General information
Type	CPU / Microprocessor
Market segment	Desktop
Family	Intel Core i5
Model number	i5-8400
CPU part numbers	CM8068403358811 is an OEM/tray microprocessor
Frequency	2800 MHz
Maximum turbo frequency	4000 MHz (1 core) 3900 MHz (2, 3 or 4 cores) 3800 MHz (5 or 6 cores)
Low power frequency	800 MHz
Bus speed	8 GT/s DMI
Clock multiplier	28
Package	1151-land Flip-Chip Land Grid Array
Socket	Socket 1151 / H4 / LGA1151
Size	1.48" x 1.48" / 3.75cm x 3.75cm
Introduction date	September 24, 2017 (announcement) October 5, 2017 (availability)
S-spec numbers
Architecture / Microarchitecture
Microarchitecture	Coffee Lake
Processor core	Coffee Lake-S
Core stepping	U0 (SR3QT)
Manufacturing process	0.014 micron
Data width	64 bit
The number of CPU cores	6
The number of threads	6
Floating Point Unit	Integrated
Level 1 cache size	6 x 32 KB 8-way set associative instruction caches 6 x 32 KB 8-way set associative data caches
Level 2 cache size	6 x 256 KB 4-way set associative caches
Level 3 cache size	9 MB 12-way set associative shared cache
Physical memory	64 GB
Multiprocessing	Uniprocessor
Extensions and Technologies	MMX instructions SSE / Streaming SIMD Extensions SSE2 / Streaming SIMD Extensions 2 SSE3 / Streaming SIMD Extensions 3 SSSE3 / Supplemental Streaming SIMD Extensions 3 SSE4 / SSE4.1 + SSE4.2 / Streaming SIMD Extensions 4 AES / Advanced Encryption Standard instructions AVX / Advanced Vector Extensions AVX2 / Advanced Vector Extensions 2.0 BMI / BMI1 + BMI2 / Bit Manipulation instructions F16C / 16-bit Floating-Point conversion instructions FMA3 / 3-operand Fused Multiply-Add instructions EM64T / Extended Memory 64 technology / Intel 64 VT-x / Virtualization technology VT-d / Virtualization for directed I/O TBT 2.0 / Turbo Boost technology 2.0
Security Features	NX / XD / Execute disable bit MPX / Memory Protection Extensions SGX / Software Guard Extensions SMAP / Supervisor Mode Access Prevention SMEP / Secure Mode Execution Protection
Low power features	Core C1/C1E, C3, C6, C7, C8, C9 and C10 states Package C2, C3, C6, C7, C8, C9 and C10 states Enhanced SpeedStep technology
Integrated peripherals / components
Display controller	3 displays DVI / DisplayPort 1.2 / Embedded DisplayPort 1.4 / HDMI 1.4
Integrated graphics	GPU Type: Intel UHD 630 Graphics tier: GT2 Microarchitecture: Gen 9 LP Execution units: 23 Base frequency (MHz): 350 Maximum frequency (MHz): 1050
Memory controller	The number of controllers: 1 Memory channels: 2 Channel width (bits): 64 Supported memory: DDR4-2666 DIMMs per channel: 2 Maximum memory bandwidth (GB/s): 42.7
Other peripherals	Direct Media Interface 3.0 (4 lanes) PCI Express 3.0 interface (16 lanes)
Electrical / Thermal parameters
Minimum/Maximum operating temperature	0°C (case temperature) - 71.4°C (case temperature) 100°C (Digital Thermal Sensor)
Thermal Design Power	65 Watt
Notes on Intel Core i5-8400
Intel Optane memory is supported Package C10 low power state is not supported on 200 series chipsets The processor has the following security, data protection and/or software features: Intel Secure Key, Identity Protection technology, OS Guard and Boot Guard. The CPU is compatible with DirectX 12 and OpenGL 4.5 APIs. The graphics unit has the following software features enabled: Intel Quick Sync Video, Clear Video technology, Clear Video HD technology and InTru 3D technology.