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Intel Xeon E5-4640

Front view of Intel Xeon E5-4640
Front view of Intel Core i7 3820

Intel Core i7 3820

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Differences What are the advantages of each

Front view of Intel Xeon E5-4640

Reasons to consider the
Intel Xeon E5-4640

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Significantly 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
Significantly more l3 cache 20 MB vs 10 MB 2x more l3 cache; more data can be stored in the l3 cache for quick access later
Much lower typical power consumption 77.19W vs 139.6W Around 45% lower typical power consumption
Supports more CPUs in SMP configuration 4 vs 1 3 supports more CPUs in SMP configuration
More cores 8 vs 4 Twice as many cores; run more applications at once
More threads 16 vs 8 Twice as many threads
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Supports more RAM 393,216 MB vs 65,771.52 MB Supports around 6x more RAM
Much lower annual home energy cost 22.89 $/year vs 49.49 $/year 2.2x lower annual home energy cost
Better PassMark score 10,523 vs 8,998 More than 15% better PassMark score
Much lower annual commercial energy cost 83.22 $/year vs 138.93 $/year More than 40% lower annual commercial energy cost
Newer May, 2012 vs Feb, 2012 Release date 3 months later
Front view of Intel Core i7 3820

Reasons to consider the
Intel Core i7 3820

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Significantly higher clock speed 3.6 GHz vs 2.4 GHz More than 50% higher clock speed
Much better performance per dollar 4.08 pt/$ vs 0.17 pt/$ Around 23.5x better performance per dollar
Significantly higher turbo clock speed 3.8 GHz vs 2.8 GHz More than 35% higher turbo clock speed
Much better overclocked clock speed (Air) 4.68 GHz vs 2.63 GHz Around 80% better overclocked clock speed (Air)
Significantly better performance per watt 6.18 pt/W vs 1.83 pt/W More than 3.2x better performance per watt
Better PassMark (Single core) score 1,943 vs 1,423 More than 35% better PassMark (Single core) score
Much better overclocked clock speed (Water) 4.71 GHz vs 2.4 GHz More than 95% better overclocked clock speed (Water)

Benchmarks Real world tests of Xeon E5-4640 vs Core i7 3820

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5-4640
5,597.5
Core i7 3820
12,538

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon E5-4640
1,573
Core i7 3820
3,098

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5-4640
103.35 MB/s
Core i7 3820
2,500,000 MB/s

PassMark Data courtesy Passmark

Xeon E5-4640
10,523
Core i7 3820
8,998

PassMark (Single Core)

Xeon E5-4640
1,423
Core i7 3820
1,943

Specifications Full list of technical specs

summary

 Xeon E5-4640  vs
Core i7 3820 
Clock speed 2.4 GHz 3.6 GHz
Turbo clock speed 2.8 GHz 3.8 GHz
Cores Octa core Quad core
Socket type
LGA 2011

features
Has a NX bit Yes Yes
Supports trusted computing Yes No
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 95W 130W
Annual home energy cost 22.89 $/year 49.49 $/year
Annual commercial energy cost 83.22 $/year 138.93 $/year
Performance per watt 1.83 pt/W 6.18 pt/W
Typical power consumption 77.19W 139.6W

bus
Architecture QPI DMI 2.0
Number of links 2 1
Transfer rate 8,000 MT/s 5,000 MT/s

details

 Xeon E5-4640  vs
Core i7 3820 
Architecture x86-64 x86-64
Threads 16 8
L2 cache 2 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 20 MB 10 MB
L3 cache per core 2.5 MB/core 2.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 4 1
Voltage range 0.6 - 1.35V 0.6 - 1.35V

overclocking
Overclocked clock speed 2.63 GHz 4.68 GHz
Overclocked clock speed (Water) 2.4 GHz 4.71 GHz
Overclocked clock speed (Air) 2.63 GHz 4.68 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 Quad Channel Quad Channel
Supports ECC Yes No
Maximum bandwidth 51,200 MB/s 51,200 MB/s
Maximum memory size 393,216 MB 65,771.52 MB
Intel Xeon E5-4640
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Intel Core i7 3820
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