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Differences What are the advantages of each

Front view of Intel Xeon E3-1281 v3

Reasons to consider the
Intel Xeon E3-1281 v3

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Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Lower typical power consumption 66.63W vs 71.5W More than 5% lower typical power consumption
Lower annual home energy cost 19.75 $/year vs 21.2 $/year More than 5% lower annual home energy cost
Lower annual commercial energy cost 71.83 $/year vs 77.09 $/year More than 5% lower annual commercial energy cost
Front view of Intel Core i7 4790K

Reasons to consider the
Intel Core i7 4790K

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Higher turbo clock speed 4.4 GHz vs 3.9 GHz Around 15% higher turbo clock speed
Higher clock speed 4 GHz vs 3.7 GHz Around 10% higher clock speed
Much better performance per watt 11.42 pt/W vs 4.14 pt/W More than 2.8x better performance per watt
Better PassMark (Single core) score 2,530 vs 2,323 Around 10% better PassMark (Single core) score
Slightly better PassMark score 11,194 vs 10,234 Around 10% better PassMark score

Benchmarks Real world tests of Xeon E3-1281 v3 vs Core i7 4790K

GeekBench (32-bit) Data courtesy Primate Labs


PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs


Xeon E3-1281 v3  vs
Core i7 4790K 
Clock speed 3.7 GHz 4 GHz
Turbo clock speed 3.9 GHz 4.4 GHz
Cores Quad core Quad core
Is unlocked No Yes


Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes Yes
Instruction set extensions
Supplemental SSE3
AVX 2.0
Supports dynamic frequency scaling Yes Yes

memory controller

Memory controller Built-in Built-in
Memory type
Channels Dual Channel Dual Channel
Supports ECC Yes No
Maximum bandwidth 25,600 MB/s 25,600 MB/s


Xeon E3-1281 v3  vs
Core i7 4790K 
Architecture x86-64 x86-64
Threads 8 8
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 22 nm 22 nm
Max CPUs 1 1

integrated graphics

Label N/A Intel® HD Graphics 4600
Number of displays supported N/A 3
GPU clock speed N/A 350 MHz
Turbo clock speed N/A 1,250 MHz

power consumption

TDP 82W 88W
Annual home energy cost 19.75 $/year 21.2 $/year
Annual commercial energy cost 71.83 $/year 77.09 $/year
Performance per watt 4.14 pt/W 11.42 pt/W
Typical power consumption 66.63W 71.5W


Architecture DMI DMI 2.0
Number of links 0 0
Transfer rate 5,000 MT/s 5,000 MT/s
Intel Xeon E3-1281 v3
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Intel Core i7 4790K
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