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Differences What are the advantages of each

Front view of Intel Xeon E5450

Reasons to consider the
Intel Xeon E5450

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Much more l2 cache 12 MB vs 6 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much more l2 cache per core 3 MB/core vs 1.5 MB/core 2x more l2 cache per core
Higher clock speed 3 GHz vs 2.66 GHz Around 15% higher clock speed
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Significantly better overclocked clock speed (Air) 3.83 GHz vs 2.67 GHz Around 45% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.1 GHz vs 2.67 GHz Around 55% better overclocked clock speed (Water)
Front view of Intel Core2 Quad Q9400S

Reasons to consider the
Intel Core2 Quad Q9400S

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Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Lower typical power consumption 52.81W vs 65W Around 20% lower typical power consumption
Higher Maximum operating temperature 76.3 °C vs 67 °C Around 15% higher Maximum operating temperature
Newer Jan, 2009 vs Nov, 2007 Release date over 1 years later
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

Features Key features of the Xeon E5450  vs Core2 Quad Q9400S 

clock speed

Xeon E5450
3 GHz

L2 cache

overclocked clock speed (air)

Xeon E5450
3.83 GHz

overclocked clock speed (water)

Xeon E5450
4.1 GHz

Specifications Full list of technical specs

summary

Xeon E5450  vs
Core2 Quad Q9400S 
Clock speed 3 GHz 2.66 GHz
Cores Quad core Quad core
Socket type
LGA 771
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 80W 65W
Annual home energy cost 19.27 $/year 15.66 $/year
Annual commercial energy cost 70.08 $/year 56.94 $/year
Typical power consumption 65W 52.81W

bus

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

details

Xeon E5450  vs
Core2 Quad Q9400S 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 12 MB 6 MB
L2 cache per core 3 MB/core 1.5 MB/core
Manufacture process 45 nm 45 nm
Transistor count 820,000,000 456,000,000
Max CPUs 2 1
Clock multiplier 9 8
Voltage range 0.85 - 1.35V 0.85 - 1.36V
Operating temperature Unknown - 67°C Unknown - 76.3°C

overclocking

Overclocked clock speed 3.83 GHz 2.67 GHz
Overclocked clock speed (Water) 4.1 GHz 2.67 GHz
Overclocked clock speed (Air) 3.83 GHz 2.67 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 E5450
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Intel Core2 Quad Q9400S
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