Intel Core i5-8259U

Laptop CPUIntel

Also called intel core i5-8259u, core i5-8259u, i5-8259u, core-i5-8259u

IntelLaptop CPUCoffee Lake

Intel Core i5 laptop processor on Coffee Lake, with 4 cores and 8 threads and 6 MB L3 at 28 W TDP on a 14 nm process addressing up to 32 GB and Intel Iris Plus Graphics 655.

What you need to know

Intel Core i5-8259U is a legacy laptop cpu.

Intel Core i5-8259U launched in April 1, 2018., It has 4 cores and 8 threads on Coffee Lake, dropping into the FCBGA1528 socket. Treat the spec table as the facts. Age alone does not tell you to throw it out.

Still good?: Only if the workload is light
Product age: 8 years old
Upgrade pressure: 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: Average. Laptop performance depends on the OEM power limit as much as this SKU name.
Product age 8 years old: Legacy. Launched April 1, 2018. 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: Moderate. Upgrade pressure comes from platform features and specific CPU-bound work, not from the chip being unusable.

Where does it sit?

Coffee 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: Average

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

Multithreaded workloads: Average

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

General use: Good

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 Core i5-8259U is built on Coffee Lake using a 14 nm process.

Intel Core i5-8259U specifications: Processor
Manufacturer	Intel
Family	Core i5
Architecture	Coffee Lake
Generation	8th Generation Intel Core i5 Processors
Manufacturing process	14 nm
Segment	Laptop

Cores and threads

Intel Core i5-8259U has 4 cores and 8 threads.

Intel Core i5-8259U specifications: Cores and threads
Cores	4
Threads	8

Clock speeds

Base clock is 2.3 GHz. Boost reaches 3.8 GHz.

Intel Core i5-8259U specifications: Clock speeds
Base frequency	2.3 GHz
Max boost	3.8 GHz

Cache

Cache on this sheet is 6 MB L3.

Intel Core i5-8259U specifications: Cache
L3 cache	6 MB
Total cache	6 MB

Memory

Intel Core i5-8259U addresses 32 GB across 2 memory channels.

Intel Core i5-8259U specifications: Memory
Supported types	DDR4, LPDDR3
Max capacity	32 GB
Channels	2

Package and power

Intel Core i5-8259U uses the FCBGA1528 socket and a 28 W TDP.

Intel Core i5-8259U specifications: Package and power
Socket	FCBGA1528
TDP	28 W
PCIe	Revision 3.0, 16 lanes

Integrated graphics

Intel Core i5-8259U includes Intel Iris Plus Graphics 655.

Intel Core i5-8259U specifications: Integrated graphics
Integrated graphics	Intel Iris Plus Graphics 655

Market

Intel Core i5-8259U launched April 1, 2018.

Intel Core i5-8259U specifications: Market
Launch date	April 1, 2018
Model	i5-8259U

Features

Intel Core i5-8259U records 20 instruction sets on this sheet.

Intel Core i5-8259U specifications: Features
Instruction sets	AES-NIAVX2AVXFMA64-bit (x86-64)BMI1BMI2F16CPCLMULQDQRDRANDRDSEEDSSE4.1SSE4.2x86-64-v3SSESSE2SSE3SSSE3x86-64-v2MMX
Security	Execute Disable (NX)Hardware RNGOS GuardSGXTrusted Execution
Virtualization	Extended Page Tables (EPT)VT-d (DMA Remapping)VT-x (Hardware Virtualization)Second-Level Address Translation

Compatibility

Compatibility
Socket	FCBGA1528
Board	A shared socket is not automatic compatibility. Check the motherboard CPU list and BIOS revision.
Memory	DDR4, LPDDR3, up to 32 GB
Graphics	Intel Iris Plus Graphics 655

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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