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Differences What are the advantages of each

Front view of Intel Xeon X5675

Reasons to consider the
Intel Xeon X5675

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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
More cores 6 vs 4 2 more cores; run more applications at once
Much higher Maximum operating temperature 81.3 °C vs 73 °C More than 10% higher Maximum operating temperature
More l3 cache 12 MB vs 10 MB 20% more l3 cache; more data can be stored in the l3 cache for quick access later
Much better overclocked clock speed (Air) 4.29 GHz vs 3.3 GHz Around 30% better overclocked clock speed (Air)
More threads 12 vs 8 4 more threads
Significantly lower typical power consumption 77.19W vs 105.63W More than 25% lower typical power consumption
Much better overclocked clock speed (Water) 4.77 GHz vs 3.3 GHz Around 45% better overclocked clock speed (Water)
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Significantly lower annual commercial energy cost 83.22 $/year vs 113.88 $/year More than 25% lower annual commercial energy cost
Significantly lower annual home energy cost 22.89 $/year vs 31.32 $/year More than 25% lower annual home energy cost
Front view of Intel Xeon E5-2643

Reasons to consider the
Intel Xeon E5-2643

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Significantly higher clock speed 3.3 GHz vs 3.06 GHz Around 10% higher clock speed
Much better performance per dollar 1.09 pt/$ vs 0.6 pt/$ Around 85% better performance per dollar
Supports more RAM 393,216 MB vs 294,912 MB Supports around 35% more RAM
More l3 cache per core 2.5 MB/core vs 2 MB/core 25% more l3 cache per core
Newer Mar, 2012 vs Feb, 2011 Release date over 1 years later

Benchmarks Real world tests of Xeon X5675 vs E5-2643

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon X5675
25,323
Xeon E5-2643
12,252

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon X5675
2,418
Xeon E5-2643
2,764

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon X5675
1,650,000 MB/s
Xeon E5-2643
2,195,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon X5675
13,025
Xeon E5-2643
16,367

GeekBench

Xeon X5675
13,025
Xeon E5-2643
16,367

PassMark Data courtesy Passmark

Xeon X5675
8,527
Xeon E5-2643
8,479

PassMark (Single Core)

Xeon X5675
1,405
Xeon E5-2643
1,793

Specifications Full list of technical specs

summary

Xeon X5675  vs
E5-2643 
Clock speed 3.06 GHz 3.3 GHz
Turbo clock speed 3.46 GHz 3.5 GHz
Cores Hexa core Quad 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 95W 130W
Annual home energy cost 22.89 $/year 31.32 $/year
Annual commercial energy cost 83.22 $/year 113.88 $/year
Performance per watt 8.89 pt/W 7.41 pt/W
Typical power consumption 77.19W 105.63W

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

details

Xeon X5675  vs
E5-2643 
Architecture x86-64 x86-64
Threads 12 8
L2 cache 2 MB 1 MB
L2 cache per core 0.33 MB/core 0.25 MB/core
L3 cache 12 MB 10 MB
L3 cache per core 2 MB/core 2.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 2
Clock multiplier 23 35
Voltage range 0.75 - 1.35V 0.6 - 1.35V
Operating temperature Unknown - 81.3°C Unknown - 73°C

overclocking

Overclocked clock speed 4.29 GHz 3.3 GHz
Overclocked clock speed (Water) 4.77 GHz 3.3 GHz
Overclocked clock speed (Air) 4.29 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

bus

Architecture QPI QPI
Number of links 2 2
Data rate 51,200 MB/s 64,000 MB/s
Transfer rate 6,400 MT/s 8,000 MT/s
Clock speed 3,200 MHz 4,000 MHz
Intel Xeon X5675
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Intel Xeon E5-2643
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