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Differences What are the advantages of each

Front view of Intel Xeon X3440

Reasons to consider the
Intel Xeon X3440

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Much better overclocked clock speed (Air) 3.84 GHz vs 2.9 GHz More than 30% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.2 GHz vs 2.5 GHz Around 70% better overclocked clock speed (Water)
Front view of Intel Xeon E5-2640

Reasons to consider the
Intel Xeon E5-2640

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Much more l3 cache 15 MB vs 8 MB Around 90% more l3 cache; more data can be stored in the l3 cache for quick access later
Much 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
Much better PassMark score 15,348 vs 4,559 More than 3.2x better PassMark score
Much better PassMark (Single core) score 1,854 vs 1,036 Around 80% better PassMark (Single core) score
More cores 6 vs 4 2 more cores; run more applications at once
Much better performance per watt 7.66 pt/W vs 1.72 pt/W Around 4.5x better performance per watt
Supports more RAM 393,216 MB vs 32,768 MB Supports 12x more RAM
More threads 12 vs 8 4 more threads
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More l3 cache per core 2.5 MB/core vs 2 MB/core 25% more l3 cache per core
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Newer Mar, 2012 vs Sep, 2009 Release date over 2 years later

Benchmarks Real world tests of Xeon X3440 vs E5-2640

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon X3440
6,898
Xeon E5-2640
9,664

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon X3440
1,726
Xeon E5-2640
2,099

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon X3440
108,800 MB/s
Xeon E5-2640
1,400,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon X3440
6,463
Xeon E5-2640
16,730

GeekBench

Xeon X3440
9,536
Xeon E5-2640
16,730

PassMark Data courtesy Passmark

Xeon X3440
4,559
Xeon E5-2640
15,348

PassMark (Single Core)

Xeon X3440
1,036
Xeon E5-2640
1,854

Specifications Full list of technical specs

summary

Xeon X3440  vs
E5-2640 
Clock speed 2.53 GHz 2.5 GHz
Turbo clock speed 2.93 GHz 3 GHz
Cores Quad core Hexa core
Socket type
LGA 1156
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 95W 95W
Annual home energy cost 22.89 $/year 22.89 $/year
Annual commercial energy cost 83.22 $/year 83.22 $/year
Performance per watt 1.72 pt/W 7.66 pt/W
Typical power consumption 77.19W 77.19W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3-800
DDR3
Channels Dual Channel Quad Channel
Supports ECC Yes Yes
Maximum bandwidth 21,333.32 MB/s 42,666.64 MB/s
Maximum memory size 32,768 MB 393,216 MB

details

Xeon X3440  vs
E5-2640 
Architecture x86-64 x86-64
Threads 8 12
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 0.33 MB/core
L3 cache 8 MB 15 MB
L3 cache per core 2 MB/core 2.5 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 1 2
Clock multiplier 19 30
Voltage range 0.65 - 1.4V 0.6 - 1.35V
Operating temperature Unknown - 72.7°C Unknown - 73°C

overclocking

Overclock popularity 5 3
Overclocked clock speed 3.84 GHz 2.9 GHz
Overclocked clock speed (Water) 4.2 GHz 2.5 GHz
Overclocked clock speed (Air) 3.84 GHz 2.9 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

bus

Architecture DMI QPI
Number of links 1 2
Transfer rate 2,500 MT/s 7,200 MT/s
Intel Xeon X3440
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Intel Xeon E5-2640
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