Athlon II X4 651 vs i5-2500K

Primary details

Comparing Core i5-2500K and Athlon II X4 651 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1734	1830
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.39	no data
Market segment	Desktop processor	Desktop processor
Series	Core i5 (Desktop)	no data
Power efficiency	2.59	2.14
Architecture codename	Sandy Bridge (2011−2013)	Llano (2011−2012)
Release date	9 January 2011 (13 years ago)	14 November 2011 (13 years ago)
Launch price (MSRP)	$216	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i5-2500K and Athlon II X4 651 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)	4 (Quad-Core)
Threads	4	4
Base clock speed	3.3 GHz	3 GHz
Boost clock speed	3.7 GHz	3 GHz
Bus rate	5 GT/s	no data
L1 cache	64 KB (per core)	128 KB (per core)
L2 cache	256K (per core)	1 MB (per core)
L3 cache	6 MB (shared)	0 KB
Chip lithography	32 nm	32 nm
Die size	216 mm2	228 mm2
Maximum core temperature	73 °C	no data
Number of transistors	1,160 million	1,178 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	+	-

Compatibility

Information on Core i5-2500K and Athlon II X4 651 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	FM1
Power consumption (TDP)	95 Watt	100 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i5-2500K and Athlon II X4 651. You'll probably need this information if you require some particular technology.

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

Security technologies

Core i5-2500K and Athlon II X4 651 technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	no data
EDB	+	no data
Identity Protection	+	-

Virtualization technologies

Virtual machine speed-up technologies supported by Core i5-2500K and Athlon II X4 651 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 Core i5-2500K and Athlon II X4 651. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3
Maximum memory size	32 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	21 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel HD Graphics 3000	no data
Quick Sync Video	+	-
Clear Video HD	+	no data
Graphics max frequency	1.1 GHz	no data
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i5-2500K and Athlon II X4 651 integrated GPUs.

Number of displays supported

2

no data

Peripherals

Specifications and connection of peripherals supported by Core i5-2500K and Athlon II X4 651.

PCIe version	2.0	no data
PCI Express lanes	16	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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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	2.60	2.26
Recency	9 January 2011	14 November 2011
Power consumption (TDP)	95 Watt	100 Watt

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Should you still have questions on choice between Core i5-2500K and Athlon II X4 651, ask them in Comments section, and we shall answer.

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