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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 newer manufacturing process 32 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 3.4 GHz vs 1.3 GHz More than 2.5x higher clock speed
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Much better overclocked clock speed (Air) 3.88 GHz vs 1.3 GHz Around 3x better overclocked clock speed (Air)
More threads 8 vs 1 7 more threads
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
More cores 4 vs 1 3 more cores; run more applications at once
Much better overclocked clock speed (Water) 3.5 GHz vs 1.3 GHz Around 2.8x better overclocked clock speed (Water)
Front view of Intel Pentium 773

Reasons to consider the
Intel Pentium 773

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Significantly more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much lower typical power consumption 4.47W vs 77.19W 17.3x lower typical power consumption
Much more l2 cache per core 2 MB/core vs 0.25 MB/core 8x more l2 cache per core
Much lower annual home energy cost 1.32 $/year vs 22.89 $/year 17.3x lower annual home energy cost
Much lower annual commercial energy cost 4.82 $/year vs 83.22 $/year 17.3x lower annual commercial energy cost

Features Key features of the Xeon E3-1275  vs Pentium 773 

clock speed

Xeon E3-1275
3.4 GHz
Pentium 773
1.3 GHz

L2 cache

overclocked clock speed (air)

Xeon E3-1275
3.88 GHz
Pentium 773
1.3 GHz

overclocked clock speed (water)

Xeon E3-1275
3.5 GHz
Pentium 773
1.3 GHz

TDP

Specifications Full list of technical specs

summary

Xeon E3-1275  vs
Pentium 773 
Clock speed 3.4 GHz 1.3 GHz
Cores Quad core Single core
Socket type
LGA 1155
479

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes No
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 95W 5.5W
Annual home energy cost 22.89 $/year 1.32 $/year
Annual commercial energy cost 83.22 $/year 4.82 $/year
Typical power consumption 77.19W 4.47W

bus

Architecture DMI FSB
Number of links 1 1

details

Xeon E3-1275  vs
Pentium 773 
Architecture x86-64 x86
Threads 8 1
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 2 MB/core
Manufacture process 32 nm 90 nm
Max CPUs 1 1
Clock multiplier 34 13

overclocking

Overclocked clock speed 3.88 GHz 1.3 GHz
Overclocked clock speed (Water) 3.5 GHz 1.3 GHz
Overclocked clock speed (Air) 3.88 GHz 1.3 GHz

integrated graphics

GPU GPU None
Label Intel® HD Graphics P3000 N/A
Number of displays supported 2 N/A
GPU clock speed 850 MHz N/A
Turbo clock speed 1,350 MHz N/A

memory controller

Memory controller Built-in Built-in
Supports ECC Yes No
Intel Xeon E3-1275
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Intel Pentium 773
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