Intel Xeon W-11855M

Laptop CPUIntel

Also called intel xeon w-11855m, xeon w-11855m, w-11855m, xeon-w-11855m

IntelLaptop CPUTiger Lake

Intel Xeon W laptop processor on Tiger Lake, with 6 cores and 12 threads and 18 MB L3 on a 10 nm process addressing up to 128 GB and Intel UHD Graphics for 11th Gen Intel Processors.

What you need to know

Intel Xeon W-11855M is a aging laptop cpu.

Intel Xeon W-11855M launched in April 1, 2021., It has 6 cores and 12 threads on Tiger Lake, dropping into the FCBGA1787 socket. Treat the spec table as the facts. Age alone does not tell you to throw it out.

Still good?: Yes, for lighter work
Product age: 5 years old
Upgrade pressure: Low to moderate

Feex says

Laptop SKUs are power-limited. The name on the lid is not the same chip you would get on a desktop board.

What this hardware means today

Age and usefulness are not the same number. This page keeps them separate.

Performance today: Good. Laptop performance depends on the OEM power limit as much as this SKU name.
Product age 5 years old: Aging. Launched April 1, 2021. Newer platforms exist. That does not make this chip unusable by itself.
Support status: Supported. Current Windows and current applications still run on this class of CPU. Platform BIOS support depends on the motherboard or laptop vendor.
Upgrade pressure: Low to moderate. Upgrade pressure comes from platform features and specific CPU-bound work, not from the chip being unusable.

Where does it sit?

Tiger Lake sits on Intel's recent Core timeline. Later desktop branding moved toward Core Ultra.

11th Gen

12th Gen

13th Gen

14th Gen

Core Ultra

Performance context

These are qualitative readings, not a fake 8.7 out of 10. Workload still wins.

Gaming: Good

Fine when the laptop GPU is the limit. CPU names on thin laptops often are not.

Productivity: Good

6 cores cover office, browser, and compile work in this class.

Multithreaded workloads: Good

12 threads. Heavy encodes still scale further on higher-core parts.

General use: Excellent

Everyday Windows use is not where most people notice this SKU first.

Efficiency: Depends on the laptop

The same SKU in two laptops can draw very different power. Read the device, not the CPU name alone.

Should you upgrade?

Probably not based on CPU performance alone.

Upgrade makes more sense if

Your workload is strongly CPU limited
You need a newer platform for memory, I/O, or chipset features
You need substantially more multicore performance
You are buying a whole new laptop anyway

Upgrade makes less sense if

The GPU is the real bottleneck
Current applications are already responsive
The CPU rarely limits your workload

Specifications

Figures below follow the Feex Hardware Database record for this SKU. Fields without a recorded value are omitted.

Processor

Intel Xeon W-11855M is built on Tiger Lake using a 10 nm process.

Intel Xeon W-11855M specifications: Processor
Manufacturer	Intel
Family	Xeon W
Architecture	Tiger Lake
Generation	Intel Xeon W Processor
Manufacturing process	10 nm
Segment	Laptop

Cores and threads

Intel Xeon W-11855M has 6 cores and 12 threads.

Intel Xeon W-11855M specifications: Cores and threads
Cores	6
Threads	12

Clock speeds

Intel Xeon W-11855M boosts to 4.9 GHz.

Intel Xeon W-11855M specifications: Clock speeds
Max boost	4.9 GHz

Cache

Cache on this sheet is 18 MB L3.

Intel Xeon W-11855M specifications: Cache
L3 cache	18 MB
Total cache	18 MB

Memory

Intel Xeon W-11855M addresses 128 GB across 2 memory channels.

Intel Xeon W-11855M specifications: Memory
Max capacity	128 GB
Channels	2

Package and power

Intel Xeon W-11855M uses the FCBGA1787 socket.

Intel Xeon W-11855M specifications: Package and power
Socket	FCBGA1787
PCIe	20 lanes

Integrated graphics

Intel Xeon W-11855M includes Intel UHD Graphics for 11th Gen Intel Processors.

Intel Xeon W-11855M specifications: Integrated graphics
Integrated graphics	Intel UHD Graphics for 11th Gen Intel Processors

Market

Intel Xeon W-11855M launched April 1, 2021 at USD 450 (suggested price at launch).

Intel Xeon W-11855M specifications: Market
Launch date	April 1, 2021
Launch MSRP	USD 450 (suggested price at launch)
Model	W-11855M

Features

Intel Xeon W-11855M records 4 instruction sets on this sheet.

Intel Xeon W-11855M specifications: Features
Instruction sets	AVX-512AVX2SSE4.1SSE4.2
Security	Control-flow Enforcement (CET)Boot GuardHardware RNGOS GuardMode-Based Execute Control
Virtualization	Extended Page Tables (EPT)VT-d (DMA Remapping)VT-x (Hardware Virtualization)
AI acceleration	Gaussian Neural Accelerator

Compatibility

Compatibility
Socket	FCBGA1787
Board	A shared socket is not automatic compatibility. Check the motherboard CPU list and BIOS revision.
Memory	up to 128 GB
Graphics	Intel UHD Graphics for 11th Gen Intel Processors

A shared socket is not automatic compatibility. Boards often need a BIOS update before a newer chip in the same socket will post.

Laptop power limits, cooling, and the OEM firmware matter as much as the model name.

Read the memory list on the board. The CPU can list more standards than one motherboard will accept.

No post after a CPU swap

Clear CMOS only after you confirm the board list includes this SKU and the BIOS is new enough. A supported name on a box is not the same as a flashed board.

Sources and verification

Reviewed by Feex editorial. Last verified August 2026 Status: Partially Verified. How we research.

Feex Hardware Database · Specification source used for this sheet. CC BY 4.0.

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