CPUBoss Review Our evaluation of E5405 vs E8400


Benchmark performance using all cores

PassMark and GeekBench

Single-core Performance

Individual core benchmark performance

PassMark (Single Core)

Power Consumption

How much power does the processor require?



Performance Per Dollar

No winner declared

Too close to call

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Differences What are the advantages of each

Front view of Intel Xeon E5405

Reasons to consider the
Intel Xeon E5405

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Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
More cores 4 vs 2 Twice as many cores; run more applications at once
Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Significantly higher clock speed 3 GHz vs 2 GHz 50% higher clock speed
Much better performance per dollar 26.09 pt/$ vs 9.02 pt/$ Around 3x better performance per dollar
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Better PassMark (Single core) score 1,257 vs 866 More than 45% better PassMark (Single core) score
Lower typical power consumption 52.81W vs 65W Around 20% lower typical power consumption
Higher Maximum operating temperature 72.4 °C vs 67 °C Around 10% higher Maximum operating temperature
Lower annual commercial energy cost 56.94 $/year vs 70.08 $/year Around 20% lower annual commercial energy cost
Lower annual home energy cost 15.66 $/year vs 19.27 $/year Around 20% lower annual home energy cost

Benchmarks Real world tests of Xeon E5405 vs Core2 Duo E8400

GeekBench (32-bit) Data courtesy Primate Labs


PassMark Data courtesy PassMark

PassMark (Single Core) Data courtesy PassMark

Specifications Full list of technical specs


Xeon E5405  vs
Core2 Duo E8400 
Clock speed 2 GHz 3 GHz
Cores Quad core Dual core
Socket type
LGA 771
LGA 775


Has a NX bit Yes Yes
Supports trusted computing No Yes
Has virtualization support Yes Yes
Instruction set extensions
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 80W 65W
Annual home energy cost 19.27 $/year 15.66 $/year
Annual commercial energy cost 70.08 $/year 56.94 $/year
Performance per watt 5.41 pt/W 5.62 pt/W
Typical power consumption 65W 52.81W


Xeon E5405  vs
Core2 Duo E8400 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 12 MB 6 MB
L2 cache per core 3 MB/core 3 MB/core
Manufacture process 45 nm 45 nm
Transistor count 820,000,000 410,000,000
Max CPUs 2 1
Clock multiplier 6 9
Voltage range 0.85 - 1.35V 0.85 - 1.36V
Operating temperature Unknown - 67°C Unknown - 72.4°C

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


Architecture FSB FSB
Number of links 1 1
Clock speed 1,333 MHz 1,333 MHz
Intel Xeon E5405
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Intel Core2 Duo E8400
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