Pentium D 945 vs Xeon E5-2420

Primary details

Comparing Xeon E5-2420 and Pentium D 945 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1617	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	1.03	no data
Market segment	Server	Desktop processor
Power efficiency	3.14	no data
Architecture codename	Sandy Bridge-EN (2012)	Presler (2005−2007)
Release date	14 May 2012 (12 years ago)	23 July 2006 (18 years ago)
Launch price (MSRP)	$390	$163

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon E5-2420 and Pentium D 945 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	6 (Hexa-Core)	2 (Dual-core)
Threads	12	2
Base clock speed	1.9 GHz	3.4 GHz
Boost clock speed	2.4 GHz	3.4 GHz
Bus rate	7.2 GT/s	no data
L1 cache	64 KB (per core)	16 KB (per core)
L2 cache	256 KB (per core)	2 MB (per die)
L3 cache	15360 KB (shared)	0 KB
Chip lithography	32 nm	65 nm
Die size	294 mm2	2x 81 mm2
Maximum case temperature (TCase)	no data	63 °C
Number of transistors	1,270 million	376 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	no data	1.2V-1.3375V

Compatibility

Information on Xeon E5-2420 and Pentium D 945 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	1
Socket	FCLGA1356	LGA775,PLGA775
Power consumption (TDP)	95 Watt	95 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5-2420 and Pentium D 945. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® AVX	no data
AES-NI	+	-
AVX	+	-
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	1.0	-
Hyper-Threading Technology	+	-
Idle States	+	+
Thermal Monitoring	+	-
Flex Memory Access	-	no data
Demand Based Switching	+	-
PAE	no data	32 Bit
FSB parity	no data	-

Security technologies

Xeon E5-2420 and Pentium D 945 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon E5-2420 and Pentium D 945 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E5-2420 and Pentium D 945. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR1, DDR2, DDR3
Maximum memory size	384 GB	no data
Max memory channels	3	no data
Maximum memory bandwidth	32 GB/s	no data
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

On certain motherboards (Chipset feature)

Peripherals

Specifications and connection of peripherals supported by Xeon E5-2420 and Pentium D 945.

PCIe version	3.0	no data
PCI Express lanes	24	no data

Pros & cons summary

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Recency	14 May 2012	23 July 2006
Physical cores	6	2
Threads	12	2
Chip lithography	32 nm	65 nm

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Should you still have questions on choice between Xeon E5-2420 and Pentium D 945, ask them in Comments section, and we shall answer.

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