Athlon II X4 651K vs Athlon X4 840

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Primary details

Comparing Athlon X4 840 and Athlon II X4 651K processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking1873not rated
Place by popularitynot in top-100not in top-100
Market segmentDesktop processorDesktop processor
Series4x Athlonno data
Power efficiency3.04no data
Architecture codenameKaveri (2014−2015)Llano (2011−2012)
Release dateAugust 2014 (10 years ago)14 November 2011 (13 years ago)

Detailed specifications

Athlon X4 840 and Athlon II X4 651K 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 cores4 (Quad-Core)4 (Quad-Core)
Threads44
Base clock speed3.1 GHz3 GHz
Boost clock speed3.8 GHz3 GHz
L1 cache256K128 KB (per core)
L2 cache4 MB1 MB (per core)
L3 cacheno data0 KB
Chip lithography28 nm32 nm
Die size245 mm2228 mm2
Maximum case temperature (TCase)72 °Cno data
Number of transistors2,411 million1,178 million
64 bit support++
Windows 11 compatibility--
Unlocked multiplier+-

Compatibility

Information on Athlon X4 840 and Athlon II X4 651K 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 configuration11
SocketSocket FM2+FM1
Power consumption (TDP)65 watt100 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Athlon X4 840 and Athlon II X4 651K. You'll probably need this information if you require some particular technology.

AES-NI+-
FMA+-
AVX+-

Virtualization technologies

Virtual machine speed-up technologies supported by Athlon X4 840 and Athlon II X4 651K are enumerated here.

AMD-V++

Memory specs

Types, maximum amount and channel quantity of RAM supported by Athlon X4 840 and Athlon II X4 651K. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3DDR3

Peripherals

Specifications and connection of peripherals supported by Athlon X4 840 and Athlon II X4 651K.

PCIe version3.0no data
PCI Express lanes16no data

Pros & cons summary


Recency on August 2014 14 November 2011
Chip lithography 28 nm 32 nm
Power consumption (TDP) 65 Watt 100 Watt

Athlon X4 840 has an age advantage of 2 years, a 14.3% more advanced lithography process, and 53.8% lower power consumption.

We couldn't decide between Athlon X4 840 and Athlon II X4 651K. We've got no test results to judge.


Should you still have questions on choice between Athlon X4 840 and Athlon II X4 651K, ask them in Comments section, and we shall answer.

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AMD Athlon X4 840
Athlon X4 840
AMD Athlon II X4 651K
Athlon II X4 651K

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Community ratings

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3.8 615 votes

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3.6 32 votes

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Questions & comments

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