EPYC 7251 vs Atom C3955

Primary details

Comparing Atom C3955 and EPYC 7251 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1500	813
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.94	2.85
Market segment	Server	Server
Series	Intel Atom	AMD EPYC
Power efficiency	10.79	7.41
Architecture codename	Goldmont (2016−2017)	Naples (2017−2018)
Release date	15 August 2017 (7 years ago)	20 June 2017 (7 years ago)
Launch price (MSRP)	$434	$574

Cost-effectiveness evaluation

Performance per price, higher is better.

EPYC 7251 has 203% better value for money than Atom C3955.

Detailed specifications

Atom C3955 and EPYC 7251 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	16 (Hexadeca-Core)	8 (Octa-Core)
Threads	16	16
Base clock speed	2.1 GHz	2.1 GHz
Boost clock speed	2.4 GHz	2.1 GHz
Multiplier	21	21
L1 cache	896 KB	768 KB
L2 cache	16 MB	4 MB
L3 cache	16 MB	32 MB (shared)
Chip lithography	14 nm	14 nm
Die size	no data	213 mm2
Maximum core temperature	78 °C	no data
Number of transistors	no data	19200 Million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	-	+

Compatibility

Information on Atom C3955 and EPYC 7251 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 (Multiprocessor)
Socket	FCBGA1310	TR4
Power consumption (TDP)	32 Watt	120 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Atom C3955 and EPYC 7251. You'll probably need this information if you require some particular technology.

AES-NI	+	+
AVX	-	+
Enhanced SpeedStep (EIST)	+	no data
QuickAssist	-	no data
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	-	no data

Security technologies

Atom C3955 and EPYC 7251 technologies aimed at improving security, for example, by protecting against hacks.

EDB	+	no data
Secure Boot	+	no data
Secure Key	+	no data
SGX	-	no data
OS Guard	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Atom C3955 and EPYC 7251 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 Atom C3955 and EPYC 7251. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4: 2400	DDR4 Eight-channel
Maximum memory size	256 GB	2 TiB
Max memory channels	2	8
Maximum memory bandwidth	38.397 GB/s	153.652 GB/s
ECC memory support	+	+

Peripherals

Specifications and connection of peripherals supported by Atom C3955 and EPYC 7251.

PCIe version	3	3.0
PCI Express lanes	16	128
USB revision	3	no data
Total number of SATA ports	16	no data
Max number of SATA 6 Gb/s Ports	16	no data
Number of USB ports	8	no data
Integrated LAN	4x10/2.5/1 GBE	no data

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	3.65	9.40
Recency	15 August 2017	20 June 2017
Physical cores	16	8
Power consumption (TDP)	32 Watt	120 Watt

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Should you still have questions on choice between Atom C3955 and EPYC 7251, ask them in Comments section, and we shall answer.

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