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A silver rectangular CPU with gold contacts on the underside and a green substrate visible around the edges

Intel

Intel Core i5-8400 SR3QT desktop processor

SKU CH-TP1A-XBZ7C

Six-core Coffee Lake desktop processor for LGA 1151 boards, running at 2.8 GHz with 9 MB cache and 65 W TDP

  • CPU cores6-Core
  • CPU socketLGA 1151
  • TDP rating65 W
  • Processor classProcessor
  • Processor codenameCoffee Lake
  • CPU threads6-Threads
  • Six cores handle parallel workloads efficiently
  • Base clock of 2.8 GHz provides steady compute performance
  • 9 MB L3 cache reduces data latency
  • 65 W thermal design keeps power draw moderate
  • Supports up to 128 GB of DDR4 memory

Six-core desktop processor for everyday workloads

The Intel Core i5-8400 delivers six cores and six threads at a base frequency of 2.8 GHz. It fits the LGA 1151 socket and supports dual-channel DDR4 2666 memory up to 128 GB. A 65 W thermal design power keeps cooling requirements modest for typical builds.

Sustained multi-threaded performance at fixed power

With six physical cores the chip handles parallel workloads such as compilation, rendering or virtualisation without relying on short burst speeds. The 9 MB L3 cache reduces latency when data sets exceed individual core caches. Thermal output remains steady at the rated 65 W during extended sessions.

LGA 1151 mounting and mainstream platform

The processor drops into existing LGA 1151 motherboards that support the Coffee Lake architecture. Dual memory channels and a maximum capacity of 128 GB give flexibility for memory-heavy applications. The 65 W envelope allows standard tower coolers to maintain low noise levels in daily use.

How it compares

Measured against everything we stock in Desktop Processors, at today’s prices. Recalculated every night.

Price $41.99
Cheaper than about 90% of the 494 comparable items (median $149.99).
CPU cores 6-Core
Lower than about 80% of the 271 comparable items (median 8).
TDP rating 65 W
Lower than about 60% of the 320 comparable items (median 95 W).

New to this? Buying a processor with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameIntel
Performance
Working frequency2.8 GHz
Processor
CPU cores6-Core
CPU socketLGA 1151
TDP rating65 W
Processor classProcessor
Processor codenameCoffee Lake
CPU threads6-Threads
Level 3 cache9 MB
Memory
Supported memoryDDR4 2666
Channel configuration2
Memory limit128 GB

Questions about this item

How loud and hot does the 65W i5-8400 get when it runs all day?

The processor has a 65W thermal design power, so a standard LGA 1151 cooler keeps temperatures and fan noise modest during continuous loads.

What motherboard and memory must I already own for this LGA 1151 CPU to work?

You need an LGA 1151 socket motherboard and DDR4 2666 modules; the controller supports two channels up to 128 GB total.

Will the i5-8400 run on my older LGA 1155 board alongside my existing parts?

No, the i5-8400 requires an LGA 1151 socket; it is physically and electrically incompatible with LGA 1155 motherboards.

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