Celeron B840 vs Athlon II X4 651

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A4-3300 A4-3400 A6-3500 A6-3600 A6-3650 A8-3800 A8-3850 A8-3870K Athlon II X4 631 Athlon II X4 641 Athlon II X4 651 E2-3200
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Aggregate performance score

Athlon II X4 651
2011
4 cores / 4 threads, 100 Watt
2.26
+270%
Celeron B840
2011
2 cores / 2 threads, 35 Watt
0.61

Athlon II X4 651 outperforms Celeron B840 by a whopping 270% based on our aggregate benchmark results.

Contents

Athlon II X4 651 Athlon II X4 651
Celeron B840 Celeron B840

Primary details

Comparing Athlon II X4 651 and Celeron B840 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking18152785
Place by popularitynot in top-100not in top-100
Market segmentDesktop processorLaptop
Seriesno dataIntel Celeron
Power efficiency2.141.65
Architecture codenameLlano (2011−2012)Sandy Bridge (2011−2013)
Release date14 November 2011 (13 years ago)1 July 2011 (13 years ago)
Launch price (MSRP)no data$86

Detailed specifications

Athlon II X4 651 and Celeron B840 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)2 (Dual-core)
Threads42
Base clock speed3 GHz1.9 GHz
Boost clock speed3 GHz1.9 GHz
Bus typeno dataDMI 2.0
Bus rateno data4 × 5 GT/s
Multiplierno data19
L1 cache128 KB (per core)64K (per core)
L2 cache1 MB (per core)256K (per core)
L3 cache0 KB2 MB (shared)
Chip lithography32 nm32 nm
Die size228 mm2131 mm2
Maximum core temperatureno data100 °C
Number of transistors1,178 million504 million
64 bit support++
Windows 11 compatibility--

Compatibility

Information on Athlon II X4 651 and Celeron B840 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 (Uniprocessor)
SocketFM1FCPGA988,PGA988
Power consumption (TDP)100 Watt35 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Athlon II X4 651 and Celeron B840. You'll probably need this information if you require some particular technology.

FMA-+
Enhanced SpeedStep (EIST)no data+
My WiFino data+
Turbo Boost Technologyno data-
Hyper-Threading Technologyno data-
Idle Statesno data+
Thermal Monitoring-+
Flex Memory Accessno data+
Demand Based Switchingno data-
FDIno data+
Fast Memory Accessno data+

Security technologies

Athlon II X4 651 and Celeron B840 technologies aimed at improving security, for example, by protecting against hacks.

TXTno data-
EDBno data+
Anti-Theftno data-

Virtualization technologies

Virtual machine speed-up technologies supported by Athlon II X4 651 and Celeron B840 are enumerated here.

AMD-V+-
VT-dno data-
VT-xno data+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Athlon II X4 651 and Celeron B840. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3DDR3
Maximum memory sizeno data16 GB
Max memory channelsno data2
Maximum memory bandwidthno data21.335 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardno dataIntel® HD Graphics for 2nd Generation Intel® Processors
Graphics max frequencyno data1 GHz

Graphics interfaces

Available interfaces and connections of Athlon II X4 651 and Celeron B840 integrated GPUs.

Number of displays supportedno data2
eDPno data+
DisplayPort-+
HDMI-+
SDVOno data+
CRTno data+

Peripherals

Specifications and connection of peripherals supported by Athlon II X4 651 and Celeron B840.

PCIe versionno data2.0
PCI Express lanesno data16

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.

Athlon II X4 651 2.26
+270%
Celeron B840 0.61

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.

Athlon II X4 651 3584
+271%
Celeron B840 967

GeekBench 5 Single-Core

GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.

Athlon II X4 651 333
+1.5%
Celeron B840 328

GeekBench 5 Multi-Core

GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.

Athlon II X4 651 1108
+85.6%
Celeron B840 597

Gaming performance

Pros & cons summary

Performance score 2.26 0.61
Recency 14 November 2011 1 July 2011
Physical cores 4 2
Threads 4 2
Power consumption (TDP) 100 Watt 35 Watt

Athlon II X4 651 has a 270.5% higher aggregate performance score, an age advantage of 4 months, and 100% more physical cores and 100% more threads.

Celeron B840, on the other hand, has 185.7% lower power consumption.

The Athlon II X4 651 is our recommended choice as it beats the Celeron B840 in performance tests.

Note that Athlon II X4 651 is a desktop processor while Celeron B840 is a notebook one.

Should you still have questions on choice between Athlon II X4 651 and Celeron B840, ask them in Comments section, and we shall answer.

Vote for your favorite

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

AMD Athlon II X4 651
Athlon II X4 651
Intel Celeron B840
Celeron B840
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Community ratings

Here you can see how users rate the processors, as well as rate them yourself.

3.9 185 votes

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Questions & comments

Here you can ask a question about Athlon II X4 651 or Celeron B840, agree or disagree with our judgements, or report an error or mismatch.