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Intel Core 2 Quad Q8400 vs Core i7-920

Mini Review

Intel Core 2 Quad Q8400 advantages

  • The CPU has 27% lower power consumption than the Intel Core i7-920.

Intel Core i7-920 advantages

  • The Core i7-920 incorporates Hyper-Threading technology, which allows this processor to run twice as many threads.
  • It is estimated that single-threaded performance of the CPU is better.
  • In multi-threaded tasks, it is estimated that the microprocessor has 63% higher performance.
  • The Core i7-920 processor features SSE4.2 instructions.

Q8400 vs i7-920 estimated performance

The charts in the section below demonstrate relative performance of Core 2 Quad Q8400 and Core i7-920 processors. Performance numbers for Core i7-920 were determined based on a variety of benchmarks. Results for Core 2 Quad Q8400 were approximated from test results of other microprocessors with similar core and microarchitecture. As a note, the estimate has greater error of margin than results obtained using real-world tests. Also, this is an averaged performance, and the difference in individual benchmarks may be worse or better than what you see in the charts here.
Single-threaded performance
2
1.6
1.2
0.8
0.4
0
 
 
1
 
1.27
 
 
Higher is better
Multi-threaded performance
2
1.6
1.2
0.8
0.4
0
 
 
1
 
1.63
 
 
Higher is better

  - Intel Core 2 Quad Q8400       - Intel Core i7-920

Q8400 vs i7-920 specifications comparison

The graphs below compare the most important Intel Q8400 and Core i7-920 characteristics. These features, along with an IPC (instructions per cycle) number, determine how well a CPU performs. The "Number of cores / threads" graph displays the number of cores (darker area). Lighter area on the graph corresponds to the number of extra threads, offered by Hyper-Threading technology. The "Operating frequency" chart uses dark color to represent base frequency, while lighter area is for additional frequency, provided by Turbo feature. Darker area on the "On-chip cache" graph is for the On-chip L2 cache. Lighter area is for the L3 cache cache. Although the L3 cache cache is usually larger than the On-chip L2 cache, it is always slower.

The number of cores / threads
9
7.2
5.4
3.6
1.8
0
 
 
4
 
8
 
 
Higher is better
Operating frequency
4
3.2
2.4
1.6
0.8
0
 
 
2.67GHz
 
2.93GHz
 
 
Higher is better
On-chip L2 + L3 cache
10
8
6
4
2
0
 
 
4MB
 
9MB
 
 
Higher is better
Thermal Design Power
200
160
120
80
40
0
 
 
95W
 
130W
 
 
Lower is better

  - Intel Core 2 Quad Q8400       - Intel Core i7-920

Detailed side by side comparison of Core 2 Quad Q8400 vs Intel i7-920 specs can be found in the "Specifications" tab.


Pros and Cons summary

Core 2 Quad Q8400 Core i7-920
General recommendations:
Somewhat lower power
  General recommendations:
Performs somewhat faster in single- and multi-threaded programs,
Executes more threads at once,
Supports SSE4.2 instructions

Drawbacks:

Cannot execute as many threads at once,
Lacks some instructions
 

Drawbacks:

Higher power consumption

Similar processors

Core 2 Quad Q8400 Core i7-920
 

Similar CPUs use the same socket and architecture as Intel Core 2 Quad Q8400 and Core i7-920.


Where to buy


Both processors are obsolete. Hence, the best place to search for them is eBay. Third party vendors at Amazon may also carry them.
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More comparisons

Compare Intel Core 2 Quad Q8400 with...

Other Core i7 CPU:

Any CPU:


Compare Intel Core i7-920 with...

Other Core 2 Quad CPU:

Any CPU:


Note: To see differences with any CPU, type in any combination of the following into the "Any CPU" field: manufacturer name, full or partial family name, model number, part number, core name, socket name, operating frequency, bus speed (must have FSB suffix), and the last level cache. Here are some valid searches:

  i5-3570K
  Intel Celeron 2 GHz
  Core
  Pentium 4 800FSB
  AMD 3.3GHz 8MB

Specifications

Please visit Intel Core 2 Quad Q8400 and Intel Core i7-920 pages for more detailed specifications of both microprocessors.

 Intel Core 2 Quad Q8400Intel Core i7-920
Market segmentDesktop
ManufacturerIntel
FamilyCore 2 QuadCore i7
Basic details
Model numberQ8400i7-920
CPU part numberAT80580PJ0674ML
AT80580PJ067HL
AT80601000741AA
Box part numberBX80580Q8400
BXC80580Q8400
BX80601920
BXC80601920
Introduction dateApril 19, 2009November 17, 2008
 
CPU features
Core nameYorkfieldBloomfield
Platform name X58
MicroarchitectureCoreNehalem
Technology (micron)0.045
Data width (bits)64
SocketSocket 775Socket 1366
Frequency (MHz)2667
Turbo Frequency (MHz) 2933 / 2800 / 2800 / 2800
Bus speed (MHz)13332400 (HT/QPI)
Clock Multiplier8 
L1 cache128 KB (code) / 128 KB (data)
L2 cache (KB)40961024
L3 cache (KB) 8192
Max temperature (°C)71.467.9
TDP (Watt)95130
Max power dissipation (Watt) 230.14
Core voltage (V)0.85 - 1.36250.8 - 1.375
Cores4
Threads48
Multiprocessing1
 
Instruction set extensions
AMD64 / EM64T 64-bit technology+
MMX+
SSE+
SSE2+
SSE3+
SSE4.1+
SSE4.2-+
SSSE3 / Supplemental SSE3+
 
Supported technologies
Hyper-Threading-+
PowerNow! / Enhanced SpeedStep+
Turbo Core / Turbo Boost-+
Virtualization+
Virus Protection / Execute Disable bit+
 
Integrated Graphics
GPU TypeNone
 
Integrated Memory Controller(s)
The number of controllers01
Notes:

Rows with different specifications or features are highlighted.

For detailed specifications of "Intel Core 2 Quad Q8400" or "Intel Core i7-920" parts please click on the links in the table header.

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