Celeron B820 vs i7-840QM

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Aggregate performance score

Core i7-840QM
2010
4 cores / 8 threads, 45 Watt
1.23
+146%
Celeron B820
2012
2 cores / 2 threads, 35 Watt
0.50

Core i7-840QM outperforms Celeron B820 by a whopping 146% based on our aggregate benchmark results.

Primary details

Comparing Core i7-840QM and Celeron B820 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking23252889
Place by popularitynot in top-100not in top-100
Market segmentLaptopLaptop
SeriesIntel Core i7Intel Celeron
Power efficiency2.591.35
Architecture codenameClarksfield (2009−2010)Sandy Bridge (2011−2013)
Release date22 June 2010 (14 years ago)1 July 2012 (12 years ago)
Launch price (MSRP)$568$86

Detailed specifications

Core i7-840QM and Celeron B820 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)
Threads82
Base clock speed1.86 GHz1.7 GHz
Boost clock speed3.2 GHz1.7 GHz
Bus typeDMI 1.0DMI 2.0
Bus rate2.5 GT/s4 × 5 GT/s
Multiplier1417
L1 cache256 KB128 KB
L2 cache1 MB512 KB
L3 cache8 MB (shared)2 MB (shared)
Chip lithography45 nm32 nm
Die size296 mm2131 mm2
Maximum core temperature100 °C100 °C
Number of transistors774 million504 million
64 bit support++
Windows 11 compatibility--

Compatibility

Information on Core i7-840QM and Celeron B820 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 configuration1 (Uniprocessor)1 (Uniprocessor)
SocketFCPGA988,PGA988FCPGA988,PGA988
Power consumption (TDP)45 Watt35 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-840QM and Celeron B820. You'll probably need this information if you require some particular technology.

Instruction set extensionsIntel® SSE4.2Intel® SSE4.1, Intel® SSE4.2
FMA-+
vPro+no data
Enhanced SpeedStep (EIST)++
My WiFino data-
Turbo Boost Technology+-
Hyper-Threading Technology+-
Idle States++
Thermal Monitoring++
Flex Memory Accessno data+
Demand Based Switchingno data-
PAE36 Bitno data
FDIno data+
Fast Memory Accessno data+

Security technologies

Core i7-840QM and Celeron B820 technologies aimed at improving security, for example, by protecting against hacks.

TXT+-
EDB++
Anti-Theftno data-

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-840QM and Celeron B820 are enumerated here.

VT-d+-
VT-x++
EPT+no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-840QM and Celeron B820. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3DDR3
Maximum memory size8 GB16 GB
Max memory channels22
Maximum memory bandwidth21.335 GB/s21.335 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardNoneIntel HD Graphics for 2nd Generation Intel Processors
Graphics max frequencyno data1.05 GHz

Graphics interfaces

Available interfaces and connections of Core i7-840QM and Celeron B820 integrated GPUs.

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

Peripherals

Specifications and connection of peripherals supported by Core i7-840QM and Celeron B820.

PCIe version22.0
PCI Express lanes1616

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.

i7-840QM 1.23
+146%
Celeron B820 0.50

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.

i7-840QM 1952
+143%
Celeron B820 802

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.

i7-840QM 386
+37.9%
Celeron B820 280

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.

i7-840QM 1044
+112%
Celeron B820 492

Gaming performance

Pros & cons summary


Performance score 1.23 0.50
Recency 22 June 2010 1 July 2012
Physical cores 4 2
Threads 8 2
Chip lithography 45 nm 32 nm
Power consumption (TDP) 45 Watt 35 Watt

i7-840QM has a 146% higher aggregate performance score, and 100% more physical cores and 300% more threads.

Celeron B820, on the other hand, has an age advantage of 2 years, a 40.6% more advanced lithography process, and 28.6% lower power consumption.

The Core i7-840QM is our recommended choice as it beats the Celeron B820 in performance tests.


Should you still have questions on choice between Core i7-840QM and Celeron B820, ask them in Comments section, and we shall answer.

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Intel Core i7-840QM
Core i7-840QM
Intel Celeron B820
Celeron B820

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Community ratings

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


4.2 81 vote

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Questions & comments

Here you can ask a question about Core i7-840QM or Celeron B820, agree or disagree with our judgements, or report an error or mismatch.