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Differences What are the advantages of each

Front view of Intel Xeon L5639

Reasons to consider the
Intel Xeon L5639

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Significantly higher clock speed 2.13 GHz vs 1.86 GHz Around 15% higher clock speed
Much more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
More cores 6 vs 4 2 more cores; run more applications at once
Much better performance per watt 11.16 pt/W vs 3.43 pt/W More than 3.2x better performance per watt
Much better performance per dollar 2.23 pt/$ vs 0.31 pt/$ Around 7.2x better performance per dollar
More threads 12 vs 4 Three times as many threads
Much better overclocked clock speed (Air) 3.46 GHz vs 2.83 GHz More than 20% better overclocked clock speed (Air)
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Significantly better overclocked clock speed (Water) 2.13 GHz vs 1.87 GHz Around 15% better overclocked clock speed (Water)
Front view of Intel Xeon L5609

Reasons to consider the
Intel Xeon L5609

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Much more l3 cache per core 3 MB/core vs 2 MB/core 50% more l3 cache per core
Lower typical power consumption 32.5W vs 48.75W Around 35% lower typical power consumption
Lower annual commercial energy cost 35.04 $/year vs 52.56 $/year Around 35% lower annual commercial energy cost
Lower annual home energy cost 9.64 $/year vs 14.45 $/year Around 35% lower annual home energy cost

Benchmarks Real world tests of Xeon L5639 vs L5609

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon L5639
14,645
Xeon L5609
7,865

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon L5639
2,085
Xeon L5609
2,423

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon L5639
1,390,000 MB/s
Xeon L5609
1,510 MB/s

Specifications Full list of technical specs

summary

Xeon L5639  vs
L5609 
Clock speed 2.13 GHz 1.86 GHz
Cores Hexa core Quad core
Socket type
LGA 1366

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

bus

Architecture QPI QPI
Number of links 2 2
Data rate 46,928 MB/s 38,400 MB/s
Transfer rate 5,860 MT/s 4,800 MT/s
Clock speed 2,933 MHz 2,400 MHz

details

Xeon L5639  vs
L5609 
Threads 12 4
L2 cache 2 MB 1 MB
L2 cache per core 0.33 MB/core 0.25 MB/core
L3 cache 12 MB 12 MB
L3 cache per core 2 MB/core 3 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 2

overclocking

Overclocked clock speed 3.46 GHz 2.83 GHz
Overclocked clock speed (Water) 2.13 GHz 1.87 GHz
Overclocked clock speed (Air) 3.46 GHz 2.83 GHz

power consumption

TDP 60W 40W
Annual home energy cost 14.45 $/year 9.64 $/year
Annual commercial energy cost 52.56 $/year 35.04 $/year
Performance per watt 11.16 pt/W 3.43 pt/W
Typical power consumption 48.75W 32.5W
Intel Xeon L5639
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Intel Xeon L5609
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