Intel Xeon D-1521 vs Intel Xeon D-1520

Comparative analysis of Intel Xeon D-1521 and Intel Xeon D-1520 processors for all known characteristics in the following categories: Essentials, Performance, Memory, Compatibility, Peripherals, Security & Reliability, Advanced Technologies, Virtualization. Benchmark processor performance analysis: PassMark - Single thread mark, PassMark - CPU mark, Geekbench 4 - Single Core, Geekbench 4 - Multi-Core.

Intel Xeon D-1521

Intel Xeon D-1520

Differences

Reasons to consider the Intel Xeon D-1521

Around 4% higher clock speed: 2.70 GHz vs 2.60 GHz
Around 30% better performance in PassMark - Single thread mark: 1655 vs 1270
Around 16% better performance in PassMark - CPU mark: 5699 vs 4917

Specifications (specs)
Maximum frequency	2.70 GHz vs 2.60 GHz
Benchmarks
PassMark - Single thread mark	1655 vs 1270
PassMark - CPU mark	5699 vs 4917

Compare benchmarks

CPU 1: Intel Xeon D-1521
CPU 2: Intel Xeon D-1520

PassMark - Single thread mark

CPU 1

CPU 2

1655

1270

PassMark - CPU mark

CPU 1

CPU 2

5699

4917

Name	Intel Xeon D-1521	Intel Xeon D-1520
PassMark - Single thread mark	1655	1270
PassMark - CPU mark	5699	4917
Geekbench 4 - Single Core		2155
Geekbench 4 - Multi-Core		7331

Compare specifications (specs)

	Intel Xeon D-1521	Intel Xeon D-1520
Essentials
Architecture codename	Broadwell	Broadwell
Launch date	Q4'15	Q1'15
Place in performance rating	1488	1242
Processor Number	D-1521	D-1520
Series	Intel® Xeon® D Processor	Intel® Xeon® D Processor
Status	Launched	Launched
Vertical segment	Server	Server
Performance
64 bit support
Base frequency	2.40 GHz	2.20 GHz
Manufacturing process technology	14 nm	14 nm
Maximum frequency	2.70 GHz	2.60 GHz
Number of cores	4	4
Number of threads	8	8
Maximum core temperature		80°C
Memory
Max memory channels	2	2
Maximum memory size	128 GB	128 GB
Supported memory frequency	2133 MHz	2133 MHz
Supported memory types	DDR4, DDR3	DDR4
Compatibility
Low Halogen Options Available
Max number of CPUs in a configuration	1	1
Package Size	37.5mm x 37.5mm	37.5mm x 37.5mm
Sockets supported	FCBGA1667	FCBGA1667
Thermal Design Power (TDP)	45 Watt	45 Watt
Peripherals
Integrated LAN
Max number of PCIe lanes	32	32
Number of USB ports	8	8
PCI Express revision	2.0/3.0	2.0/3.0
PCIe configurations	x4 x8 x16	x4 x8 x16
Scalability	1S Only	1S Only
Total number of SATA ports	6	6
UART
USB revision	2.0/3.0	2.0/3.0
Security & Reliability
Execute Disable Bit (EDB)
Intel® OS Guard
Intel® Secure Key technology
Intel® Trusted Execution technology (TXT)
Advanced Technologies
Enhanced Intel SpeedStep® technology
General-Purpose Input/Output (GPIO)
Idle States
Instruction set extensions	Intel® AVX2	Intel® AVX2
Intel 64
Intel® AES New Instructions
Intel® Hyper-Threading technology
Intel® TSX-NI
Intel® Turbo Boost technology
Thermal Monitoring
Virtualization
Intel® Virtualization Technology (VT-x)
Intel® Virtualization Technology for Directed I/O (VT-d)
Intel® VT-x with Extended Page Tables (EPT)