EPYC 7643 vs Celeron B840

Primary details

Comparing Celeron B840 and EPYC 7643 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	2782	38
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	6.32
Market segment	Laptop	Server
Series	Intel Celeron	AMD EPYC
Power efficiency	1.64	20.14
Architecture codename	Sandy Bridge (2011−2013)	Milan (2021−2023)
Release date	1 July 2011 (13 years ago)	12 January 2021 (3 years ago)
Launch price (MSRP)	$86	$4,995

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Celeron B840 and EPYC 7643 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	2 (Dual-core)	48 (Octatetraconta-Core)
Threads	2	96
Base clock speed	1.9 GHz	2.3 GHz
Boost clock speed	1.9 GHz	3.6 GHz
Bus type	DMI 2.0	no data
Bus rate	4 × 5 GT/s	no data
Multiplier	19	23
L1 cache	128 KB	3 MB
L2 cache	512 KB	24 MB
L3 cache	2 MB (shared)	256 MB (shared)
Chip lithography	32 nm	7 nm+
Die size	131 mm2	8x 81 mm2
Maximum core temperature	100 °C	no data
Number of transistors	504 million	33,200 million
64 bit support	+	+
Windows 11 compatibility	-	+

Compatibility

Information on Celeron B840 and EPYC 7643 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	FCPGA988,PGA988	SP3
Power consumption (TDP)	35 Watt	225 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Celeron B840 and EPYC 7643. You'll probably need this information if you require some particular technology.

AES-NI	-	+
FMA	+	-
AVX	-	+
Enhanced SpeedStep (EIST)	+	no data
My WiFi	+	no data
Turbo Boost Technology	-	no data
Hyper-Threading Technology	-	no data
Idle States	+	no data
Thermal Monitoring	+	-
Flex Memory Access	+	no data
Demand Based Switching	-	no data
FDI	+	no data
Fast Memory Access	+	no data

Security technologies

Celeron B840 and EPYC 7643 technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	no data
EDB	+	no data
Anti-Theft	-	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Celeron B840 and EPYC 7643 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Celeron B840 and EPYC 7643. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR4-3200
Maximum memory size	16 GB	4 TiB
Max memory channels	2	no data
Maximum memory bandwidth	21.335 GB/s	204.795 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel® HD Graphics for 2nd Generation Intel® Processors	N/A
Graphics max frequency	1 GHz	no data

Graphics interfaces

Available interfaces and connections of Celeron B840 and EPYC 7643 integrated GPUs.

Number of displays supported	2	no data
eDP	+	no data
DisplayPort	+	-
HDMI	+	-
SDVO	+	no data
CRT	+	no data

Peripherals

Specifications and connection of peripherals supported by Celeron B840 and EPYC 7643.

PCIe version	2.0	4.0
PCI Express lanes	16	128

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.

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Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

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Pros & cons summary

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Performance score	0.63	49.69
Recency	1 July 2011	12 January 2021
Physical cores	2	48
Threads	2	96
Chip lithography	32 nm	7 nm
Power consumption (TDP)	35 Watt	225 Watt

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Should you still have questions on choice between Celeron B840 and EPYC 7643, ask them in Comments section, and we shall answer.

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