EPYC 9255 vs i5-6400

Primary details

Comparing Core i5-6400 and EPYC 9255 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1551	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.66	no data
Market segment	Desktop processor	Server
Series	Intel Core i5	no data
Power efficiency	4.96	no data
Architecture codename	Skylake (2015−2016)	Turin (2024)
Release date	2 July 2015 (9 years ago)	10 October 2024 (less than a year ago)
Launch price (MSRP)	$187	$2,495

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i5-6400 and EPYC 9255 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	4 (Quad-Core)	24 (Tetracosa-Core)
Threads	4	48
Base clock speed	2.7 GHz	3.25 GHz
Boost clock speed	3.3 GHz	4.8 GHz
Bus type	DMI 3.0	no data
Bus rate	4 × 8 GT/s	no data
Multiplier	27	no data
L1 cache	64K (per core)	80 KB (per core)
L2 cache	256K (per core)	1 MB (per core)
L3 cache	6 MB (shared)	128 MB (shared)
Chip lithography	14 nm	4 nm
Die size	177 mm2	4x 70.6 mm2
Maximum case temperature (TCase)	72 °C	no data
Number of transistors	no data	33,260 million
64 bit support	+	+
Windows 11 compatibility	-	no data

Compatibility

Information on Core i5-6400 and EPYC 9255 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 (Uniprocessor)	2
Socket	FCLGA1151	SP5
Power consumption (TDP)	65 Watt	200 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i5-6400 and EPYC 9255. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2	no data
AES-NI	+	+
AVX	+	+
vPro	+	no data
Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	-	no data
Idle States	+	no data
Thermal Monitoring	+	-
Precision Boost 2	no data	+

Security technologies

Core i5-6400 and EPYC 9255 technologies aimed at improving security, for example, by protecting against hacks.

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

Virtualization technologies

Virtual machine speed-up technologies supported by Core i5-6400 and EPYC 9255 are enumerated here.

AMD-V	+	+
VT-d	+	no data
VT-x	+	no data
EPT	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i5-6400 and EPYC 9255. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3, DDR4	DDR5
Maximum memory size	64 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	34.134 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel HD Graphics 530	N/A
Max video memory	64 GB	no data
Quick Sync Video	+	-
Clear Video	+	no data
Clear Video HD	+	no data
Graphics max frequency	950 MHz	no data
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i5-6400 and EPYC 9255 integrated GPUs.

Number of displays supported	3	no data
eDP	+	no data
DisplayPort	+	-
HDMI	+	-
DVI	+	no data

Graphics image quality

Maximum display resolutions supported by Core i5-6400 and EPYC 9255 integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	no data
Max resolution over HDMI 1.4	4096x2304@24Hz	no data
Max resolution over eDP	4096x2304@60Hz	no data
Max resolution over DisplayPort	4096x2304@60Hz	no data
Max resolution over VGA	N/A	no data

Graphics API support

APIs supported by Core i5-6400 and EPYC 9255 integrated GPUs, sometimes API versions are included.

DirectX	12	no data
OpenGL	4.5	no data

Peripherals

Specifications and connection of peripherals supported by Core i5-6400 and EPYC 9255.

PCIe version	3.0	5.0
PCI Express lanes	16	128

Pros & cons summary

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Recency	2 July 2015	10 October 2024
Physical cores	4	24
Threads	4	48
Chip lithography	14 nm	4 nm
Power consumption (TDP)	65 Watt	200 Watt

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