 W | 80 W |
| Weight | 193 g | 229 g |
| RAM | 12 GB | 16 GB |
| Pixel density | 460 ppi | 522 ppi |
| Wired charging | 80 W | 90 W |
| Battery capacity | 5630 mAh | 6000 mAh |
Between the Find X8 and Xiaomi 15 Ultra, the Find X8 comes out ahead in weight / promised os updates, while the Xiaomi 15 Ultra wins on wireless charging / ram. Overall, the Find X8 scores 70.9 and the Xiaomi 15 Ultra scores 71.5 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (70.9 vs 71.5). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Find X8 if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight, promised os updates. The single most decisive one: Weight — 36.00 g less. 193 vs 229.
Pick the Xiaomi 15 Ultra if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are wireless charging, ram, pixel density, among others. The single most decisive one: Wireless charging — 60.00% more. 80 W vs 50 W.
Both ship with comparable main camera, refresh rate, 5g support, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Oppo - Find X8 or Xiaomi 15 Ultra?
Xiaomi 15 Ultra leads the current Mars Score by 0.6 points.The more useful decision is the trade-off behind that result: compare screen size, ram, pixel density, battery capacity against the way you will actually use the product.
Choose Oppo - Find X8 if…
Oppo - Find X8 has the measurable edge on weight g, promised os years.
Choose Xiaomi 15 Ultra if…
Xiaomi 15 Ultra has the measurable edge on wireless charging w, ram gb, pixel density ppi.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Oppo - Find X8 wins
- ▲Weight — 36.00 g less. 193 vs 229.
- ▲Promised OS updates: 5 (vs 4).
Why Xiaomi 15 Ultra wins
- ▲Wireless charging — 60.00% more. 80 W vs 50 W.
- ▲RAM — 33.33% more. 16 GB vs 12 GB.
- ▲Pixel density — 13.48% more. 522 ppi vs 460 ppi.
- ▲Wired charging — 12.50% more. 90 W vs 80 W.
- ▲Battery capacity — 6.57% more. 6000 mAh vs 5630 mAh.
- ▲AnTuTu — 5.43% more. 2720000 vs 2580000.
- ▲Screen size — 2.12% more. 6.73 " vs 6.59 ".
Spec comparison
Design
| Spec | Oppo - Find X8 | Xiaomi 15 Ultra |
|---|---|---|
| Weight | 193 glead | 229 g |
| Thickness | 7.85 mmlead | 9.4 mm |
| Water resistanceⓘ | IP68 | IP68 |
| Form factor | bar | bar |
Display
| Spec | Oppo - Find X8 | Xiaomi 15 Ultra |
|---|---|---|
| Screen size | 6.59 " | 6.73 "lead |
| Pixel densityⓘ | 460 ppi | 522 ppilead |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 4500 nitslead | 3200 nits |
Performance
| Spec | Oppo - Find X8 | Xiaomi 15 Ultra |
|---|---|---|
| RAMⓘ | 12 GB | 16 GBlead |
| Storageⓘ | 256 GB | 512 GBlead |
| AnTuTuⓘ | 2580000 | 2720000lead |
| CPU total clockⓘ | 22.4 GHz | 22.8 GHzlead |
Cameras
| Spec | Oppo - Find X8 | Xiaomi 15 Ultra |
|---|---|---|
| Main cameraⓘ | 50 MP | 50 MP |
| Front camera | 32 MP | 32 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Oppo - Find X8 | Xiaomi 15 Ultra |
|---|---|---|
| Battery capacityⓘ | 5630 mAh | 6000 mAhlead |
| Wired chargingⓘ | 80 W | 90 Wlead |
| Wireless chargingⓘ | 50 W | 80 Wlead |
Connectivity
| Spec | Oppo - Find X8 | Xiaomi 15 Ultra |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Oppo - Find X8 | Xiaomi 15 Ultra |
|---|---|---|
| OS | Android | Android |
| Promised OS updates | 5 yearslead | 4 years |
Frequently asked
Which has better battery, Find X8 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has 6.6% more battery — 5630 mAh vs 6000 mAh.
Which is lighter, Find X8 or Xiaomi 15 Ultra?+
Find X8 is 36g lighter — 193g vs 229g.
Is Find X8 waterproof?+
Find X8 has an IP68 rating.
Does Xiaomi 15 Ultra support 5G?+
Yes, Xiaomi 15 Ultra supports 5G.
Which has more RAM, Find X8 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra offers 16GB of RAM.
Which has a better camera, Find X8 or Xiaomi 15 Ultra?+
Xiaomi 15 Ultra has a 50 MP main camera vs 50 MP.