i5-655K vs Xeon E3-1275

Primary details

Comparing Xeon E3-1275 and Core i5-655K processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1535	2287
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	1.08	no data
Market segment	Server	Desktop processor
Power efficiency	3.46	1.65
Architecture codename	Sandy Bridge (2011−2013)	Clarkdale (2010−2011)
Release date	3 April 2011 (13 years ago)	30 May 2010 (14 years ago)
Launch price (MSRP)	$450	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon E3-1275 and Core i5-655K 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	4
Base clock speed	3.4 GHz	3.2 GHz
Boost clock speed	3.8 GHz	3.46 GHz
Bus rate	no data	2.5 GT/s
L1 cache	64 KB (per core)	64 KB (per core)
L2 cache	256 KB (per core)	256 KB (per core)
L3 cache	8 MB (shared)	4 MB (shared)
Chip lithography	32 nm	32 nm
Die size	216 mm2	81 mm2
Maximum core temperature	73 °C	73 °C
Number of transistors	1,160 million	382 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	-	+

Compatibility

Information on Xeon E3-1275 and Core i5-655K 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	1	1
Socket	LGA1155	FCLGA1156
Power consumption (TDP)	95 Watt	73 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E3-1275 and Core i5-655K. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX	Intel® SSE4.2
AES-NI	+	+
AVX	+	-
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	2.0	1.0
Hyper-Threading Technology	+	+
Idle States	+	+
Thermal Monitoring	+	-
Flex Memory Access	+	no data
Demand Based Switching	+	-
PAE	no data	36 Bit
FDI	+	+
Fast Memory Access	+	no data

Security technologies

Xeon E3-1275 and Core i5-655K technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Identity Protection	+	-

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon E3-1275 and Core i5-655K are enumerated here.

VT-d	+	+
VT-x	+	+
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E3-1275 and Core i5-655K. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3
Maximum memory size	32 GB	16.38 GB
Max memory channels	2	2
Maximum memory bandwidth	21 GB/s	21 GB/s
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel HD P3000	Intel HD Graphics for Previous Generation Intel Processors
Quick Sync Video	+	-
Clear Video HD	+	+
Graphics max frequency	1.35 GHz	no data
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Xeon E3-1275 and Core i5-655K integrated GPUs.

Number of displays supported

2

2

Peripherals

Specifications and connection of peripherals supported by Xeon E3-1275 and Core i5-655K.

PCIe version	2.0	2.0
PCI Express lanes	20	16

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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Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

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Pros & cons summary

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Performance score	3.47	1.27
Recency	3 April 2011	30 May 2010
Physical cores	4	2
Threads	8	4
Power consumption (TDP)	95 Watt	73 Watt

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Should you still have questions on choice between Xeon E3-1275 and Core i5-655K, ask them in Comments section, and we shall answer.

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