CPUBoss Review Our evaluation of 940 vs E8400 among desktop CPUs

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

3.8

CPUBoss Score

Combination of all six facets

Winner
Intel Core2 Duo E8400 

CPUBoss recommends the Intel Core2 Duo E8400  based on its performance and single-core performance.

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VS

Differences What are the advantages of each

Front view of Intel Pentium D 940

Reasons to consider the
Intel Pentium D 940

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Higher clock speed 3.2 GHz vs 3 GHz More than 5% higher clock speed
Significantly better overclocked clock speed (Water) 4.6 GHz vs 4.23 GHz Around 10% better overclocked clock speed (Water)
Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Much better PassMark score 2,160 vs 710 More than 3x better PassMark score
Much better PassMark (Single core) score 1,251 vs 758 More than 65% better PassMark (Single core) score
Much newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per watt 1.83 pt/W vs 0.44 pt/W Around 4.2x better performance per watt
Much lower typical power consumption 52.81W vs 105.63W 2x lower typical power consumption
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Significantly higher Maximum operating temperature 72.4 °C vs 68.6 °C More than 5% higher Maximum operating temperature
Much lower annual commercial energy cost 56.94 $/year vs 113.88 $/year 2x lower annual commercial energy cost
Much lower annual home energy cost 15.66 $/year vs 31.32 $/year 2x lower annual home energy cost
Newer Jan, 2008 vs Jan, 2006 Release date over 2 years later

Benchmarks Real world tests of Pentium D 940 vs Core2 Duo E8400

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Pentium D 940  vs
Core2 Duo E8400 
Clock speed 3.2 GHz 3 GHz
Cores Dual core Dual core
Socket type
LGA 775

features

Has a NX bit Yes Yes
Supports trusted computing No Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 130W 65W
Annual home energy cost 31.32 $/year 15.66 $/year
Annual commercial energy cost 113.88 $/year 56.94 $/year
Performance per watt 0.44 pt/W 1.83 pt/W
Typical power consumption 105.63W 52.81W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 800 MHz 1,333 MHz

details

Pentium D 940  vs
Core2 Duo E8400 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 4 MB 6 MB
L2 cache per core 2 MB/core 3 MB/core
Manufacture process 65 nm 45 nm
Transistor count 376,000,000 410,000,000
Max CPUs 1 1
Clock multiplier 16 9
Voltage range 1.2 - 1.34V 0.85 - 1.36V
Operating temperature Unknown - 68.6°C Unknown - 72.4°C

overclocking

Overclocked clock speed 4.25 GHz 4.22 GHz
Overclocked clock speed (Water) 4.6 GHz 4.23 GHz
Overclocked clock speed (Air) 4.25 GHz 4.22 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A
Intel Pentium D 940
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Intel Core2 Duo E8400
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