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Differences What are the advantages of each

Front view of AMD Phenom II X4 840

Reasons to consider the
AMD Phenom II X4 840

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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 higher clock speed 3.2 GHz vs 2.5 GHz Around 30% higher clock speed
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 overclocked clock speed (Air) 3.94 GHz vs 3.32 GHz Around 20% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 3.2 GHz vs 2.5 GHz Around 30% better overclocked clock speed (Water)
Front view of AMD A4 3300

Reasons to consider the
AMD A4 3300

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Much more l3 cache 0.5 MB vs 0 MB Compared to all cpus, 0.5 MB l3 cache is just OK
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l3 cache per core 0.25 MB/core vs 0 MB/core Compared to all cpus, 0.25 MB/core l3 cache per core is just OK
Much lower typical power consumption 52.81W vs 77.19W More than 30% lower typical power consumption
Significantly lower annual home energy cost 15.66 $/year vs 22.89 $/year More than 30% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 83.22 $/year More than 30% lower annual commercial energy cost
Newer Sep, 2011 vs Jan, 2011 Release date 8 months later

Benchmarks Real world tests of Phenom II X4 840 vs A4 3300

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 840
129,500 MB/s
A4 3300
104,400 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 840  vs
A4 3300 
Clock speed 3.2 GHz 2.5 GHz
Turbo clock speed 0 GHz None
Cores Quad core Dual core
Socket type
AM3
FM1
Is unlocked No No

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
AMD64
AMD-V
3DNow!
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 65W
Annual home energy cost 22.89 $/year 15.66 $/year
Annual commercial energy cost 83.22 $/year 56.94 $/year
Performance per watt 1.87 pt/W 1.34 pt/W
Typical power consumption 77.19W 52.81W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3

details

Phenom II X4 840  vs
A4 3300 
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 0 MB 0.5 MB
L3 cache per core 0 MB/core 0.25 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 1 1
Voltage range 0.85 - 1.4V 0.91 - 1.41V

overclocking

Overclock popularity 37 3
Overclock review score 5 0
Overclocked clock speed 3.94 GHz 3.32 GHz
Overclocked clock speed (Water) 3.2 GHz 2.5 GHz
Overclocked clock speed (Air) 3.94 GHz 3.32 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 840
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AMD A4 3300
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