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Differences What are the advantages of each

Front view of Intel Xeon 5138

Reasons to consider the
Intel Xeon 5138

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Much lower typical power consumption 28.44W vs 77.19W 2.7x lower typical power consumption
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much more l2 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l2 cache per core
Much lower annual home energy cost 8.43 $/year vs 22.89 $/year 2.7x lower annual home energy cost
Much lower annual commercial energy cost 30.66 $/year vs 83.22 $/year 2.7x lower annual commercial energy cost
Front view of Intel Core2 Quad Q9400

Reasons to consider the
Intel Core2 Quad Q9400

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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 newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 2.66 GHz vs 2.13 GHz Around 25% higher clock speed
Much better overclocked clock speed (Air) 3.54 GHz vs 2.13 GHz More than 65% better overclocked clock speed (Air)
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
More cores 4 vs 2 Twice as many cores; run more applications at once
Much better overclocked clock speed (Water) 4.15 GHz vs 2.13 GHz Around 95% better overclocked clock speed (Water)
More threads 4 vs 2 Twice as many threads
Newer Jul, 2008 vs Dec, 2006 Release date over 1 years later

Features Key features of the Xeon 5138  vs Core2 Quad Q9400 

clock speed

Xeon 5138
2.13 GHz
Core2 Quad Q9400
2.66 GHz

L2 cache

overclocked clock speed (air)

Xeon 5138
2.13 GHz
Core2 Quad Q9400
3.54 GHz

overclocked clock speed (water)

Xeon 5138
2.13 GHz
Core2 Quad Q9400
4.15 GHz

Specifications Full list of technical specs

summary

Xeon 5138  vs
Core2 Quad Q9400 
Clock speed 2.13 GHz 2.66 GHz
Cores Dual 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 35W 95W
Annual home energy cost 8.43 $/year 22.89 $/year
Annual commercial energy cost 30.66 $/year 83.22 $/year
Typical power consumption 28.44W 77.19W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 1,066 MHz 1,333 MHz

details

Xeon 5138  vs
Core2 Quad Q9400 
Architecture x86-64 x86-64
Threads 2 4
L2 cache 4 MB 6 MB
L2 cache per core 2 MB/core 1.5 MB/core
Manufacture process 65 nm 45 nm
Transistor count 291,000,000 456,000,000
Max CPUs 2 1
Clock multiplier 8 8
Voltage range 1 - 1.5V 0.85 - 1.36V
Operating temperature Unknown - 70.8°C Unknown - 71.4°C

overclocking

Overclocked clock speed 2.13 GHz 3.54 GHz
Overclocked clock speed (Water) 2.13 GHz 4.15 GHz
Overclocked clock speed (Air) 2.13 GHz 3.54 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 5138
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Intel Core2 Quad Q9400
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