Lenovo Gen 12 ThinkPad X1 21KC0046US 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 7.3 weighted points vs 4.5, winning on CPU Benchmark, Refresh Rate, Thickness. The Lenovo Gen 12 ThinkPad X1 21KC0046US counters in a higher tier — worth it if its strengths match your needs.

Lenovo Gen 12 ThinkPad X1 21KC0046US

Intel Core Ultra 7 155U · Integrated (Intel iGPU)

Under $1900
4.9 (13)
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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

CategoryGen 12 ThinkPad X1 21KC0046USZenbook DUO UX8406CA-PS99T
Gaming3/104/10
Productivity5.8/105.9/10
Programming5.5/105.4/10
Engineering / 3D4.1/104.8/10
Student6/105.7/10
Travel / Portability7.2/106.7/10
AI Workloads4/104.7/10
Value for Money4.6/105.4/10

Detailed Specification Comparison

SpecGen 12 ThinkPad X1 21KC0046USZenbook DUO UX8406CA-PS99T
CPUIntel Core Ultra 7 155UIntel Core Ultra 9 285H
PassMark Score16,35533,772
CPU Cores2P+10E6P+10E
GPUIntegrated (Intel iGPU)Integrated (Intel iGPU)
G3DMark Score——
RAM32 GB DDR532 GB DDR5
RAM UpgradeableNo (soldered)No (soldered)
Storage1 TBSSD1 TBSSD
Display14″ IPSDual 14″ IPS
Resolution1920x12002880x1800
Refresh Rate60 Hz120 Hz
Pixel Density162 PPI— PPI
TouchscreenYesYes
Weight2.4 lbs3.64 lbs
Thickness0.59″0.57″
Amazon Rating4.9 ★ (13)4.4 ★ (108)
Value Score4.6/105.4/10

CPU Comparison

The Lenovo Zenbook DUO UX8406CA-PS99T's Intel Core Ultra 9 285H is ~106% faster in multi-threaded PassMark (33,772 vs 16,355). 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: 5.8/10 vs 5.9/10. Battery isn't in our dataset, but both share a similar power class, so expect comparable endurance.

Display

Gen 12 ThinkPad X1 21KC0046US: 14″ IPS 1920x1200 @ 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

Gen 12 ThinkPad X1 21KC0046US: 32 GB DDR5 (soldered) + 1 TBSSD. Zenbook DUO UX8406CA-PS99T: 32 GB DDR5 (soldered) + 1 TBSSD.

Build & Portability

2.4 lbs / 0.59″ vs 3.64 lbs / 0.57″. The Lenovo Gen 12 ThinkPad X1 21KC0046US is 1.2 lbs lighter — significant for daily carry. Travel scores: 7.2 vs 6.7.

Value

Value scores land 4.6/10 vs 5.4/10. The Lenovo Zenbook DUO UX8406CA-PS99T extracts more performance per dollar.

Final Verdict

Buy the Lenovo Zenbook DUO UX8406CA-PS99T — it wins the weighted spec battle. Choose the Lenovo Gen 12 ThinkPad X1 21KC0046US only if portability matter more to you.

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Also Consider

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