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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 180 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 2.66 GHz vs 1.13 GHz More than 2.2x higher clock speed
Significantly more l2 cache 1 MB vs 0.25 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much better overclocked clock speed (Air) 4.38 GHz vs 1.39 GHz Around 3.2x better overclocked clock speed (Air)
More threads 8 vs 1 7 more threads
More cores 4 vs 1 3 more cores; run more applications at once
Much better overclocked clock speed (Water) 4.46 GHz vs 1.13 GHz Around 4x better overclocked clock speed (Water)
Front view of AMD Athlon 1133

Reasons to consider the
AMD Athlon 1133

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CPUBoss is not aware of any important advantages of the AMD Athlon 1133 vs the Intel Xeon W3520.

Features Key features of the Xeon W3520  vs Athlon 1133 

clock speed

Xeon W3520
2.66 GHz
Athlon 1133
1.13 GHz

L2 cache

Xeon W3520
1 MB
Athlon 1133
0.25 MB

overclocked clock speed (air)

Xeon W3520
4.38 GHz
Athlon 1133
1.39 GHz

overclocked clock speed (water)

Xeon W3520
4.46 GHz
Athlon 1133
1.13 GHz

Specifications Full list of technical specs

summary

Xeon W3520  vs
Athlon 1133 
Clock speed 2.66 GHz 1.13 GHz
Cores Quad core Single core
Socket type
LGA 1366
462

features

Has a NX bit Yes No
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3

bus

Clock speed 2,400 MHz 266 MHz

details

Xeon W3520  vs
Athlon 1133 
Threads 8 1
L2 cache 1 MB 0.25 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
Manufacture process 45 nm 180 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.38 GHz 1.39 GHz
Overclocked clock speed (Water) 4.46 GHz 1.13 GHz
Overclocked clock speed (Air) 4.38 GHz 1.39 GHz

power consumption

Typical power consumption 105.63W N/A
Intel Xeon W3520
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AMD Athlon 1133
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