Atom C3955 vs Xeon D-1521

Primary details

Comparing Xeon D-1521 and Atom C3955 processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	1420	1400
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.15	0.76
Market segment	Server	Server
Series	Intel Xeon D	Intel Atom
Architecture codename	Broadwell (2015−2019)	Goldmont (2016−2017)
Release date	1 November 2015 (8 years ago)	15 August 2017 (6 years ago)
Launch price (MSRP)	$199	$434
Current price	$2202 (11.1x MSRP)	$850 (2x MSRP)

Cost-effectiveness evaluation

Performance per price, higher is better.

Atom C3955 has 407% better value for money than Xeon D-1521.

Detailed specifications

Xeon D-1521 and Atom C3955 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)	16 (Hexadeca-Core)
Threads	8	16
Base clock speed	2.4 GHz	2.1 GHz
Boost clock speed	2.7 GHz	2.4 GHz
L1 cache	64K (per core)	896 KB
L2 cache	256K (per core)	16 MB
L3 cache	1.5 MB (per core)	16 MB
Chip lithography	14 nm	14 nm
Die size	246.24 mm2	no data
Maximum core temperature	no data	78 °C
Maximum case temperature (TCase)	80 °C	no data
Number of transistors	3,200 million	no data
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	No	No

Compatibility

Information on Xeon D-1521 and Atom C3955 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	FCBGA1667	FCBGA1310
Power consumption (TDP)	45 Watt	32 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon D-1521 and Atom C3955. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® AVX2	no data
AES-NI	+	+
AVX	+	no data
Enhanced SpeedStep (EIST)	+	+
QuickAssist	no data	-
Turbo Boost Technology	2.0	2.0
Hyper-Threading Technology	+	-
TSX	+	no data
Idle States	+	no data
Thermal Monitoring	+	no data
GPIO	+	no data
Status	Launched	Launched

Security technologies

Xeon D-1521 and Atom C3955 technologies aimed at improving security, for example, by protecting against hacks.

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

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon D-1521 and Atom C3955 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon D-1521 and Atom C3955. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4, DDR3	DDR4: 2400
Maximum memory size	128 GB	256 GB
Max memory channels	2	2
Maximum memory bandwidth	34.124 GB/s	38.397 GB/s
ECC memory support	+	+

Peripherals

Specifications and connection of peripherals supported by Xeon D-1521 and Atom C3955.

PCIe version	2.0/3.0	3
PCI Express lanes	32	16
USB revision	2.0/3.0	3
Total number of SATA ports	6	16
Max number of SATA 6 Gb/s Ports	no data	16
Number of USB ports	8	8
Integrated LAN	+	4x10/2.5/1 GBE
UART	+	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.

Atom C3955 outperforms Xeon D-1521 by 2% based on our aggregate benchmark results.

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Pros & cons summary

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Performance score	3.68	3.75
Recency	1 November 2015	15 August 2017
Physical cores	4	16
Threads	8	16
Cost	$199	$434
Power consumption (TDP)	45 Watt	32 Watt

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Should you still have questions on choice between Xeon D-1521 and Atom C3955, ask them in Comments section, and we shall answer.

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