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Differences What are the advantages of each

Front view of Intel Xeon E5-2620

Reasons to consider the
Intel Xeon E5-2620

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Much more l3 cache 15 MB vs 6 MB 2.5x more l3 cache; more data can be stored in the l3 cache for quick access later
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
More cores 6 vs 4 2 more cores; run more applications at once
Much better performance per watt 6.57 pt/W vs 2.67 pt/W Around 2.5x better performance per watt
More threads 12 vs 4 Three times as many threads
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l3 cache per core 2.5 MB/core vs 1.5 MB/core More than 65% more l3 cache per core
Better overclocked clock speed (Air) 2.28 GHz vs 2.2 GHz Around 5% better overclocked clock speed (Air)
Newer Mar, 2012 vs Jan, 2009 Release date over 3 years later
Front view of AMD Opteron 8374 HE

Reasons to consider the
AMD Opteron 8374 HE

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Significantly higher clock speed 2.2 GHz vs 2 GHz More than 10% higher clock speed
Supports more CPUs in SMP configuration 8 vs 2 6 supports more CPUs in SMP configuration
Significantly lower typical power consumption 44.69W vs 77.19W More than 40% lower typical power consumption
Significantly more l2 cache per core 0.5 MB/core vs 0.33 MB/core More than 50% more l2 cache per core
Significantly lower annual commercial energy cost 48.18 $/year vs 83.22 $/year More than 40% lower annual commercial energy cost
Significantly lower annual home energy cost 13.25 $/year vs 22.89 $/year More than 40% lower annual home energy cost
Significantly better overclocked clock speed (Water) 2.2 GHz vs 2 GHz More than 10% better overclocked clock speed (Water)

Benchmarks Real world tests of Xeon E5-2620 vs Opteron 8374 HE

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5-2620
1,315,000 MB/s
Opteron 8374 HE
87,800 MB/s

Specifications Full list of technical specs

summary

Xeon E5-2620  vs
Opteron 8374 HE 
Clock speed 2 GHz 2.2 GHz
Cores Hexa core Quad core
Socket type
LGA 2011
F
Is unlocked Yes No

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
AVX
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 55W
Annual home energy cost 22.89 $/year 13.25 $/year
Annual commercial energy cost 83.22 $/year 48.18 $/year
Performance per watt 6.57 pt/W 2.67 pt/W
Typical power consumption 77.19W 44.69W

bus

Clock speed 3,600 MHz 2,000 MHz

details

Xeon E5-2620  vs
Opteron 8374 HE 
Threads 12 4
L2 cache 2 MB 2 MB
L2 cache per core 0.33 MB/core 0.5 MB/core
L3 cache 15 MB 6 MB
L3 cache per core 2.5 MB/core 1.5 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 8
Clock multiplier 25 11
Voltage range 0.6 - 1.35V 1 - UnknownV
Operating temperature Unknown - 77.4°C 0 - 55°C

overclocking

Overclocked clock speed 2.28 GHz 2.2 GHz
Overclocked clock speed (Water) 2 GHz 2.2 GHz
Overclocked clock speed (Air) 2.28 GHz 2.2 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
Intel Xeon E5-2620
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AMD Opteron 8374 HE
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