Phenom II X4 955 (95W) vs Xeon E5645

Primary details

Comparing Xeon E5645 and Phenom II X4 955 (95W) processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1605	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	1.25	no data
Market segment	Server	Desktop processor
Power efficiency	3.76	no data
Architecture codename	Westmere-EP (2010−2011)	Deneb (2009−2011)
Release date	16 March 2010 (14 years ago)	1 April 2009 (15 years ago)
Launch price (MSRP)	$294	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon E5645 and Phenom II X4 955 (95W) 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)	4 (Quad-Core)
Threads	12	4
Base clock speed	2.4 GHz	3.2 GHz
Boost clock speed	2.67 GHz	3.2 GHz
L1 cache	64 KB (per core)	128 KB (per core)
L2 cache	256 KB (per core)	512 KB (per core)
L3 cache	12 MB (shared)	6 MB (shared)
Chip lithography	32 nm	45 nm
Die size	239 mm2	258 mm2
Maximum core temperature	76 °C	no data
Number of transistors	1,170 million	758 million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Xeon E5645 and Phenom II X4 955 (95W) 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	FCLGA1366,LGA1366	AM3
Power consumption (TDP)	80 Watt	95 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5645 and Phenom II X4 955 (95W). 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)	+	no data
Turbo Boost Technology	1.0	no data
Hyper-Threading Technology	+	no data
Idle States	+	no data
Demand Based Switching	+	no data
PAE	40 Bit	no data

Security technologies

Xeon E5645 and Phenom II X4 955 (95W) technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	no data
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon E5645 and Phenom II X4 955 (95W) are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E5645 and Phenom II X4 955 (95W). Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3
Maximum memory size	288 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 E5645 and Phenom II X4 955 (95W).

PCIe version

2.0

2.0

Pros & cons summary

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Recency	16 March 2010	1 April 2009
Physical cores	6	4
Threads	12	4
Chip lithography	32 nm	45 nm
Power consumption (TDP)	80 Watt	95 Watt

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Should you still have questions on choice between Xeon E5645 and Phenom II X4 955 (95W), ask them in Comments section, and we shall answer.

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