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Differences What are the advantages of each

Front view of Intel Xeon 7040

Reasons to consider the
Intel Xeon 7040

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Supports more CPUs in SMP configuration 32 vs 1 31 supports more CPUs in SMP configuration
More threads 4 vs 2 Twice as many threads
Slightly higher Maximum operating temperature 76 °C vs 72.4 °C Around 5% higher Maximum operating temperature
Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l2 cache 6 MB vs 4 MB 50% more l2 cache; more data can be stored in the l2 cache for quick access later
Much lower typical power consumption 52.81W vs 134.06W 2.5x lower typical power consumption
Much more l2 cache per core 3 MB/core vs 2 MB/core 50% more l2 cache per core
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Significantly better overclocked clock speed (Air) 4.22 GHz vs 3 GHz More than 40% better overclocked clock speed (Air)
Much lower annual home energy cost 15.66 $/year vs 39.75 $/year 2.5x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 144.54 $/year 2.5x lower annual commercial energy cost
Newer Jan, 2008 vs Nov, 2005 Release date over 2 years later
Significantly better overclocked clock speed (Water) 4.23 GHz vs 3 GHz More than 40% better overclocked clock speed (Water)

Features Key features of the Xeon 7040  vs Core2 Duo E8400 

clock speed

L2 cache

overclocked clock speed (air)

Xeon 7040
3 GHz
Core2 Duo E8400
4.22 GHz

overclocked clock speed (water)

Xeon 7040
3 GHz
Core2 Duo E8400
4.23 GHz

TDP

Specifications Full list of technical specs

summary

Xeon 7040  vs
Core2 Duo E8400 
Clock speed 3 GHz 3 GHz
Cores Dual core Dual core
Socket type
604
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 165W 65W
Annual home energy cost 39.75 $/year 15.66 $/year
Annual commercial energy cost 144.54 $/year 56.94 $/year
Typical power consumption 134.06W 52.81W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 667 MHz 1,333 MHz

details

Xeon 7040  vs
Core2 Duo E8400 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 4 MB 6 MB
L2 cache per core 2 MB/core 3 MB/core
Manufacture process 90 nm 45 nm
Transistor count 230,000,000 410,000,000
Max CPUs 32 1
Clock multiplier 18 9
Voltage range 1.26 - 1.41V 0.85 - 1.36V
Operating temperature Unknown - 76°C Unknown - 72.4°C

overclocking

Overclocked clock speed 3 GHz 4.22 GHz
Overclocked clock speed (Water) 3 GHz 4.23 GHz
Overclocked clock speed (Air) 3 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 Xeon 7040
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Intel Core2 Duo E8400
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