Lenovo ThinkPad X1 Carbon Gen 13 Aura

Lenovo describes it as memory on package, soldered to the system board, no slots, and explicitly not upgradable. That is not a cost cut. LPDDR5X-8533 at this speed in a sub-kilogram chassis is only possible because it is soldered.

It does mean the capacity decision is the most important one you make at purchase. Lunar Lake configurations top out at 32GB. If you need 64GB, you need an Arrow Lake configuration of this same chassis instead, which is a different SKU rather than a later upgrade.

A single M.2 2280 slot running PCIe 5.0 x4 on the V-series and H-series processors, or PCIe 4.0 x4 on the U-series. The 1TB configuration occupies it.

So the only upgrade this machine accepts is replacing the drive, not adding one. Clone before you swap, because there is nowhere to mount both at once.

Lenovo publishes 500 nits for this panel without stating whether that is a typical full screen figure or a peak, so the brightness condition is recorded as vendor unstated. Sustained CPU power is not published and has not been measured here.