CPUBoss Review Our evaluation of Q8400 vs 6238 among all CPUs

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Sky Diver and Cloud Gate

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

5.1

CPUBoss Score

Combination of all six facets

Winner
AMD Opteron 6238 

CPUBoss recommends the AMD Opteron 6238  based on its performance.

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VS

Differences What are the advantages of each

Front view of Intel Core2 Quad Q8400

Reasons to consider the
Intel Core2 Quad Q8400

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Significantly better overclocked clock speed (Water) 3.91 GHz vs 2.9 GHz Around 35% better overclocked clock speed (Water)
Front view of AMD Opteron 6238

Reasons to consider the
AMD Opteron 6238

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Much more l2 cache 12 MB vs 4 MB 3x more l2 cache; more data can be stored in the l2 cache for quick access later
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Supports more CPUs in SMP configuration 4 vs 1 3 supports more CPUs in SMP configuration
Much lower typical power consumption 93.44W vs 135.97W More than 30% lower typical power consumption
More cores 12 vs 4 Three times as many cores; run more applications at once
More threads 12 vs 4 Three times as many threads
Better PassMark score 7,316 vs 3,197 More than 2.2x better PassMark score
Much lower annual home energy cost 27.7 $/year vs 51.39 $/year More than 45% lower annual home energy cost
Newer Nov, 2011 vs Apr, 2009 Release date over 2 years later
Better overclocked clock speed (Air) 3.88 GHz vs 3.48 GHz More than 10% better overclocked clock speed (Air)
Significantly lower annual commercial energy cost 100.74 $/year vs 130.79 $/year Around 25% lower annual commercial energy cost

Benchmarks Real world tests of Core2 Quad Q8400 vs Opteron 6238

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

Core2 Quad Q8400
113,900 MB/s
Opteron 6238
1,470 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core2 Quad Q8400  vs
Opteron 6238 
Clock speed 2.66 GHz 2.6 GHz
Cores Quad core Duodeca core
Socket type
LGA 775
G34

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
Supplemental SSE3
AES

power consumption

TDP 95W 115W
Annual home energy cost 51.39 $/year 27.7 $/year
Annual commercial energy cost 130.79 $/year 100.74 $/year
Performance per watt 0.94 pt/W 1.11 pt/W
Typical power consumption 135.97W 93.44W

bus

Architecture FSB HyperTransport 3.0
Number of links 1 4
Clock speed 1,333 MHz 3,200 MHz

details

Core2 Quad Q8400  vs
Opteron 6238 
Threads 4 12
L2 cache 4 MB 12 MB
L2 cache per core 1 MB/core 1 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 1 4
Clock multiplier 8 16
Operating temperature Unknown - 71.4°C Unknown - 70.4°C

overclocking

Overclock popularity 29 0
Overclocked clock speed 3.48 GHz 3.88 GHz
Overclocked clock speed (Water) 3.91 GHz 2.9 GHz
Overclocked clock speed (Air) 3.48 GHz 3.88 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
Intel Core2 Quad Q8400
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AMD Opteron 6238
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