Xeon D-1581 vs D-1521

Primary details

Comparing Xeon D-1521 and Xeon D-1581 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1519	912
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	2.60	no data
Market segment	Server	Server
Series	Intel Xeon D	Intel Xeon D
Power efficiency	7.53	12.16
Architecture codename	Broadwell (2015−2019)	Broadwell (2015−2019)
Release date	1 November 2015 (9 years ago)	24 February 2016 (8 years ago)
Launch price (MSRP)	$199	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon D-1521 and Xeon D-1581 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	32
Base clock speed	2.4 GHz	1.8 GHz
Boost clock speed	2.7 GHz	2.4 GHz
Bus type	DMI 2.0	DMI 2.0
Multiplier	24	18
L1 cache	256 KB	1 MB
L2 cache	1 MB	4 MB
L3 cache	6 MB	24 MB
Chip lithography	14 nm	14 nm
Die size	246.24 mm2	306.18 mm2
Maximum case temperature (TCase)	80 °C	80 °C
Number of transistors	3200 Million	4700 Million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Xeon D-1521 and Xeon D-1581 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)	1 (Uniprocessor)
Socket	FCBGA1667	FCBGA1667
Power consumption (TDP)	45 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon D-1521 and Xeon D-1581. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® AVX2	Intel® AVX2
AES-NI	+	+
AVX	+	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	2.0	2.0
Hyper-Threading Technology	+	+
TSX	+	+
Idle States	+	+
Thermal Monitoring	+	+
GPIO	+	+

Security technologies

Xeon D-1521 and Xeon D-1581 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Secure Key	+	+
OS Guard	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon D-1521 and Xeon D-1581 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon D-1521 and Xeon D-1581. Depending on the motherboard, higher memory frequencies may be supported.

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

Peripherals

Specifications and connection of peripherals supported by Xeon D-1521 and Xeon D-1581.

PCIe version	2.0/3.0	2.0/3.0
PCI Express lanes	24	24
USB revision	2.0/3.0	2.0/3.0
Total number of SATA ports	6	6
Number of USB ports	8	8
Integrated LAN	+	+
UART	+	+

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	3.58	8.35
Recency	1 November 2015	24 February 2016
Physical cores	4	16
Threads	8	32
Power consumption (TDP)	45 Watt	65 Watt

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Should you still have questions on choice between Xeon D-1521 and Xeon D-1581, ask them in Comments section, and we shall answer.

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