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Differences What are the advantages of each

Front view of Intel Xeon W3520

Reasons to consider the
Intel Xeon W3520

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Much newer manufacturing process 45 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better geekbench 2 (32-bit) score 6,599 vs 761 Around 8.8x better geekbench 2 (32-bit) score
More l3 cache 8 MB vs 0 MB Compared to all cpus, 8 MB l3 cache is just OK
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Higher clock speed 2.66 GHz vs 2.4 GHz More than 10% higher clock speed
Much more l3 cache per core 2 MB/core vs 0 MB/core Compared to all cpus, 2 MB/core l3 cache per core is just OK
Much better overclocked clock speed (Air) 4.38 GHz vs 2.87 GHz Around 55% better overclocked clock speed (Air)
More threads 8 vs 1 7 more threads
Significantly better PassMark score 5,061 vs 435 Around 11.8x better PassMark score
More cores 4 vs 1 3 more cores; run more applications at once
Newer Mar, 2009 vs Jun, 2004 Release date over 4 years later
Better geekbench 3 single core score 1,935 vs 1,415 More than 35% better geekbench 3 single core score
Much better overclocked clock speed (Water) 4.46 GHz vs 2.4 GHz More than 85% better overclocked clock speed (Water)
Better performance per watt 1.38 pt/W vs 0.49 pt/W More than 2.8x better performance per watt
Front view of AMD Athlon 3700+

Reasons to consider the
AMD Athlon 3700+

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Much lower typical power consumption 72.31W vs 105.63W More than 30% lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Much lower annual home energy cost 21.44 $/year vs 31.32 $/year More than 30% lower annual home energy cost
Much lower annual commercial energy cost 77.96 $/year vs 113.88 $/year More than 30% lower annual commercial energy cost

Benchmarks Real world tests of Xeon W3520 vs Athlon 3700+

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon W3520
7,257
Athlon 3700+
1,422

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon W3520
1,935
Athlon 3700+
1,415

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon W3520
117,600 MB/s
Athlon 3700+
192.7 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

Xeon W3520
9,166
Athlon 3700+
1,622

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon W3520  vs
Athlon 3700+ 
Clock speed 2.66 GHz 2.4 GHz
Cores Quad core Single core
Socket type
LGA 1366
754
939

features

Has a NX bit Yes Yes
Has virtualization support Yes No
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 130W 89W
Annual home energy cost 31.32 $/year 21.44 $/year
Annual commercial energy cost 113.88 $/year 77.96 $/year
Performance per watt 1.38 pt/W 0.49 pt/W
Typical power consumption 105.63W 72.31W

details

Xeon W3520  vs
Athlon 3700+ 
Architecture x86-64 x86-64
Threads 8 1
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 1 MB/core
L3 cache 8 MB 0 MB
L3 cache per core 2 MB/core 0 MB/core
Manufacture process 45 nm 130 nm
Max CPUs 1 1
Operating temperature Unknown - 67.9°C Unknown - 70°C

overclocking

Overclocked clock speed 4.38 GHz 2.87 GHz
Overclocked clock speed (Water) 4.46 GHz 2.4 GHz
Overclocked clock speed (Air) 4.38 GHz 2.87 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 W3520
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AMD Athlon 3700+
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