Pentium D 820 vs Xeon E5620

Primary details

Comparing Xeon E5620 and Pentium D 820 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1813	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.08	no data
Market segment	Server	Desktop processor
Series	no data	Pentium D
Power efficiency	2.67	no data
Architecture codename	Westmere-EP (2010−2011)	Smithfield (2005)
Release date	16 March 2010 (14 years ago)	May 2005 (19 years ago)
Launch price (MSRP)	$35	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon E5620 and Pentium D 820 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)	2 (Dual-core)
Threads	8	2
Base clock speed	2.4 GHz	2.8 GHz
Boost clock speed	2.66 GHz	2.8 GHz
Bus rate	no data	800 MHz
L1 cache	64 KB (per core)	28 KB
L2 cache	256 KB (per core)	2 MB
L3 cache	12 MB (shared)	0 KB
Chip lithography	32 nm	90 nm
Die size	239 mm2	206 mm2
Maximum core temperature	78 °C	64 °C
Number of transistors	1,170 million	169 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	no data	1.2V-1.4V

Compatibility

Information on Xeon E5620 and Pentium D 820 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	2	2
Socket	FCLGA1366,LGA1366	PLGA775
Power consumption (TDP)	80 Watt	95 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5620 and Pentium D 820. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2	no data
AES-NI	+	-
Enhanced SpeedStep (EIST)	+	-
Turbo Boost Technology	1.0	-
Hyper-Threading Technology	+	-
Idle States	+	+
Demand Based Switching	+	-
PAE	40 Bit	32 Bit
FSB parity	no data	-

Security technologies

Xeon E5620 and Pentium D 820 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon E5620 and Pentium D 820 are enumerated here.

VT-d	+	-
VT-x	+	-
EPT	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E5620 and Pentium D 820. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR1, DDR2, DDR3
Maximum memory size	288 GB	no data
Max memory channels	3	no data
Maximum memory bandwidth	25.6 GB/s	no data
ECC memory support	+	-

Peripherals

Specifications and connection of peripherals supported by Xeon E5620 and Pentium D 820.

PCIe version

2.0

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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Pros & cons summary

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Physical cores	4	2
Threads	8	2
Chip lithography	32 nm	90 nm
Power consumption (TDP)	80 Watt	95 Watt

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