Lenovo IdeaPad Flex 5i vs Lenovo Zenbook DUO UX8406CA-PS99T

Benchmark-weighted head-to-head · data updated 2026-09-10

Winner: Lenovo Zenbook DUO UX8406CA-PS99T

Lenovo Zenbook DUO UX8406CA-PS99T takes 9.8 weighted points vs 5.5, winning on CPU Benchmark, RAM, Storage. The Lenovo IdeaPad Flex 5i counters in a higher tier — worth it if its strengths match your needs.

Lenovo IdeaPad Flex 5i

Intel Core i3-1215U · Integrated (Intel iGPU)

Under $600
4.2 (73)
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VS
Winner

Lenovo Zenbook DUO UX8406CA-PS99T

Intel Core Ultra 9 285H · Integrated (Intel iGPU)

Under $2500
4.4 (108)
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Use-Case Scores

CategoryIdeaPad Flex 5iZenbook DUO UX8406CA-PS99T
Gaming2.1/104/10
Productivity4.1/105.9/10
Programming3.1/105.4/10
Engineering / 3D2.6/104.8/10
Student5.2/105.7/10
Travel / Portability5.6/106.7/10
AI Workloads2.3/104.7/10
Value for Money5.8/105.4/10

Detailed Specification Comparison

SpecIdeaPad Flex 5iZenbook DUO UX8406CA-PS99T
CPUIntel Core i3-1215UIntel Core Ultra 9 285H
PassMark Score10,77433,772
CPU Cores2P+4E6P+10E
GPUIntegrated (Intel iGPU)Integrated (Intel iGPU)
G3DMark Score——
RAM8 GB DDR432 GB DDR5
RAM UpgradeableNo (soldered)No (soldered)
Storage256 GBSSD1 TBSSD
Display14″ IPSDual 14″ IPS
Resolution1920x10802880x1800
Refresh Rate60 Hz120 Hz
Pixel Density157 PPI— PPI
TouchscreenYesYes
Weight3.52 lbs3.64 lbs
Thickness0.68″0.57″
Amazon Rating4.2 ★ (73)4.4 ★ (108)
Value Score5.8/105.4/10

CPU Comparison

The Lenovo Zenbook DUO UX8406CA-PS99T's Intel Core Ultra 9 285H is ~213% faster in multi-threaded PassMark (33,772 vs 10,774). A generational gap you will feel in exports, compiles and heavy multitasking.

GPU & Gaming

Neither carries a dedicated GPU — both fine for esports at low settings, neither for modern AAA gaming.

Productivity & Battery

Office scores: 4.1/10 vs 5.9/10. Battery isn't in our dataset, but both share a similar power class, so expect comparable endurance.

Display

IdeaPad Flex 5i: 14″ IPS 1920x1080 @ 60 Hz. Zenbook DUO UX8406CA-PS99T: Dual 14″ IPS 2880x1800 @ 120 Hz. The Lenovo Zenbook DUO UX8406CA-PS99T's higher refresh rate wins for motion clarity.

RAM, Storage & Upgradeability

IdeaPad Flex 5i: 8 GB DDR4 (soldered) + 256 GBSSD. Zenbook DUO UX8406CA-PS99T: 32 GB DDR5 (soldered) + 1 TBSSD.

Build & Portability

3.52 lbs / 0.68″ vs 3.64 lbs / 0.57″. Effectively identical to carry. Travel scores: 5.6 vs 6.7.

Value

Value scores land 5.8/10 vs 5.4/10. The Lenovo IdeaPad Flex 5i extracts more performance per dollar.

Final Verdict

Buy the Lenovo Zenbook DUO UX8406CA-PS99T — it wins the weighted spec battle. Choose the Lenovo IdeaPad Flex 5i only if budget matter more to you.

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Also Consider

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