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Differences What are the advantages of each

Front view of Intel Xeon E5-2620 v3

Reasons to consider the
Intel Xeon E5-2620 v3

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Significantly higher turbo clock speed 3.2 GHz vs 2.8 GHz Around 15% higher turbo clock speed
Higher clock speed 2.4 GHz vs 2.3 GHz Around 5% higher clock speed
Newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Lower typical power consumption 69.06W vs 80.44W Around 15% lower typical power consumption
Lower annual commercial energy cost 74.46 $/year vs 86.72 $/year Around 15% lower annual commercial energy cost
Lower annual home energy cost 20.48 $/year vs 23.85 $/year Around 15% lower annual home energy cost
Better overclocked clock speed (Water) 2.87 GHz vs 2.8 GHz Almost the same
Front view of AMD Opteron 6338P

Reasons to consider the
AMD Opteron 6338P

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More l3 cache 16 MB vs 15 MB More than 5% more l3 cache; more data can be stored in the l3 cache for quick access later
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
Better overclocked clock speed (Air) 2.8 GHz vs 2.66 GHz More than 5% better overclocked clock speed (Air)

Features Key features of the Xeon E5-2620 v3  vs Opteron 6338P 

clock speed

Xeon E5-2620 v3
2.4 GHz
Opteron 6338P
2.3 GHz

turbo clock speed

Xeon E5-2620 v3
3.2 GHz
Opteron 6338P
2.8 GHz

L3 cache

overclocked clock speed (air)

Xeon E5-2620 v3
2.66 GHz
Opteron 6338P
2.8 GHz

overclocked clock speed (water)

Xeon E5-2620 v3
2.87 GHz
Opteron 6338P
2.8 GHz

Specifications Full list of technical specs

summary

Xeon E5-2620 v3  vs
Opteron 6338P 
Clock speed 2.4 GHz 2.3 GHz
Turbo clock speed 3.2 GHz 2.8 GHz
Cores Hexa core Dodeca core
Is unlocked Yes No

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
AVX 1.1
SSE2
F16C
MMX
XOP
AVX
SSE3
SSE
ABM
BMI1
CLMUL
AMD64
SSE4.1
FMA4
FMA3
SSE4.2
CVT16
AMD-V
Supplemental SSE3
AES
TBM
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 85W 99W
Annual home energy cost 20.48 $/year 23.85 $/year
Annual commercial energy cost 74.46 $/year 86.72 $/year
Typical power consumption 69.06W 80.44W

bus

Transfer rate 8,000 MT/s 6,400 MT/s
Clock speed 4,000 MHz 3,200 MHz

details

Xeon E5-2620 v3  vs
Opteron 6338P 
Architecture x86-64 x86-64
Threads 12 12
L3 cache 15 MB 16 MB
Manufacture process 22 nm 32 nm
Max CPUs 2 4
Operating temperature Unknown - 72.6°C Unknown - 69°C

overclocking

Overclocked clock speed 2.66 GHz 2.8 GHz
Overclocked clock speed (Water) 2.87 GHz 2.8 GHz
Overclocked clock speed (Air) 2.66 GHz 2.8 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
DDR
Channels Quad Channel Quad Channel
Supports ECC Yes Yes
Maximum bandwidth 6,400 MB/s 51,200 MB/s
Intel Xeon E5-2620 v3
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AMD Opteron 6338P
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