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Differences What are the advantages of each

Front view of Intel Xeon L5408

Reasons to consider the
Intel Xeon L5408

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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
Much lower typical power consumption 32.5W vs 77.19W 2.4x lower typical power consumption
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Better geekbench 3 Multi-Core score 6,095 vs 5,123 Around 20% better geekbench 3 Multi-Core score
Better performance per watt 3.41 pt/W vs 1.51 pt/W More than 2.2x better performance per watt
Much lower annual home energy cost 9.64 $/year vs 22.89 $/year 2.4x lower annual home energy cost
Much lower annual commercial energy cost 35.04 $/year vs 83.22 $/year 2.4x lower annual commercial energy cost
Front view of Intel Core2 Quad Q9400

Reasons to consider the
Intel Core2 Quad Q9400

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Higher clock speed 2.66 GHz vs 2.13 GHz Around 25% higher clock speed
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Much better performance per dollar 0.72 pt/$ vs 0.28 pt/$ More than 2.5x better performance per dollar
Slightly better geekbench 3 single core score 1,490 vs 1,324 Around 15% better geekbench 3 single core score
Better overclocked clock speed (Air) 3.54 GHz vs 3.34 GHz More than 5% better overclocked clock speed (Air)
Newer Jul, 2008 vs Feb, 2008 Release date 4 months later

Benchmarks Real world tests of Xeon L5408 vs Core2 Quad Q9400

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon L5408
105,400 MB/s
Core2 Quad Q9400
114,000 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon L5408  vs
Core2 Quad Q9400 
Clock speed 2.13 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 40W 95W
Annual home energy cost 9.64 $/year 22.89 $/year
Annual commercial energy cost 35.04 $/year 83.22 $/year
Performance per watt 3.41 pt/W 1.51 pt/W
Typical power consumption 32.5W 77.19W

bus

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

details

Xeon L5408  vs
Core2 Quad Q9400 
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 8 8
Voltage range 0.85 - 1.35V 0.85 - 1.36V
Operating temperature Unknown - 72°C Unknown - 71.4°C

overclocking

Overclocked clock speed 3.34 GHz 3.54 GHz
Overclocked clock speed (Water) 4.12 GHz 4.15 GHz
Overclocked clock speed (Air) 3.34 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 L5408
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Intel Core2 Quad Q9400
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