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Differences What are the advantages of each

Front view of Intel Xeon E3-1265L v2

Reasons to consider the
Intel Xeon E3-1265L v2

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Much more l3 cache 8 MB vs 3 MB Around 2.8x more l3 cache; more data can be stored in the l3 cache for quick access later
Much better PassMark score 7,745 vs 4,427 Around 75% better PassMark score
Significantly higher clock speed 2.5 GHz vs 2.3 GHz Around 10% higher clock speed
More cores 4 vs 2 Twice as many cores; run more applications at once
Much better performance per dollar 2.8 pt/$ vs 0.78 pt/$ More than 3.5x better performance per dollar
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
More threads 8 vs 4 Twice as many threads
Much better overclocked clock speed (Air) 2.5 GHz vs 1.8 GHz Around 40% better overclocked clock speed (Air)
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Much better overclocked clock speed (Water) 2.5 GHz vs 1.8 GHz Around 40% better overclocked clock speed (Water)
Front view of Intel Xeon E3-1220LV2

Reasons to consider the
Intel Xeon E3-1220LV2

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Significantly lower typical power consumption 13.81W vs 36.56W 2.6x lower typical power consumption
Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Significantly lower annual commercial energy cost 14.89 $/year vs 39.42 $/year 2.6x lower annual commercial energy cost
Significantly lower annual home energy cost 4.1 $/year vs 10.84 $/year 2.6x lower annual home energy cost

Benchmarks Real world tests of Xeon E3-1265L v2 vs E3-1220LV2

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 E3-1265L v2
2,050,000 MB/s
Xeon E3-1220LV2
182.8 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon E3-1265L v2  vs
E3-1220LV2 
Clock speed 2.5 GHz 2.3 GHz
Turbo clock speed 3.5 GHz 3.5 GHz
Cores Quad core Dual core
Socket type
LGA 1155

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 45W 17W
Annual home energy cost 10.84 $/year 4.1 $/year
Annual commercial energy cost 39.42 $/year 14.89 $/year
Performance per watt 19.91 pt/W 8.68 pt/W
Typical power consumption 36.56W 13.81W

bus

Architecture DMI DMI
Number of links 1 1
Transfer rate 5,000 MT/s 5,000 MT/s

details

Xeon E3-1265L v2  vs
E3-1220LV2 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 8 MB 3 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 22 nm 22 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.5 GHz 1.8 GHz
Overclocked clock speed (Water) 2.5 GHz 1.8 GHz
Overclocked clock speed (Air) 2.5 GHz 1.8 GHz

integrated graphics

GPU GPU None
Label Intel® HD Graphics 2500 N/A
Number of displays supported 3 N/A
GPU clock speed 650 MHz N/A
Turbo clock speed 1,150 MHz N/A

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Supports ECC Yes Yes
Maximum bandwidth 25,600 MB/s 25,600 MB/s
Maximum memory size 33,556.48 MB 33,003.52 MB
Intel Xeon E3-1265L v2
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Intel Xeon E3-1220LV2
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