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Differences What are the advantages of each

Front view of AMD Phenom II X4 940

Reasons to consider the
AMD Phenom II X4 940

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Much more l3 cache 6 MB vs 0 MB Compared to all cpus, 6 MB l3 cache is just OK
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 higher clock speed 3 GHz vs 2.1 GHz Around 45% higher clock speed
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much better PassMark score 3,614 vs 1,041 Around 3.5x better PassMark score
Much better PassMark (Single core) score 1,026 vs 631 Around 65% better PassMark (Single core) score
Much better geekbench 2 (32-bit) score 5,246 vs 1,515 Around 3.5x better geekbench 2 (32-bit) score
Much newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much better performance per watt 1.19 pt/W vs 0.73 pt/W Around 65% better performance per watt
Much more l3 cache per core 1.5 MB/core vs 0 MB/core Compared to all cpus, 1.5 MB/core l3 cache per core is just OK
Much better overclocked clock speed (Air) 3.72 GHz vs 2.77 GHz Around 35% better overclocked clock speed (Air)
Much higher Maximum operating temperature 62 °C vs 55 °C Around 15% higher Maximum operating temperature
Significantly better overclocked clock speed (Water) 3.83 GHz vs 3.24 GHz Around 20% better overclocked clock speed (Water)
Newer Jan, 2009 vs May, 2006 Release date over 2 years later
Front view of AMD Athlon X2 4000+

Reasons to consider the
AMD Athlon X2 4000+

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Much lower typical power consumption 52.81W vs 101.56W Around 50% lower typical power consumption
Much lower annual home energy cost 15.66 $/year vs 30.11 $/year Around 50% lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 109.5 $/year Around 50% lower annual commercial energy cost

Benchmarks Real world tests of Phenom II X4 940 vs Athlon X2 4000+

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 II X4 940
121,350 MB/s
Athlon X2 4000+
62.3 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom II X4 940  vs
Athlon X2 4000+ 
Clock speed 3 GHz 2.1 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 125W 65W
Annual home energy cost 30.11 $/year 15.66 $/year
Annual commercial energy cost 109.5 $/year 56.94 $/year
Performance per watt 1.19 pt/W 0.73 pt/W
Typical power consumption 101.56W 52.81W

details

Phenom II X4 940  vs
Athlon X2 4000+ 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 2 MB 1 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
L3 cache 6 MB 0 MB
L3 cache per core 1.5 MB/core 0 MB/core
Manufacture process 45 nm 65 nm
Max CPUs 1 1
Operating temperature Unknown - 62°C Unknown - 55°C

overclocking

Overclocked clock speed 3.72 GHz 2.77 GHz
Overclocked clock speed (Water) 3.83 GHz 3.24 GHz
Overclocked clock speed (Air) 3.72 GHz 2.77 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 II X4 940
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AMD Athlon X2 4000+
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