CPUBoss Review Our evaluation of L5420 vs Q8400 among all CPUs

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Sky Diver and Cloud Gate

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

No winner declared

Too close to call

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VS

Differences What are the advantages of each

Front view of Intel Xeon L5420

Reasons to consider the
Intel Xeon L5420

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Much more l2 cache 12 MB vs 4 MB 3x more l2 cache; more data can be stored in the l2 cache for quick access later
Much lower typical power consumption 40.63W vs 135.97W 3.3x lower typical power consumption
Much more l2 cache per core 3 MB/core vs 1 MB/core 3x more l2 cache per core
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much lower annual home energy cost 12.04 $/year vs 51.39 $/year 4.3x lower annual home energy cost
Much lower annual commercial energy cost 43.8 $/year vs 130.79 $/year 3x lower annual commercial energy cost
Better performance per watt 2.75 pt/W vs 0.94 pt/W Around 3x better performance per watt
Slightly better overclocked clock speed (Air) 3.67 GHz vs 3.48 GHz More than 5% better overclocked clock speed (Air)
Front view of Intel Core2 Quad Q8400

Reasons to consider the
Intel Core2 Quad Q8400

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Slightly higher clock speed 2.66 GHz vs 2.5 GHz More than 5% higher clock speed
Much better performance per dollar 0.79 pt/$ vs 0.33 pt/$ More than 2.2x better performance per dollar
Higher Maximum operating temperature 71.4 °C vs 57 °C More than 25% higher Maximum operating temperature
Newer Apr, 2009 vs Mar, 2008 Release date over 1 years later

Benchmarks Real world tests of Xeon L5420 vs Core2 Quad Q8400

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 L5420
107,200 MB/s
Core2 Quad Q8400
113,900 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon L5420  vs
Core2 Quad Q8400 
Clock speed 2.5 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 No
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 50W 95W
Annual home energy cost 12.04 $/year 51.39 $/year
Annual commercial energy cost 43.8 $/year 130.79 $/year
Performance per watt 2.75 pt/W 0.94 pt/W
Typical power consumption 40.63W 135.97W

bus

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

details

Xeon L5420  vs
Core2 Quad Q8400 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 12 MB 4 MB
L2 cache per core 3 MB/core 1 MB/core
Manufacture process 45 nm 45 nm
Transistor count 820,000,000 456,000,000
Max CPUs 2 1
Clock multiplier 7 8
Voltage range 0.85 - 1.35V 0.85 - 1.36V
Operating temperature Unknown - 57°C Unknown - 71.4°C

overclocking

Overclocked clock speed 3.67 GHz 3.48 GHz
Overclocked clock speed (Water) 3.85 GHz 3.91 GHz
Overclocked clock speed (Air) 3.67 GHz 3.48 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 L5420
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Intel Core2 Quad Q8400
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