Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Lenovo - Yoga 9i Gen 9 | ASUS - Zenbook S 14 UX5406 |
|---|---|---|
| CPU cores | 16 | 8 |
| RAM | 16 GB | 32 GB |
| Claimed battery life | 15 h | 16 h |
| Battery | 75 Wh | 72 Wh |
| Weight | 1.36 kg | 1.20 kg |
Between the Yoga 9i Gen 9 and Zenbook S 14 UX5406, the Yoga 9i Gen 9 comes out ahead in cpu cores / battery, while the Zenbook S 14 UX5406 wins on ram / claimed battery life. Overall, the Yoga 9i Gen 9 scores 69.5 and the Zenbook S 14 UX5406 scores 69.1 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (69.5 vs 69.1). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Yoga 9i Gen 9 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are cpu cores, battery. The single most decisive one: CPU cores — 100.00% more. 16 vs 8.
Pick the Zenbook S 14 UX5406 if you care most about ram / claimed battery life. Its strongest claims are ram, claimed battery life, weight. The single most decisive one: RAM — 100.00% more. 32 GB vs 16 GB.
Both ship with comparable storage, screen size, refresh rate, 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: Lenovo - Yoga 9i Gen 9 or ASUS - Zenbook S 14 UX5406?
Lenovo - Yoga 9i Gen 9 leads the current Mars Score by 0.4 points.The more useful decision is the trade-off behind that result: compare ram, weight, battery against the way you will actually use the product.
Choose Lenovo - Yoga 9i Gen 9 if…
Lenovo - Yoga 9i Gen 9 has the measurable edge on cpu cores, battery wh.
Choose ASUS - Zenbook S 14 UX5406 if…
ASUS - Zenbook S 14 UX5406 has the measurable edge on ram gb, claimed battery h, weight kg.
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 Lenovo - Yoga 9i Gen 9 wins
- ▲CPU cores — 100.00% more. 16 vs 8.
- ▲Battery — 4.17% more. 75 Wh vs 72 Wh.
Why ASUS - Zenbook S 14 UX5406 wins
- ▲RAM — 100.00% more. 32 GB vs 16 GB.
- ▲Claimed battery life — 6.67% more. 16 h vs 15 h.
- ▲Weight — 0.16 kg less. 1.20 vs 1.36.
Spec comparison
Design
| Spec | Lenovo - Yoga 9i Gen 9 | ASUS - Zenbook S 14 UX5406 |
|---|---|---|
| Weight | 1.36 kg | 1.20 kglead |
| Thickness | 16 mm | 11.9 mmlead |
| Build material | aluminum | ceraluminum |
| Backlit keyboard | true | true |
| Fingerprint reader | true | true |
Display
| Spec | Lenovo - Yoga 9i Gen 9 | ASUS - Zenbook S 14 UX5406 |
|---|---|---|
| Screen size | 14 " | 14 " |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Panel typeⓘ | OLED | OLED |
Performance
| Spec | Lenovo - Yoga 9i Gen 9 | ASUS - Zenbook S 14 UX5406 |
|---|---|---|
| CPU | Intel Core Ultra 7 155H | Intel Core Ultra 7 258V |
| CPU cores | 16lead | 8 |
| GPUⓘ | Intel Arc Graphics | Intel Arc 140V |
| RAMⓘ | 16 GB | 32 GBlead |
| Storageⓘ | 1024 GB | 1024 GB |
| Storage typeⓘ | SSD | SSD |
Battery & Ports
| Spec | Lenovo - Yoga 9i Gen 9 | ASUS - Zenbook S 14 UX5406 |
|---|---|---|
| Batteryⓘ | 75 Whlead | 72 Wh |
| Claimed battery life | 15 h | 16 hlead |
| USB-C portsⓘ | 2 | 2 |
| Thunderbolt portsⓘ | 2 | 2 |
| HDMI | false | truelead |
Frequently asked
Which has better battery life, Yoga 9i Gen 9 or Zenbook S 14 UX5406?+
Zenbook S 14 UX5406 claims up to 16 hours — 15h vs 16h.
Which is lighter, Yoga 9i Gen 9 or Zenbook S 14 UX5406?+
Zenbook S 14 UX5406 is lighter at 1.20 kg vs 1.36 kg.
Which has more RAM, Yoga 9i Gen 9 or Zenbook S 14 UX5406?+
Zenbook S 14 UX5406 offers 32GB of RAM.
Which has an OLED display, Yoga 9i Gen 9 or Zenbook S 14 UX5406?+
Both have OLED displays.