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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 higher clock speed 3.06 GHz vs 2.2 GHz Around 40% higher clock speed
Much higher turbo clock speed 3.46 GHz vs 2.6 GHz Around 35% higher turbo clock speed
Much better PassMark (Single core) score 1,405 vs 1,232 Around 15% better PassMark (Single core) score
Much better overclocked clock speed (Air) 4.29 GHz vs 2.32 GHz Around 85% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.77 GHz vs 2.2 GHz Around 2.2x 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
Front view of Intel Xeon E5-4620

Reasons to consider the
Intel Xeon E5-4620

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Much more l3 cache 16 MB vs 12 MB Around 35% more l3 cache; more data can be stored in the l3 cache for quick access later
More threads 16 vs 12 4 more threads
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
Newer May, 2012 vs Feb, 2011 Release date over 1 years later

Benchmarks Real world tests of Xeon X5675 vs E5-4620

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon X5675
25,323
Xeon E5-4620
61,522

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon X5675
2,418
Xeon E5-4620
2,608

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon X5675
1,650,000 MB/s
Xeon E5-4620
1,830 MB/s

PassMark Data courtesy Passmark

Xeon X5675
8,527
Xeon E5-4620
8,127

PassMark (Single Core)

Xeon X5675
1,405
Xeon E5-4620
1,232

Specifications Full list of technical specs

summary

Xeon X5675  vs
E5-4620 
Clock speed 3.06 GHz 2.2 GHz
Turbo clock speed 3.46 GHz 2.6 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 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 8.89 pt/W 5.25 pt/W
Typical power consumption 77.19W 77.19W

bus

Architecture QPI QPI
Number of links 2 2
Data rate 51,200 MB/s 57,600 MB/s
Transfer rate 6,400 MT/s 7,200 MT/s
Clock speed 3,200 MHz 3,600 MHz

details

Xeon X5675  vs
E5-4620 
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 16 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 4
Voltage range 0.75 - 1.35V 0.6 - 1.35V

overclocking

Overclock popularity 2 0
Overclocked clock speed 4.29 GHz 2.32 GHz
Overclocked clock speed (Water) 4.77 GHz 2.2 GHz
Overclocked clock speed (Air) 4.29 GHz 2.32 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
DDR3-1333
DDR3-1066
DDR3-800
DDR3
Channels Triple Channel Quad Channel
Supports ECC Yes Yes
Maximum bandwidth 31,999.98 MB/s 42,666.64 MB/s
Maximum memory size 294,912 MB 393,216 MB
Intel Xeon X5675
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Intel Xeon E5-4620
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