Core i9-11900KB vs Core i5-8400B

Primary details

Comparing Core i5-8400B and Core i9-11900KB processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	not rated	447
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Desktop processor
Series	Intel Core i5	no data
Architecture codename	Coffee Lake (2017−2019)	Tiger Lake-H (2021)
Release date	2 April 2018 (6 years ago)	May 2021 (3 years ago)
Launch price (MSRP)	$182	$539
Current price	$54 (0.3x MSRP)	no data

Detailed specifications

Core i5-8400B and Core i9-11900KB basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores	6 (Hexa-Core)	8 (Octa-Core)
Threads	6	16
Base clock speed	2.8 GHz	3.3 GHz
Boost clock speed	4 GHz	4.9 GHz
Bus support	4 × 8 GT/s	no data
L1 cache	384 KB	80K (per core)
L2 cache	1.5 MB	1.25 MB (per core)
L3 cache	9 MB	24 MB (shared)
Chip lithography	14 nm	10 nm SuperFin
Die size	126 mm2	190 mm2
Maximum core temperature	100 °C	100 °C
Maximum case temperature (TCase)	no data	72 °C
64 bit support	+	+
Windows 11 compatibility	+	-
Unlocked multiplier	No	Yes

Compatibility

Information on Core i5-8400B and Core i9-11900KB compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration	1	1
Socket	FCBGA1440	FCBGA1787
Power consumption (TDP)	65 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i5-8400B and Core i9-11900KB. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	+	+
AVX	+	+
Enhanced SpeedStep (EIST)	+	+
Speed Shift	no data	+
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	-	+
TSX	-	-
Idle States	+	+
Thermal Monitoring	+	+
Flex Memory Access	no data	+
SIPP	-	no data
Turbo Boost Max 3.0	no data	+
Status	Discontinued	Launched

Security technologies

Core i5-8400B and Core i9-11900KB technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	+
EDB	+	+
Secure Key	+	+
MPX	+	no data
Identity Protection	+	+
SGX	Yes with Intel® ME	Yes with Intel® ME
OS Guard	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i5-8400B and Core i9-11900KB are enumerated here.

VT-d	+	+
VT-x	+	+
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i5-8400B and Core i9-11900KB. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2666	DDR4
Maximum memory size	64 GB	128 GB
Max memory channels	2	2
Maximum memory bandwidth	42.671 GB/s	51.2 GB/s
ECC memory support	-	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel UHD Graphics 630	Intel® UHD Graphics for 11th Gen Intel® Processors
Max video memory	64 GB	no data
Quick Sync Video	+	+
Clear Video	+	no data
Clear Video HD	+	no data
Graphics max frequency	1.05 GHz	1.45 GHz
Execution Units	no data	32
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i5-8400B and Core i9-11900KB integrated GPUs.

Number of displays supported

3

4

Graphics image quality

Maximum display resolutions supported by Core i5-8400B and Core i9-11900KB integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	+
Max resolution over HDMI 1.4	4096x2304@30Hz	4096x2304@60Hz
Max resolution over eDP	4096x2304@60Hz	4096 x 2304@60Hz
Max resolution over DisplayPort	4096x2304@60Hz	7680x4320@60Hz

Graphics API support

APIs supported by Core i5-8400B and Core i9-11900KB integrated GPUs, sometimes API versions are included.

DirectX	12	12
OpenGL	4.5	4.6

Peripherals

Specifications and connection of peripherals supported by Core i5-8400B and Core i9-11900KB.

PCIe version	3.0	4.0
PCI Express lanes	16	20

Pros & cons summary

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Physical cores	6	8
Threads	6	16
Cost	$182	$539
Chip lithography	14 nm	10 nm

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Should you still have questions on choice between Core i5-8400B and Core i9-11900KB, ask them in Comments section, and we shall answer.

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