Lenovo / ThinkPad / X1 Carbon

ThinkPad X1 Carbon Gen 12

ThinkPad X1 Carbon Gen 12 is a 14-inch notebook in the X1 Carbon family.

Scope: Product generation / platformPSREF verified
Machine Type: 21KC / 21KD
Model / MTM: 5341Official Models verifiedDirect specifications: 21KC000BJP

Compare generations: ThinkPad X1 Carbon Gen 8–13

Search Japan marketplaces for ThinkPad X1 Carbon Gen 12Amazon Japan Rakuten Ichiba (Japan)Yahoo! Shopping (Japan)Mercari (Japan)Yahoo! Auctions (Japan)External sitesPR

Buying and service essentials

Verified in official sources

Check before buying

Model / MTM: 1 exact specifications recorded5341 Models entries verified
CPU / GPU: Intel U or H Series Core Ultra 5 / 7 Processor Series 17 CPU options / Intel Graphics / Intel Arc Graphics / Platform options / integrated GPU varies by CPU / this PSREF does not list a dGPU option
Display: 14-inch / 1920x1200 / 2880x18005 platform options / Non-touch / Multi-touch
WWAN: Configuration-dependentRetrofit conditions apply

Upgrades and repair

Memory: LPDDR5X-6400 / SolderedSO-DIMM: 0 / maximum 64 GB
Storage: M.2 2280 SSDPCIe NVMe 4.0 x4 / PCIe NVMe 4.0 x4 Performance / Maximum simultaneous devices 1 device(s)
Power: USB-C Power Delivery 3.0AC adapter: 45 W / 65 W
Parts / service: Display Battery Keyboard / bezelHMM verified / Key procedures verified

Motherboard and slot topology

Shows the strength of the supporting evidence. It is not a performance score or recommendation. Full sources appear in the Evidence section below.

Memory implementation: LPDDR5X-6400 / Soldered / SO-DIMM: 0
Storage form factor: M.2 2280 SSD
Maximum simultaneous devices: 1 device(s)

Hardware Maintenance ManualOpen external site in a new tab

Specifications

CPU

CPU options for this platform / IntelIntel U or H Series Core Ultra 5 / 7 Processor Series 1

CPU	Integrated GPU	Cores / threads	Base frequency	Max frequency
Intel Core Ultra 5 125HOpen external site in a new tab	Intel Arc Graphics	14 / 18	1.20 GHz	4.50 GHz
Intel Core Ultra 5 125UOpen external site in a new tab	Intel Graphics	12 / 14	1.30 GHz	4.30 GHz
Intel Core Ultra 5 135UOpen external site in a new tab	Intel Graphics	12 / 14	1.60 GHz	4.40 GHz
Intel Core Ultra 7 155HOpen external site in a new tab	Intel Arc Graphics	16 / 22	1.40 GHz	4.80 GHz
Intel Core Ultra 7 155UOpen external site in a new tab	Intel Graphics	12 / 14	1.70 GHz	4.80 GHz
Intel Core Ultra 7 165HOpen external site in a new tab	Intel Arc Graphics	16 / 22	1.40 GHz	5.00 GHz
Intel Core Ultra 7 165UOpen external site in a new tab	Intel Graphics	12 / 14	1.70 GHz	4.90 GHz

NPU

NPU	Applicable CPU	NPU performance	Overall platform performance
IntelIntel AI Boost	Intel Core Ultra 5 125H / Intel Core Ultra 5 125U / Intel Core Ultra 5 135U / Intel Core Ultra 7 155H / Intel Core Ultra 7 155U / Intel Core Ultra 7 165H	Up to 11 TOPS	Not recorded
IntelIntel AI Boost	Intel Core Ultra 7 165U	Up to 12 TOPS	Not recorded

The PSREF processor table lists up to 12 TOPS for Intel Core Ultra 7 165U while the product-level NPU summary states up to 11 TOPS.

These are PSREF platform options, not the NPU installed in an individual Model / MTM. Overall platform performance is distinct from NPU-only performance.

Memory

Type: LPDDR5X-6400
Maximum capacity: 64 GB
Physical slots: 0
Implementation: LPDDR5X-6400 / Soldered
Upgrade / replacement: Not recorded
Capacity options: 16 GB / 32 GB / 64 GB
Configuration constraints: Memory is soldered to the system board, has no slots, and is not upgradable
Installed memory is LPDDR5X-7500 but runs as LPDDR5X-6400 due to platform limitation

Check the board layout in the HMMOpen external site in a new tab

Storage

Interface and form factor: PCIe NVMe 4.0 x4 / PCIe NVMe 4.0 x4 Performance
Supported form factors: M.2 2280 SSD
Physical slots: 1
Maximum simultaneous devices: 1 device(s)
Upgrade / replacement: Not recorded
Configuration constraints / exclusions: The PSREF explicitly documents one drive and one M.2 2280 PCIe 4.0 x4 slot.

Search Japan marketplaces for M.2 2280 NVMe SSDAmazon Japan Rakuten Ichiba (Japan)Yahoo! Shopping (Japan)Mercari (Japan)Yahoo! Auctions (Japan)External sitesPR

Check the SSD replacement procedure in the HMMOpen external site in a new tab

Display

Size: 14-inch
Platform configuration options: configuration Resolution Touch Panel / brightness Surface / features
WUXGA IPS low power
14-inch 1920x1200 Non-touch IPS / 400 nits anti-glare / Low power / Eyesafe Certified 2.0
WUXGA IPS touch low power
14-inch 1920x1200 Multi-touch IPS / 400 nits anti-glare / Low power / Eyesafe Certified 2.0 / On-cell touch / 10-point touch
WUXGA IPS Privacy Guard
14-inch 1920x1200 Non-touch IPS / 500 nits anti-glare / ThinkPad Privacy Guard / Eyesafe Certified 2.0
2.8K OLED
14-inch 2880x1800 Non-touch OLED / 400 nits anti-glare anti-reflection anti-smudge / DisplayHDR True Black 500 / Dolby Vision / Eyesafe Certified 2.0 / 120Hz
2.8K OLED touch
14-inch 2880x1800 Multi-touch OLED / 400 nits anti-glare anti-reflection anti-smudge / DisplayHDR True Black 500 / Dolby Vision / Eyesafe Certified 2.0 / Add-on Film Touch / 10-point touch / 120Hz

configuration	Resolution	Touch	Panel / brightness	Surface / features
WUXGA IPS low power 14-inch	1920x1200	Non-touch	IPS / 400 nits	anti-glare / Low power / Eyesafe Certified 2.0
WUXGA IPS touch low power 14-inch	1920x1200	Multi-touch	IPS / 400 nits	anti-glare / Low power / Eyesafe Certified 2.0 / On-cell touch / 10-point touch
WUXGA IPS Privacy Guard 14-inch	1920x1200	Non-touch	IPS / 500 nits	anti-glare / ThinkPad Privacy Guard / Eyesafe Certified 2.0
2.8K OLED 14-inch	2880x1800	Non-touch	OLED / 400 nits	anti-glare anti-reflection anti-smudge / DisplayHDR True Black 500 / Dolby Vision / Eyesafe Certified 2.0 / 120Hz
2.8K OLED touch 14-inch	2880x1800	Multi-touch	OLED / 400 nits	anti-glare anti-reflection anti-smudge / DisplayHDR True Black 500 / Dolby Vision / Eyesafe Certified 2.0 / Add-on Film Touch / 10-point touch / 120Hz

Listing scope	Configuration	P/N listed for this model	Lenovo FRU flag
Exact configuration 21KC000BJP	14" / WUXGA / Non-Touch / IPS / 400 nits	`5M11N61052`	FRU	View parts relationships and substitutes

Battery architecture

Architecture: Not recorded
Chemistry: Li-ion
Capacity: 57 Wh

Listing scope	Component	P/N listed for this model	Lenovo FRU flag
Exact configuration 21KC000BJP	Internal battery	`5B11H56383`	FRU	View parts relationships and substitutes	Search Japan marketplaces by battery P/NAmazon JapanOpen external site in a new tab Rakuten Ichiba (Japan)Open external site in a new tab Yahoo! Shopping (Japan)Open external site in a new tab Mercari (Japan)Open external site in a new tab Yahoo! Auctions (Japan)Open external site in a new tabExternal sitesPR

Each row is a platform configuration option. Simultaneous installation is not inferred.

Power and AC adapter

Connector: USB-C Power Delivery 3.0
Wattage: 45 W / 65 W

Wireless and WWAN

WLAN options: Intel Wi-Fi 6E AX211, 802.11ax 2x2 Wi-Fi and Bluetooth 5.3
Intel Wi-Fi 7 BE200, 802.11be 2x2 Wi-Fi and Bluetooth 5.3
WWAN: Configuration-dependent
Retrofit / conditions: Retrofit conditions apply
WWAN options: Wireless WAN upgradable to 4G or 5G with antenna ready
Quectel EM160R-GL 4G LTE CAT16 with embedded eSIM
Quectel RM520N-GL 5G Sub-6 GHz with embedded eSIM
No support

Ports and docking

Ports: 2x USB-A 5Gbps, one Always On
2x Thunderbolt 4 / USB4 40Gbps with USB Power Delivery 3.0 and DisplayPort 2.1
HDMI 2.1 up to 4K at 60Hz
Headphone / microphone combo jack
Optional nano-SIM card slot on WWAN models
Docking support: Various docking solutions supported via Thunderbolt or USB-C

Dimensions and weight

All configurations: 312.8 × 214.75 × 14.96 mm
Models with Trackpad: 1.08 kg / Starting weight
Models with Haptic Touchpad: 1.09 kg / Starting weight

Official maintenance documentation and key procedures

ThinkPad X1 Carbon Gen 12 Hardware Maintenance ManualOpen external site in a new tabFirst Edition · 2023-12Scope: Direct PDF identifies ThinkPad X1 Carbon Gen 12 only; the current Lenovo Guides listing describes X1 Carbon Gen 12 and X1 2-in-1 Gen 9

Key procedures

Base cover: p.62
Built-in battery: p.63–64
M.2 SSD: p.64–65
Display assembly: p.79–80
Keyboard: p.80

Part number information

Part numbers and their relationships to this product or model are shown when verified in official Lenovo sources.

Official Model-listed parts

Not collected

KATABAN.FYI has not yet collected official Model-listed parts for this product. This is not evidence that no compatible parts exist.

Display: View display parts
Battery: View battery parts
Keyboard / bezel: View keyboard parts

Model / MTM

5341

Codes listed in Lenovo Models identify a relationship to this product. They do not establish exact CPU, memory, storage or other configuration details.

Model / MTM codes verified in official sources: 5341
Exact configuration data: 1

Enter a code to search the official Lenovo Models data for this product.

Model / MTM with recorded exact specifications

Exact specifications recorded

These are sold configurations listed in Lenovo Models. They are not serial-number or as-built configurations. Each value comes directly from the applicable Model / MTM row.

Model / MTM	Machine Type	Region / Country/Region	Processor	Graphics	Memory	Storage	Display	Touchscreen	WLAN / Bluetooth	WWAN	OS	Official evidence
`21KC000BJP`	`21KC`	JAPAN / Japan	Intel Core Ultra 5 125U, 12C (2P + 8E + 2LPE) / 14T, Max Turbo up to 4.3GHz, 12MB Intel Smart Cache	Integrated Intel Graphics	16GB Soldered LPDDR5X-6400	256GB SSD M.2 2280 PCIe 4.0x4 NVMe Opal 2.0	14" WUXGA (1920x1200) IPS 400nits Anti-glare, 100% sRGB, 60Hz, Low Power	None	Intel Wi-Fi 6E AX211, 802.11ax 2x2 + BT5.3, vPro	WWAN Not Supported	Windows 11 Pro, Japanese	Lenovo Models

Evidence

6 sources. Of 13 product claims, 13 are verified with high confidence.Display, battery and keyboard parts relationships each show their state as verified in official sources. Procedure coverage in official maintenance documentation is audited per product for major components.