Which is better for heavy multitasking?

The IdeaPad Slim 3X. Its 16GB or 24GB of RAM beats the Dell's single 8GB stick, and reviewers say it stays smooth with many tabs and apps open.

Which has better battery life?

The IdeaPad Slim 3X. The Snapdragon X1 is an efficiency-focused Arm chip, while the Dell's Intel Core 3 100U and 120Hz panel draw more power.

Will all my Windows programs run on the Lenovo?

Most do, but the Snapdragon X1 is Arm-based, so some older apps and games need emulation or will not run. The Dell's Intel chip runs standard x86 software natively.

Is the Lenovo worth the extra $100?

Yes if you multitask a lot or need long battery life. If you mainly browse and write documents on a budget, the Dell at $429.98 covers it.

Which screen is better?

The Dell has a smoother 120Hz refresh rate. The Lenovo has a taller 1920x1200 panel that shows more of a document or web page. The Dell's 250 nits is dim.

Can I upgrade the Dell's RAM?

It ships with one 8GB DDR4 2666MHz module, so adding a second stick is the practical path to more memory. The Lenovo already ships with 16GB or 24GB.

DELL 15 LAPTOP C3-100U/8/512GB vs IdeaPad Slim 3X

Buy the Lenovo IdeaPad Slim 3X if you multitask heavily, want 16GB or 24GB of RAM, and value battery life and a sharper 1920x1200 screen. Buy the Dell 15 if you want the lowest price, need full x86 Windows compatibility for older software, or want a 120Hz display. The Lenovo costs about $100 more: $529.95 at eBay versus $429.98 at eBay, both as of November 4, 2026.

Today the DELL 15 LAPTOP C3-100U/8/512GB costs $190.02 less at its best price.

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