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Differences What are the advantages of each

Front view of AMD Phenom X4 9950

Reasons to consider the
AMD Phenom X4 9950

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Front view of AMD Athlon X2 6400+

Reasons to consider the
AMD Athlon X2 6400+

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CPUBoss is not aware of any important advantages of the Athlon X2 6400+ vs the Phenom X4 9950.

Benchmarks Real world tests of Phenom X4 9950 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

Phenom X4 9950
99,900 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

Phenom X4 9950  vs
Athlon X2 6400+ 
Clock speed 2.6 GHz 3.2 GHz
Cores Quad core Dual core
Socket type
AM2+
AM2
Is unlocked Yes No

features

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

power consumption

TDP 140W 125W
Annual home energy cost 33.73 $/year 30.11 $/year
Annual commercial energy cost 122.64 $/year 109.5 $/year
Performance per watt 0.88 pt/W 0.56 pt/W
Typical power consumption 113.75W 101.56W

details

Phenom X4 9950  vs
Athlon X2 6400+ 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 2 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
L3 cache 2 MB 0 MB
L3 cache per core 0.5 MB/core 0 MB/core
Manufacture process 65 nm 90 nm
Max CPUs 1 1
Operating temperature Unknown - 64°C Unknown - 55°C

overclocking

Overclocked clock speed 3.11 GHz 3.42 GHz
Overclocked clock speed (Water) 3.37 GHz 3.53 GHz
PassMark (Overclocked) 2,145.3 1,625.2
Overclocked clock speed (Air) 3.11 GHz 3.42 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A
AMD Phenom X4 9950
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AMD Athlon X2 6400+
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