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Differences What are the advantages of each

Front view of Intel Core i5 650

Reasons to consider the
Intel Core i5 650

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Much more l3 cache 4 MB vs 0 MB Compared to all cpus, 4 MB l3 cache is just OK
Much newer manufacturing process 32 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
More threads 4 vs 2 Twice as many threads
Much better performance per watt 4.67 pt/W vs 0.56 pt/W More than 8.2x better performance per watt
Much more l3 cache per core 2 MB/core vs 0 MB/core Compared to all cpus, 2 MB/core l3 cache per core is just OK
Much higher Maximum operating temperature 72.6 °C vs 55 °C More than 30% higher Maximum operating temperature
Much better overclocked clock speed (Air) 4.31 GHz vs 3.42 GHz More than 25% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 5.08 GHz vs 3.53 GHz Around 45% better overclocked clock speed (Water)
Lower annual commercial energy cost 96.89 $/year vs 109.5 $/year More than 10% lower annual commercial energy cost
Front view of AMD Athlon X2 6400+

Reasons to consider the
AMD Athlon X2 6400+

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Much 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 more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much lower annual home energy cost 30.11 $/year vs 37.54 $/year Around 20% lower annual home energy cost

Benchmarks Real world tests of Core i5 650 vs Athlon X2 6400+

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

Core i5 650
1,550,000 MB/s
Athlon X2 6400+
87.5 MB/s

3D Mark 11 (Physics)

Cinebench R10 32-Bit

sysmark 2007 (overall)

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i5 650  vs
Athlon X2 6400+ 
Clock speed 3.2 GHz 3.2 GHz
Cores Dual core Dual core
Socket type
LGA 1156
AM2
Is unlocked No No

features

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

power consumption

TDP 73W 125W
Annual home energy cost 37.54 $/year 30.11 $/year
Annual commercial energy cost 96.89 $/year 109.5 $/year
Performance per watt 4.67 pt/W 0.56 pt/W
Typical power consumption 100.22W 101.56W

details

Core i5 650  vs
Athlon X2 6400+ 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 1 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
L3 cache 4 MB 0 MB
L3 cache per core 2 MB/core 0 MB/core
Manufacture process 32 nm 90 nm
Max CPUs 1 1
Voltage range 0.65 - 1.4V 1.35 - 1.4V
Operating temperature Unknown - 72.6°C Unknown - 55°C

overclocking

Overclocked clock speed 4.31 GHz 3.42 GHz
Overclocked clock speed (Water) 5.08 GHz 3.53 GHz
Overclocked clock speed (Air) 4.31 GHz 3.42 GHz

integrated graphics

GPU GPU None
Label Intel® HD Graphics N/A
Number of displays supported 2 N/A
GPU clock speed 733 MHz N/A
Intel Core i5 650
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AMD Athlon X2 6400+
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