Intel Xeon D-1581 vs Intel Xeon L5520

Comparative analysis of Intel Xeon D-1581 and Intel Xeon L5520 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-1581

Intel Xeon L5520

Differences

Reasons to consider the Intel Xeon D-1581

CPU is newer: launch date 6 year(s) 11 month(s) later
A newer manufacturing process allows for a more powerful, yet cooler running processor: 14 nm vs 45 nm
16x more L1 cache, more data can be stored in the L1 cache for quick access later
16x more L2 cache, more data can be stored in the L2 cache for quick access later
3x more L3 cache, more data can be stored in the L3 cache for quick access later
Around 53% better performance in PassMark - Single thread mark: 1482 vs 969
2.9x better performance in PassMark - CPU mark: 13282 vs 4561

Specifications (specs)
Launch date	Feb 2016 vs March 2009
Manufacturing process technology	14 nm vs 45 nm
L1 cache	1 MB vs 64 KB (per core)
L2 cache	4 MB vs 256 KB (per core)
L3 cache	24 MB vs 8192 KB (shared)
Benchmarks
PassMark - Single thread mark	1482 vs 969
PassMark - CPU mark	13282 vs 4561

Reasons to consider the Intel Xeon L5520

Around 3% higher clock speed: 2.48 GHz vs 2.40 GHz
Around 13% higher maximum memory size: 144 GB vs 128 GB
Around 8% lower typical power consumption: 60 Watt vs 65 Watt

Maximum frequency	2.48 GHz vs 2.40 GHz
Maximum memory size	144 GB vs 128 GB
Max number of CPUs in a configuration	2 vs 1
Thermal Design Power (TDP)	60 Watt vs 65 Watt

Compare benchmarks

CPU 1: Intel Xeon D-1581
CPU 2: Intel Xeon L5520

PassMark - Single thread mark

CPU 1

CPU 2

1482

969

PassMark - CPU mark

CPU 1

CPU 2

13282

4561

Name	Intel Xeon D-1581	Intel Xeon L5520
PassMark - Single thread mark	1482	969
PassMark - CPU mark	13282	4561
Geekbench 4 - Single Core		2032
Geekbench 4 - Multi-Core		6619

Compare specifications (specs)

	Intel Xeon D-1581	Intel Xeon L5520
Essentials
Architecture codename	Broadwell	Nehalem EP
Launch date	Feb 2016	March 2009
Place in performance rating	1355	1360
Processor Number	D-1581	L5520
Series	Intel Xeon D Processor	Legacy Intel® Xeon® Processors
Status	Launched	Launched
Vertical segment	Server	Server
Launch price (MSRP)		$100
Price now		$12.92
Value for money (0-100)		100.00
Performance
64 bit support
Base frequency	1.80 GHz	2.26 GHz
L1 cache	1 MB	64 KB (per core)
L2 cache	4 MB	256 KB (per core)
L3 cache	24 MB	8192 KB (shared)
Manufacturing process technology	14 nm	45 nm
Maximum frequency	2.40 GHz	2.48 GHz
Bus Speed		5.86 GT/s QPI
Die size		263 mm2
Maximum core temperature		70°C
Number of cores		4
Number of QPI Links		2
Number of threads		8
Transistor count		731 million
VID voltage range		0.75V -1.35V
Memory
Max memory channels	2	3
Maximum memory size	128 GB	144 GB
Supported memory frequency	2133 MHz
Supported memory types	DDR4, DDR3	DDR3 800/1066
ECC memory support
Maximum memory bandwidth		25.6 GB/s
Compatibility
Max number of CPUs in a configuration	1	2
Package Size	37.5 mm x 37.5 mm	42.5mm x 45mm
Sockets supported	FCBGA1667	FCLGA1366
Thermal Design Power (TDP)	65 Watt	60 Watt
Low Halogen Options Available
Peripherals
Integrated LAN
Max number of PCIe lanes	32
Number of USB ports	8
PCI Express revision	2.0/3.0
PCIe configurations	x4 x8 x16
Scalability	1S Only
Total number of SATA ports	6
UART
USB revision	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 64
Intel® AES New Instructions
Intel® Hyper-Threading technology
Intel® Turbo Boost technology
Thermal Monitoring
Intel® Demand Based Switching
Physical Address Extensions (PAE)		40-bit
Virtualization
Intel® Virtualization Technology (VT-x)
Intel® Virtualization Technology for Directed I/O (VT-d)
Intel® VT-x with Extended Page Tables (EPT)