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Differences What are the advantages of each

Front view of Intel Xeon E3-1275 v5

Reasons to consider the
Intel Xeon E3-1275 v5

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Significantly newer manufacturing process 14 nm vs 22 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher GPU clock speed 400 MHz vs 350 MHz Around 15% higher GPU clock speed
Better geekbench 3 Multi-Core score 14,383 vs 13,608 More than 5% better geekbench 3 Multi-Core score
Newer Oct, 2015 vs Apr, 2014 Release date over 1 years later
Better overclocked clock speed (Air) 4 GHz vs 3.78 GHz More than 5% better overclocked clock speed (Air)
Better overclocked clock speed (Water) 4 GHz vs 3.7 GHz Around 10% better overclocked clock speed (Water)
Front view of Intel Xeon E3-1246 v3

Reasons to consider the
Intel Xeon E3-1246 v3

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Much better performance per dollar 4.47 pt/$ vs 0.8 pt/$ More than 5.5x better performance per dollar
Much better performance per watt 15.17 pt/W vs 3.54 pt/W More than 4.2x better performance per watt
Better turbo clock speed 1,200 MHz vs 1,150 MHz Around 5% better turbo clock speed

Benchmarks Real world tests of Xeon E3-1275 v5 vs E3-1246 v3

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 E3-1275 v5
5,405 MB/s
Xeon E3-1246 v3
4,510,000 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon E3-1275 v5  vs
E3-1246 v3 
Clock speed 3.6 GHz 3.5 GHz
Turbo clock speed 4 GHz 3.9 GHz
Cores Quad core Quad core

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
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 80W 84W
Annual home energy cost 19.27 $/year 20.24 $/year
Annual commercial energy cost 70.08 $/year 73.58 $/year
Performance per watt 3.54 pt/W 15.17 pt/W
Typical power consumption 65W 68.25W

bus

Architecture FSB DMI 2.0
Number of links 1 0
Transfer rate 8,000 MT/s 5,000 MT/s

details

Xeon E3-1275 v5  vs
E3-1246 v3 
Architecture x86-64 x86-64
Threads 8 8
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 14 nm 22 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4 GHz 3.78 GHz
Overclocked clock speed (Water) 4 GHz 3.7 GHz
Overclocked clock speed (Air) 4 GHz 3.78 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics P530 Intel® HD Graphics P4600
Number of displays supported 3 3
GPU clock speed 400 MHz 350 MHz
Turbo clock speed 1,150 MHz 1,200 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3L-1600
DDR3-1600
DDR3-1333
DDR3
Channels Dual Channel Dual Channel
Supports ECC Yes Yes
Maximum bandwidth 25,600 MB/s 25,600 MB/s
Maximum memory size 65,536 MB 32,768 MB
Intel Xeon E3-1275 v5
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Intel Xeon E3-1246 v3
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