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Differences What are the advantages of each

Front view of Intel Core2 QX9775

Reasons to consider the
Intel Core2 QX9775

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Much more l2 cache 12 MB vs 0.5 MB 24x more l2 cache; more data can be stored in the l2 cache for quick access later
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
More cores 4 vs 2 Twice as many cores; run more applications at once
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much more l2 cache per core 3 MB/core vs 0.25 MB/core 12x more l2 cache per core
Much better overclocked clock speed (Air) 4.04 GHz vs 3.23 GHz More than 25% better overclocked clock speed (Air)
Higher clock speed 3.2 GHz vs 3.1 GHz Around 5% higher clock speed
Much better overclocked clock speed (Water) 4.45 GHz vs 3.23 GHz Around 40% better overclocked clock speed (Water)
Lower annual home energy cost 36.13 $/year vs 37.88 $/year Around 5% lower annual home energy cost
Front view of Intel Core i3 2100

Reasons to consider the
Intel Core i3 2100

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly lower typical power consumption 98.28W vs 121.88W Around 20% lower typical power consumption
Much higher Maximum operating temperature 69.1 °C vs 63 °C Around 10% higher Maximum operating temperature
Much lower annual commercial energy cost 93.47 $/year vs 131.4 $/year Around 30% lower annual commercial energy cost
Newer Jan, 2011 vs Feb, 2008 Release date over 2 years later

Benchmarks Real world tests of Core2 QX9775 vs Core i3 2100

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core2 QX9775
11,259
Core i3 2100
4,786

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core2 QX9775
134,400 MB/s
Core i3 2100
153,100 MB/s

Specifications Full list of technical specs

summary

Core2 QX9775  vs
Core i3 2100 
Clock speed 3.2 GHz 3.1 GHz
Cores Quad core Dual core
Socket type
LGA 771
LGA 1155
Is unlocked Yes No

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 150W 65W
Annual home energy cost 36.13 $/year 37.88 $/year
Annual commercial energy cost 131.4 $/year 93.47 $/year
Performance per watt 1.53 pt/W 1.41 pt/W
Typical power consumption 121.88W 98.28W

details

Core2 QX9775  vs
Core i3 2100 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 12 MB 0.5 MB
L2 cache per core 3 MB/core 0.25 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 2 1
Clock multiplier 8 31
Operating temperature Unknown - 63°C Unknown - 69.1°C

overclocking

Overclocked clock speed 4.04 GHz 3.23 GHz
Overclocked clock speed (Water) 4.45 GHz 3.23 GHz
PassMark (Overclocked) 1,791.4 1,518.9
Overclocked clock speed (Air) 4.04 GHz 3.23 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics 2000
Number of displays supported N/A 2
GPU clock speed N/A 850 MHz
Turbo clock speed N/A 1,100 MHz

bus

Architecture FSB DMI
Number of links 1 1
Intel Core2 QX9775
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Intel Core i3 2100
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