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Intel Xeon E5 2643 v2

Front view of Intel Xeon E5 2643 v2
Front view of Intel Xeon E5-2643

Intel Xeon E5-2643

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Differences What are the advantages of each

Front view of Intel Xeon E5 2643 v2

Reasons to consider the
Intel Xeon E5 2643 v2

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Much more l3 cache 25 MB vs 10 MB 2.5x more l3 cache; more data can be stored in the l3 cache for quick access later
Much more l2 cache 2.5 MB vs 1 MB 2.5x more l2 cache; more data can be stored in the l2 cache for quick access later
More threads 20 vs 8 12 more threads
Significantly higher clock speed 3.5 GHz vs 3.3 GHz More than 5% higher clock speed
More cores 6 vs 4 2 more cores; run more applications at once
Higher turbo clock speed 3.8 GHz vs 3.5 GHz Around 10% higher turbo clock speed
Supports more RAM 786,432 MB vs 393,216 MB Supports 2x more RAM
Much more l3 cache per core 4.17 MB/core vs 2.5 MB/core More than 65% more l3 cache per core
Newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly better overclocked clock speed (Air) 3.57 GHz vs 3.3 GHz Around 10% better overclocked clock speed (Air)
Significantly more l2 cache per core 0.42 MB/core vs 0.25 MB/core More than 65% more l2 cache per core
Much better overclocked clock speed (Water) 4.07 GHz vs 3.3 GHz Around 25% better overclocked clock speed (Water)
Front view of Intel Xeon E5-2643

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Intel Xeon E5-2643

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Much better performance per dollar 1.09 pt/$ vs 0.9 pt/$ More than 20% better performance per dollar

Benchmarks Real world tests of Xeon E5 2643 v2 vs E5-2643

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5 2643 v2
16,602
Xeon E5-2643
12,252

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon E5 2643 v2
2,757
Xeon E5-2643
2,764

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5 2643 v2
2,060,000 MB/s
Xeon E5-2643
2,195,000 MB/s

Specifications Full list of technical specs

summary

 Xeon E5 2643 v2  vs
E5-2643 
Clock speed 3.5 GHz 3.3 GHz
Turbo clock speed 3.8 GHz 3.5 GHz
Cores Hexa core Quad core
Socket type
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 130W 130W
Annual home energy cost 31.32 $/year 31.32 $/year
Annual commercial energy cost 113.88 $/year 113.88 $/year
Performance per watt 10.7 pt/W 7.41 pt/W
Typical power consumption 105.63W 105.63W

bus
Architecture QPI QPI
Number of links 2 2
Data rate 64,000 MB/s 64,000 MB/s
Transfer rate 8,000 MT/s 8,000 MT/s
Clock speed 4,000 MHz 4,000 MHz

details

 Xeon E5 2643 v2  vs
E5-2643 
Architecture x86-64 x86-64
Threads 20 8
L2 cache 2.5 MB 1 MB
L2 cache per core 0.42 MB/core 0.25 MB/core
L3 cache 25 MB 10 MB
L3 cache per core 4.17 MB/core 2.5 MB/core
Manufacture process 22 nm 32 nm
Max CPUs 2 2
Clock multiplier 35 35
Operating temperature Unknown - 74°C Unknown - 73°C

overclocking
Overclocked clock speed 3.57 GHz 3.3 GHz
Overclocked clock speed (Water) 4.07 GHz 3.3 GHz
Overclocked clock speed (Air) 3.57 GHz 3.3 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 Yes
Maximum bandwidth 25,600 MB/s 51,200 MB/s
Maximum memory size 786,432 MB 393,216 MB
Intel Xeon E5 2643 v2
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Intel Xeon E5-2643
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