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Intel Xeon E5645

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Front view of Intel Xeon E5645

Differences What are the advantages of each

Front view of Intel Xeon E5645

Reasons to consider the
Intel Xeon E5645

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Much better performance per watt 8.49 pt/W vs 1.83 pt/W Around 4.8x better performance per watt
Much better performance per dollar 1.2 pt/$ vs 0.17 pt/$ Around 7x better performance per dollar
Much better overclocked clock speed (Air) 3.39 GHz vs 2.63 GHz Around 30% better overclocked clock speed (Air)
Lower typical power consumption 65W vs 77.19W More than 15% lower typical power consumption
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Lower annual commercial energy cost 70.08 $/year vs 83.22 $/year More than 15% lower annual commercial energy cost
Lower annual home energy cost 19.27 $/year vs 22.89 $/year More than 15% lower annual home energy cost
Front view of Intel Xeon E5-4640

Reasons to consider the
Intel Xeon E5-4640

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Much more l3 cache 20 MB vs 12 MB More than 65% more l3 cache; more data can be stored in the l3 cache for quick access later
Much better PassMark (Single core) score 1,423 vs 1,083 More than 30% better PassMark (Single core) score
More threads 16 vs 12 4 more threads
Higher turbo clock speed 2.8 GHz vs 2.67 GHz Around 5% higher turbo clock speed
Supports more RAM 393,216 MB vs 294,912 MB Supports around 35% more RAM
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
More l3 cache per core 2.5 MB/core vs 2 MB/core 25% more l3 cache per core
Newer May, 2012 vs Mar, 2010 Release date over 2 years later

Benchmarks Real world tests of Xeon E5645 vs E5-4640

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5645
20,172
Xeon E5-4640
5,597.5

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon E5645
1,968
Xeon E5-4640
1,573

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5645
1,340,000 MB/s
Xeon E5-4640
103.35 MB/s

PassMark Data courtesy Passmark

Xeon E5645
6,545
Xeon E5-4640
10,523

PassMark (Single Core)

Xeon E5645
1,083
Xeon E5-4640
1,423

Specifications Full list of technical specs

summary

Xeon E5645  vs
E5-4640 
Clock speed 2.4 GHz 2.4 GHz
Turbo clock speed 2.67 GHz 2.8 GHz
Cores Hexa core Octa core
Socket type
LGA 1366
LGA 2011

features

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

power consumption

TDP 80W 95W
Annual home energy cost 19.27 $/year 22.89 $/year
Annual commercial energy cost 70.08 $/year 83.22 $/year
Performance per watt 8.49 pt/W 1.83 pt/W
Typical power consumption 65W 77.19W

bus

Architecture QPI QPI
Number of links 2 2
Data rate 46,928 MB/s 64,000 MB/s
Transfer rate 5,860 MT/s 8,000 MT/s
Clock speed 2,930 MHz 4,000 MHz

details

Xeon E5645  vs
E5-4640 
Architecture x86-64 x86-64
Threads 12 16
L2 cache 2 MB 2 MB
L2 cache per core 0.33 MB/core 0.25 MB/core
L3 cache 12 MB 20 MB
L3 cache per core 2 MB/core 2.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 4
Voltage range 0.75 - 1.35V 0.6 - 1.35V

overclocking

Overclocked clock speed 3.39 GHz 2.63 GHz
Overclocked clock speed (Water) 2.4 GHz 2.4 GHz
Overclocked clock speed (Air) 3.39 GHz 2.63 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

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Triple Channel Quad Channel
Supports ECC Yes Yes
Maximum bandwidth 31,999.98 MB/s 51,200 MB/s
Maximum memory size 294,912 MB 393,216 MB
Intel Xeon E5645
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Intel Xeon E5-4640
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