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Core i5-8400
General Info
Designer	Intel
Manufacturer	Intel
Model Number	i5-8400
Part Number	BX80684I58400, BXC80684I58400, CM8068403358811, BOC80684I58400, BO80684I58400
S-Spec	SR3QT QNMN (QS)
Market	Desktop
Introduction	September 24, 2017 (announced) October 5, 2017 (launched)
Release Price	$182
Shop	Amazon
General Specs
Family	Core i5
Series	i5-8000
Locked	Yes
Frequency	2,800 MHz
Turbo Frequency	4,000 MHz (1 core), 3,900 MHz (2 cores), 3,900 MHz (3 cores), 3,900 MHz (4 cores), 3,800 MHz (5 cores), 3,800 MHz (6 cores)
Bus type	DMI 3.0
Bus rate	4 × 8 GT/s
Clock multiplier	28
Microarchitecture
ISA	x86-64 (x86)
Microarchitecture	Coffee Lake
Platform	Coffee Lake
Chipset	300 series
Core Name	Coffee Lake S
Core Family	6
Core Model	158
Core Stepping	U0
Process	14 nm
Technology	CMOS
Die	149 mm²
Word Size	64 bit
Cores	6
Threads	6
Max Memory	64 GiB
Multiprocessing
Max SMP	1-Way (Uniprocessor)
Electrical
TDP	65 W
Tjunction	0 °C – 100 °C
Tstorage	-25 °C – 125 °C
Packaging
Package FCLGA-1151 (LGA) FC-LGA14C Dimension 37.5 mm x 37.5 mm x 4.4 mm Pitch 0.914 mm Contacts 1151 Socket LGA-1151

Core i5-8400 is a 64-bit hexa-core mid-range performance x86 desktop microprocessor introduced by Intel in 2017. This processor, which is based on the Coffee Lake microarchitecture, is manufactured on Intel's 3rd generation enhanced 14nm++ process. The i5-8400 operates at a 2.8 GHz with a TDP of 65 W and a Turbo Boost frequency of up to 4 GHz. This chip supports up to 64 GiB of dual-channel non-ECC DDR4-2666 memory and incorporates Intel's UHD Graphics 630 IGP operating at 350 MHz with a burst frequency of 1.05 GHz.

A special variant of this model, called Core i5+ i5-8400 means it is part of a system equipped with Optane memory. Those models have part numbers BOC80684I58400 and BO80684I58400 and sell for $215. That variant was discontinued on January 14, 2019, with last order being September 30, 2019, and last shipment December 27, 2019.

Cache

Main article: Coffee Lake § Cache

[Edit/Modify Cache Info]

Cache Organization Cache is a hardware component containing a relatively small and extremely fast memory designed to speed up the performance of a CPU by preparing ahead of time the data it needs to read from a relatively slower medium such as main memory. The organization and amount of cache can have a large impact on the performance, power consumption, die size, and consequently cost of the IC. Cache is specified by its size, number of sets, associativity, block size, sub-block size, and fetch and write-back policies. Note: All units are in kibibytes and mebibytes.

L1$ 384 KiB 393,216 B 0.375 MiB L1I$ 192 KiB 196,608 B 0.188 MiB 6x32 KiB 8-way set associative   L1D$ 192 KiB 196,608 B 0.188 MiB 6x32 KiB 8-way set associative write-back L2$ 1.5 MiB 1,536 KiB 1,572,864 B 0.00146 GiB     6x256 KiB 4-way set associative write-back L3$ 9 MiB 9,216 KiB 9,437,184 B 0.00879 GiB     6x1.5 MiB 12-way set associative write-back

Memory controller

[Edit/Modify Memory Info]

	Integrated Memory Controller
	Max Type DDR4-2666 Supports ECC No Max Mem 64 gb Controllers 1 Channels 2 Max Bandwidth 39.74 GiB/s 40,693.76 MiB/s 42.671 GB/s 42,670.5 MB/s 0.0388 TiB/s 0.0427 TB/s Bandwidth Single 19.87 GiB/s Double 39.74 GiB/s

Expansions

[Edit/Modify Expansions Info]

	Expansion Options
PCIe Revision: 3.0 Max Lanes: 16 Configuration: 1x16, 2x8, 1x8+2x4

Graphics

[Edit/Modify IGP Info]

Integrated Graphics Information

GPU UHD Graphics 630 Designer Intel Device ID 0x3E92 Execution Units 24 Max Displays 3 Max Memory 64 GiB 65,536 MiB 67,108,864 KiB 68,719,476,736 B Frequency 350 MHz 0.35 GHz 350,000 KHz Burst Frequency 1,050 MHz 1.05 GHz 1,050,000 KHz Output DP, eDP, HDMI, DVI Max Resolution HDMI 4096x2304 @24 Hz DP 4096x2304 @60 Hz eDP 4096x2304 @60 Hz Standards DirectX 12 OpenGL 4.5 OpenCL 2.0 DP 1.2 eDP 1.4 HDMI 1.4a Additional Features Intel Quick Sync Video Intel InTru 3D Intel Clear Video Intel Clear Video HD

[Edit] Coffee Lake (Gen9.5) Hardware Accelerated Video Capabilities
Codec	Encode			Decode
	Profiles	Levels	Max Resolution	Profiles	Levels	Max Resolution
MPEG-2 (H.262)	Main	High	1080p (FHD)	Main	Main, High	1080p (FHD)
MPEG-4 AVC (H.264)	High, Main	5.1	2160p (4K)	Main, High, MVC, Stereo	5.1	2160p (4K)
JPEG/MJPEG	Baseline	-	16k x 16k	Baseline	Unified	16k x 16k
HEVC (H.265)	Main	5.1	2160p (4K)	Main, Main 10	5.1	2160p (4K)
VC-1	✘			Advanced, Main, Simple	3, High, Simple	3840x3840
VP8	Unified	Unified	N/A	0	Unified	1080p
VP9	0		2160p (4K)	0, 2	Unified	2160p (4K)

Features

[Edit/Modify Supported Features]

Supported x86 Extensions & Processor Features

MMX MMX Extension EMMX Extended MMX Extension SSE Streaming SIMD Extensions SSE2 Streaming SIMD Extensions 2 SSE3 Streaming SIMD Extensions 3 SSSE3 Supplemental SSE3 SSE4.1 Streaming SIMD Extensions 4.1 SSE4.2 Streaming SIMD Extensions 4.2 AVX Advanced Vector Extensions AVX2 Advanced Vector Extensions 2 ABM Advanced Bit Manipulation BMI1 Bit Manipulation Instruction Set 1 BMI2 Bit Manipulation Instruction Set 2 FMA3 3-Operand Fused-Multiply-Add AES AES Encryption Instructions RdRand Hardware RNG ADX Multi-Precision Add-Carry CLMUL Carry-less Multiplication Extension F16C 16-bit Floating Point Conversion x86-16 16-bit x86 x86-32 32-bit x86 x86-64 64-bit x86 Real Real Mode Protected Protected Mode SMM System Management Mode FPU Integrated x87 FPU NX No-eXecute TBT 2.0 Turbo Boost Technology 2.0 EIST Enhanced SpeedStep Technology VT-x VT-x (Virtualization) VT-d VT-d (I/O MMU virtualization) EPT Extended Page Tables (SLAT) MPX Memory Protection Extensions SGX Software Guard Extensions Secure Key Secure Key Technology SMEP OS Guard Technology IPT Identity Protection Technology

Frequencies

See also: Intel's CPU Frequency Behavior

[Modify Frequency Info]

Mode	Base	Turbo Frequency/Active Cores
		1	2	3	4	5	6
Normal	2,800 MHz	4,000 MHz	3,900 MHz	3,900 MHz	3,900 MHz	3,800 MHz	3,800 MHz

Die

See also: Coffee Lake § Die

A die shot of Intel's Coffee Lake Hexa Core desktop processors: