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Differences What are the advantages of each

Front view of Intel Xeon E3-1275

Reasons to consider the
Intel Xeon E3-1275

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Much better turbo clock speed 1,350 MHz vs 1,100 MHz Around 25% better turbo clock speed
Much lower typical power consumption 77.19W vs 112.55W More than 30% lower typical power consumption
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Slightly more l3 cache 8 MB vs 6 MB Around 35% more l3 cache; more data can be stored in the l3 cache for quick access later
Better PassMark score 9,863 vs 6,383 Around 55% better PassMark score
More threads 8 vs 4 Twice as many threads
Better PassMark (Single core) score 2,191 vs 1,863 Around 20% better PassMark (Single core) score
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Much lower annual home energy cost 22.89 $/year vs 41.29 $/year Around 45% lower annual home energy cost
Significantly lower annual commercial energy cost 83.22 $/year vs 110.03 $/year Around 25% lower annual commercial energy cost
Newer Apr, 2011 vs Jan, 2011 Release date 3 months later
Front view of Intel Core i5 2500K

Reasons to consider the
Intel Core i5 2500K

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Much better performance per dollar 4.1 pt/$ vs 0.69 pt/$ Around 6x better performance per dollar
Significantly better performance per watt 6.79 pt/W vs 2.53 pt/W Around 2.8x better performance per watt
Significantly better overclocked clock speed (Air) 4.98 GHz vs 3.88 GHz Around 30% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.88 GHz vs 3.5 GHz Around 40% better overclocked clock speed (Water)

Benchmarks Real world tests of Xeon E3-1275 vs Core i5 2500K

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon E3-1275
3,271.5

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E3-1275
2,370 MB/s
Core i5 2500K
2,530,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon E3-1275
12,963
Core i5 2500K
10,319

GeekBench (64-bit) Data courtesy Primate Labs

Xeon E3-1275
14,039
Core i5 2500K
11,186

GeekBench

Xeon E3-1275
14,039
Core i5 2500K
13,624

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon E3-1275  vs
Core i5 2500K 
Clock speed 3.4 GHz 3.3 GHz
Turbo clock speed 3.8 GHz 3.7 GHz
Cores Quad core Quad core
Socket type
LGA 1155

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
EM64T
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 41.29 $/year
Annual commercial energy cost 83.22 $/year 110.03 $/year
Performance per watt 2.53 pt/W 6.79 pt/W
Typical power consumption 77.19W 112.55W

bus

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

details

Xeon E3-1275  vs
Core i5 2500K 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 6 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 1 1
Clock multiplier 34 33
Operating temperature Unknown - 72.6°C 5 - 72.6°C

overclocking

Overclock popularity 0 3,179
Overclocked clock speed 3.88 GHz 4.98 GHz
Overclocked clock speed (Water) 3.5 GHz 4.88 GHz
Overclocked clock speed (Air) 3.88 GHz 4.98 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics P3000 Intel® HD Graphics 3000
Number of displays supported 2 2
GPU clock speed 850 MHz 850 MHz
Turbo clock speed 1,350 MHz 1,100 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Supports ECC Yes No
Maximum bandwidth 21,333.32 MB/s 21,333.32 MB/s
Maximum memory size 32,768 MB 32,768 MB
Intel Xeon E3-1275
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Intel Core i5 2500K
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