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Differences What are the advantages of each

Front view of Intel Pentium G645

Reasons to consider the
Intel Pentium G645

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 2.9 GHz vs 2.5 GHz More than 15% higher clock speed
Higher Maximum operating temperature 69.1 °C vs 55 °C More than 25% higher Maximum operating temperature
Newer Sep, 2012 vs Apr, 2009 Release date over 3 years later
Better overclocked clock speed (Air) 3 GHz vs 2.5 GHz Around 20% better overclocked clock speed (Air)
Better overclocked clock speed (Water) 3.09 GHz vs 2.5 GHz Around 25% better overclocked clock speed (Water)
Front view of AMD Opteron 8381 HE

Reasons to consider the
AMD Opteron 8381 HE

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Supports more CPUs in SMP configuration 8 vs 1 7 supports more CPUs in SMP configuration
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
More l3 cache 6 MB vs 3 MB 2x more l3 cache; more data can be stored in the l3 cache for quick access later
More cores 4 vs 2 Twice as many cores; run more applications at once
Lower typical power consumption 44.69W vs 52.81W More than 15% lower typical power consumption
More threads 4 vs 2 Twice as many threads
Lower annual home energy cost 13.25 $/year vs 15.66 $/year More than 15% lower annual home energy cost
Lower annual commercial energy cost 48.18 $/year vs 56.94 $/year More than 15% lower annual commercial energy cost

Features Key features of the Pentium G645  vs Opteron 8381 HE 

clock speed

Pentium G645
2.9 GHz
Opteron 8381 HE
2.5 GHz

L2 cache

L3 cache

overclocked clock speed (air)

overclocked clock speed (water)

Pentium G645
3.09 GHz
Opteron 8381 HE
2.5 GHz

Specifications Full list of technical specs

summary

Pentium G645  vs
Opteron 8381 HE 
Clock speed 2.9 GHz 2.5 GHz
Cores Dual core Quad core
Socket type
LGA 1155
F

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 65W 55W
Annual home energy cost 15.66 $/year 13.25 $/year
Annual commercial energy cost 56.94 $/year 48.18 $/year
Typical power consumption 52.81W 44.69W

details

Pentium G645  vs
Opteron 8381 HE 
Threads 2 4
L2 cache 1 MB 2 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
L3 cache 3 MB 6 MB
L3 cache per core 1.5 MB/core 1.5 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 1 8
Clock multiplier 29 12
Operating temperature Unknown - 69.1°C 0 - 55°C

overclocking

Overclocked clock speed 3 GHz 2.5 GHz
Overclocked clock speed (Water) 3.09 GHz 2.5 GHz
Overclocked clock speed (Air) 3 GHz 2.5 GHz

integrated graphics

GPU GPU None
Label Intel® HD Graphics N/A
Number of displays supported 2 N/A
GPU clock speed 850 MHz N/A
Turbo clock speed 1,100 MHz N/A

bus

Architecture DMI HyperTransport 3.0
Intel Pentium G645
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AMD Opteron 8381 HE
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