Lenovo ThinkPad X1 Carbon Gen 12 U7-155U/32GB/1TB SSD
PRODUCT DESCRIPTION
Lenovo ThinkPad X1 Carbon Gen 12, Intel Core Ultra 7 155U, 32GB soldered LPDDR5X, 1TB SSD M.2 2280 (21KDS0NK00-SC) — 3 Years Onsite, Singapore Local Warranty
Stock status. This exact part number is currently at zero inventory. It is still active while stock lasts, and we can offer a closely matching current-generation configuration on request.
About the ThinkPad X1 Carbon Gen 12
The ThinkPad X1 Carbon Gen 12 is a Lenovo ThinkPad built to the range's usual Singapore-market brief: MIL-STD-810H tested, discrete TPM 2.0 hardware security, and Lenovo's ThinkPad keyboard and TrackPoint layout. This exact part number is a specific factory build; the full option matrix Lenovo publishes for the machine type is in the Chassis and Platform section below.
Where this configuration sits in the range
The ThinkPad X1 Carbon Gen 12 runs on the ThinkPad X1 Carbon Gen 12, Intel Core Ultra Series 1 (Meteor Lake) platform. Lenovo classifies this machine type as an AI PC. Memory is soldered to the board with no slots, so it cannot be changed after purchase. One M.2 2280 slot, PCIe 4.0 x4, Opal 2.0; up to 2TB. It has no onboard Ethernet; wired networking uses a USB-C adapter or a dock.
Who this configuration suits
Fleet buyers who need this specific historically-stocked configuration for parts continuity, image compatibility or a like-for-like replacement. For fresh purchases we usually recommend the current generation of the same chassis line — ask us and we will quote both.
Specification note. This page lists the configuration named in the store title and the distributor build sheet, and separately shows Lenovo's published chassis facts for machine type 21KD. Where the two sources differ, both figures are shown and attributed; anything neither source states is marked not stated rather than estimated. Specifications and prices are subject to change by Lenovo without notice.
Product Video
ThinkPad X1 Carbon Gen 12 21KDS0NK00-SC — Full Specifications
This Configuration
The fields below come from the distributor build sheet for this exact part number. Lenovo's published chassis facts for the whole machine type follow underneath.
| Part number | 21KDS0NK00-SC |
| Machine type | 21KD |
| Model | ThinkPad X1 Carbon Gen 12 |
| Processor | Intel Core Ultra 7 155U (E-cores up to 3.8GHz, P-cores up to 4.8GHz) |
| Graphics | Integrated Intel Graphics |
| Memory | 32GB soldered LPDDR5X (build sheet: 7500 MT/s; Lenovo PSREF publishes 6400 MT/s for this machine type) |
| Storage | 1TB SSD M.2 2280 PCIe 4.0 x4 TLC Opal |
| Display | 14in WUXGA (1920x1200) IPS antiglare, 400 nits, 60Hz, low power (non-touch) |
| Camera | 1080p FHD RGB + IR with two microphones |
| Battery | 3-cell 57Wh, Rapid Charge |
| AC adapter | 65W USB-C (build sheet specifies a UK 3-pin plug); USB-C to RJ45 adapter included |
| Wireless | Intel Wi-Fi 6E AX211 (vPro) + Bluetooth 5.3 |
| Material | Carbon fibre with black paint |
| Keyboard | Backlit, with fingerprint reader, English (US) |
| Operating system | Windows 11 Pro |
Chassis and Platform — Lenovo published specifications for machine type 21KD
| Machine type | 21KC / 21KD |
| Chassis | ThinkPad X1 Carbon Gen 12, Intel Core Ultra Series 1 (Meteor Lake) platform |
| Processor family | Intel Core Ultra 5 125H/125U/135U, Ultra 7 155H/155U/165H/165U |
| Graphics options | Integrated Intel Graphics |
| AI PC category | AI PC |
| NPU | Intel AI Boost, up to 11 TOPS (12 TOPS on the 165U) |
| Memory topology | LPDDR5X-6400, soldered to the system board, no memory slots |
| Memory ceiling | up to 64GB; not upgradable after purchase |
| Storage | One M.2 2280 slot, PCIe 4.0 x4, Opal 2.0; up to 2TB |
| Display panels published | 14in WUXGA IPS 400 nits (non-touch or touch); 14in WUXGA 500 nits ThinkPad Privacy Guard; 14in 2.8K (2880x1800) OLED 400 nits (non-touch or touch) |
| Wireless options | Intel Wi-Fi 6E AX211 or Wi-Fi 7 BE200; Bluetooth 5.3 |
| WWAN options | Optional Nano-SIM |
| Battery | Integrated 57Wh (single option) |
| AC adapter | 45W or 65W USB-C |
| Audio | Stereo speakers Dolby Atmos; dual-microphone array with Dolby Voice |
| Security | Discrete TPM 2.0, FIPS 140-2; Kensington Nano Security Slot 2.5x6 mm |
| Chassis dimensions | 312.8 x 214.75 x 14.96 mm; starting at 1.08 kg; MIL-STD-810H tested |
| Lifecycle | Current |
Sources: Lenovo PSREF (book dated 6 May 2026).
Worth knowing about this configuration
Memory speed: the build sheet states LPDDR5X-7500; Lenovo PSREF publishes LPDDR5X-6400 for this machine type. Both are shown.
Why This Page Shows Two Specification Groups
The This Configuration block lists what the store title and the distributor build sheet assert for this exact part number: processor, memory, storage and the per-unit options. The Chassis and Platform block underneath quotes what Lenovo publishes for the whole machine type — the panels, ports, wireless cards, adapters and warranty terms the chassis is capable of — without claiming any single row was fitted to this particular unit.
Reading them side by side is how the storefront tells a part-specific fact apart from a chassis-wide capability. Where the two sources disagree, both are shown and attributed. If you need us to confirm a specific option on this exact part number, ask and we will check with the distributor.
Warranty and Service Cover
Every SourceIT unit is supplied with Singapore local warranty.
The distributor build sheet for this configuration documents a 3-year onsite service level. Lenovo's own base term for this machine type is shorter — Lenovo publishes a 3-year onsite option qualified (1-yr battery): the system is covered for three years, the battery for one.
Base warranty terms Lenovo publishes for the ThinkPad X1 Carbon Gen 12:
- 1-year courier or carry-in service
- 1-year courier or carry-in with 2-year system board service (Korea only)
- 1-year limited onsite service
- 3-year (1-yr battery) courier or carry-in service
- 3-year (1-yr battery) limited onsite service
- No base warranty
PSREF does not enumerate Premier Support for this chassis; Premier Support and warranty upgrades come from separate Lenovo Services SKUs and are quoted on request. Register the serial number on Lenovo Support after purchase to activate Singapore-region cover.
Ports, Docking and Other Configurations We Stock
Ports on this chassis
- 2x USB-C Thunderbolt 4 / USB4 40Gbps
- 2x USB-A (one Always On)
- 1x HDMI 2.1, up to 4K/60Hz
- 3.5 mm headphone / microphone combo jack
- No onboard Ethernet RJ-45 (USB-C adapter or dock required)
- No SD or microSD reader
Docking is over the USB-C / Thunderbolt port. Lenovo ThinkPad USB-C and Thunderbolt docks work on this chassis.
Other configurations of this machine
This part number is at zero inventory. Ask us for a like-for-like quote on a closely matching current-generation configuration, or on another variant of the same machine type in the distributor channel.
Questions We Get Asked About This Machine
Is this an AI PC or a Copilot+ PC?
Lenovo classifies this machine type as an AI PC (Intel AI Boost, up to 11 TOPS (12 TOPS on the 165U)). It is not a Copilot+ PC — that classification needs a 40+ TOPS NPU, which this platform does not reach.
Can the memory be upgraded?
No. Memory is soldered to the system board with no slots, so the fitted capacity is fixed for the life of the machine. Choose the capacity you need at purchase.
Is the three-year cover real?
Yes — it is documented on the distributor build sheet for this configuration. See the Warranty and Service Cover section for exactly what Lenovo publishes as the base term versus the configured upgrade.
