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Differences What are the advantages of each

Front view of Intel Xeon E5645

Reasons to consider the
Intel Xeon E5645

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Higher clock speed 2.4 GHz vs 2 GHz Around 20% higher clock speed
Much better overclocked clock speed (Air) 3.39 GHz vs 1.6 GHz More than 2x better overclocked clock speed (Air)
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
More threads 12 vs 4 Three times as many threads
Much better performance per watt 8.49 pt/W vs 3.24 pt/W More than 2.5x better performance per watt
Significantly better PassMark score 6,545 vs 1,954 More than 3.2x better PassMark score
More cores 6 vs 4 2 more cores; run more applications at once
Better PassMark (Single core) score 1,083 vs 732 Around 50% better PassMark (Single core) score
Better overclocked clock speed (Water) 2.4 GHz vs 1.6 GHz Around 50% better overclocked clock speed (Water)
Front view of AMD R R-460L

Reasons to consider the
AMD R R-460L

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Much more l2 cache 4 MB vs 2 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower typical power consumption 20.31W vs 65W 3.2x lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.33 MB/core More than 3x more l2 cache per core
Significantly higher Maximum operating temperature 100 °C vs 76.2 °C More than 30% higher Maximum operating temperature
Newer May, 2012 vs Mar, 2010 Release date over 2 years later
Much lower annual home energy cost 6.02 $/year vs 19.27 $/year 3.2x lower annual home energy cost
Much lower annual commercial energy cost 21.9 $/year vs 70.08 $/year 3.2x lower annual commercial energy cost

Benchmarks Real world tests of Xeon E5645 vs R R-460L

PassMark Data courtesy Passmark

Xeon E5645
6,545
R R-460L
1,954

PassMark (Single Core)

Xeon E5645
1,083
R R-460L
732

Specifications Full list of technical specs

summary

Xeon E5645  vs
R R-460L 
Clock speed 2.4 GHz 2 GHz
Turbo clock speed 2.67 GHz 2.8 GHz
Cores Hexa core Quad core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
F16C
MMX
SSE4
XOP
AVX
SSE3
SSE
BMI1
AMD64
SSE4.1
FMA4
FMA3
SSE4.2
AMD-V
Supplemental SSE3
AES
TBM
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 80W 25W
Annual home energy cost 19.27 $/year 6.02 $/year
Annual commercial energy cost 70.08 $/year 21.9 $/year
Performance per watt 8.49 pt/W 3.24 pt/W
Typical power consumption 65W 20.31W

details

Xeon E5645  vs
R R-460L 
Threads 12 4
L2 cache 2 MB 4 MB
L2 cache per core 0.33 MB/core 1 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 1
Clock multiplier 18 10
Voltage range 0.75 - 1.35V 0.85 - 1.2V
Operating temperature Unknown - 76.2°C Unknown - 100°C

overclocking

Overclocked clock speed 3.39 GHz 1.6 GHz
Overclocked clock speed (Water) 2.4 GHz 1.6 GHz
Overclocked clock speed (Air) 3.39 GHz 1.6 GHz

integrated graphics

GPU None GPU
Label N/A AMD Radeon HD 7620G
GPU clock speed N/A 360 MHz
Turbo clock speed N/A 497 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3-800
DDR3
Channels Triple Channel Dual Channel
Maximum bandwidth 31,999.98 MB/s 21,333.32 MB/s
Intel Xeon E5645
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AMD R R-460L
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