AMD Athlon II X4 651 vs Phenom II X4 840T

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Combined performance score

Phenom II X4 840T
1.49

Athlon II X4 651 outperforms Phenom II X4 840T by 56% in our combined benchmark results.

General info

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

Place in performance ranking20241672
Place by popularitynot in top-100not in top-100
Value for money2.280.73
Market segmentDesktop processorDesktop processor
Architecture codenameZosma (2010−2011)Llano (2011−2012)
Release date1 September 2010 (13 years old)14 November 2011 (12 years old)
Launch price (MSRP)$80no data
Current price$40 (0.5x MSRP)$71
Value for money

Performance per price, higher is better.

Phenom II X4 840T has 212% better value for money than Athlon II X4 651.

Technical specs

Phenom II X4 840T 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 cores4 (Quad-Core)4 (Quad-Core)
Threads44
Base clock speed2.9 GHz3 GHz
Boost clock speed3.2 GHz3 GHz
L1 cache128 KB (per core)128 KB (per core)
L2 cache512 KB (per core)1 MB (per core)
L3 cache6 MB (shared)0 KB
Chip lithography45 nm32 nm
Die size346 mm2228 mm2
Number of transistors904 million1,178 million
64 bit support++
Windows 11 compatibility--
Unlocked multiplierNoNo

Compatibility

Information on Phenom II X4 840T 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 configuration11
SocketAM3FM1
Power consumption (TDP)95 Watt100 Watt

Virtualization technologies

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

AMD-V++

Memory specs

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

Supported memory typesDDR3DDR3

Peripherals

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

PCIe version2.0no 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.


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.

Phenom II X4 840T 1.49
Athlon II X4 651 2.33
+56.4%

Athlon II X4 651 outperforms Phenom II X4 840T by 56% in our combined benchmark results.


Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Benchmark coverage: 68%

Phenom II X4 840T 2286
Athlon II X4 651 3584
+56.8%

Athlon II X4 651 outperforms Phenom II X4 840T by 57% in Passmark.

Gaming performance

Advantages and disadvantages


Performance score 1.49 2.33
Recency 1 September 2010 14 November 2011
Chip lithography 45 nm 32 nm
Power consumption (TDP) 95 Watt 100 Watt

The Athlon II X4 651 is our recommended choice as it beats the Phenom II X4 840T in performance tests.


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

User ratings

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite CPU.


AMD Phenom II X4 840T
Phenom II X4 840T
AMD Athlon II X4 651
Athlon II X4 651

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User ratings: view and submit

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3.4 36 votes

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Questions and comments

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