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Intel Core 2 Quad Q8400 vs Pentium E5800

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Mini Review

Intel Core 2 Quad Q8400 advantages



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is not
available		  

Intel Pentium E5800 advantages



Intel Pentium E5800		  

Q8400 vs E5800 estimated performance

The charts below demonstrate relative performance of Core 2 Quad Q8400 and Pentium E5800 microprocessors. Results for Core 2 Quad Q8400 and Pentium E5800 were approximated from test results of other CPUs with similar core and microarchitecture. As a note, the approximation has greater error of margin than results obtained using real-world benchmarks. Also, this is an averaged performance, and the shown results may differ from results, that you may see in individual tests.
   
  - Intel Core 2 Quad Q8400       - Intel Pentium E5800

Q8400 vs E5800 specifications comparison

The graphs below show the difference between Q8400 and Intel E5800 most important characteristics. These features, along with an IPC (instructions per cycle) number, determine how well a microprocessor performs. Darker area on the "On-chip cache" graph is for the On-chip L1 cache. Lighter area is for the L2 cache cache. Although the L2 cache cache is usually larger than the On-chip L1 cache, it is always slower.

The number of cores / threads
5
4
3
2
1
0		  
 
4
  
2
  
 
Higher is better
Operating frequency
4
3.2
2.4
1.6
0.8
0		  
 
2.67GHz
  
3.2GHz
  
 
Higher is better
  - Intel Core 2 Quad Q8400       - Intel Pentium E5800
On-chip L1 + L2 cache
5000
4000
3000
2000
1000
0		  
 
4352KB
  
2176KB
  
 
Higher is better
Thermal Design Power
110
88
66
44
22
0		  
 
95W
  
65W
  
 
Lower is better

Detailed side by side comparison of Intel Q8400 vs E5800 specs can be found in the Specifications section below. Much more detailed comparison of low level features of both processors you will find in the CPUIDs section.


Pros and Cons summary

Core 2 Quad Q8400 Pentium E5800
General recommendations:
 
   General recommendations:
 

Drawbacks:

 
  

Drawbacks:

 

Similar processors

Core 2 Quad Q8400 Pentium E5800
 

Similar CPUs use the same socket and architecture as Core 2 Quad Q8400 and E5800, but their performance and other characteristics are a bit different.


Where to buy

These microprocessors are no longer produced. Hence, the best place to look for them is eBay. They may also be available from marketplace sellers at Amazon.

Specifications

Please visit Intel Core 2 Quad Q8400 and Intel Pentium E5800 pages for detailed specifications of both microprocessors.

 Intel Core 2 Quad Q8400Intel Pentium E5800
General information
Market segmentDesktop
ManufacturerIntel
FamilyCore 2 QuadPentium Dual-Core
Model numberQ8400E5800
CPU part numberAT80580PJ0674ML
AT80580PJ067HL		AT80571PG0882ML
Box part numberBX80580Q8400
BXC80580Q8400		BX80571E5800
Introduction date  
SocketSocket 775
Processing Unit
Cores42
Threads  
Frequency (MHz)26673200
L1 cache (KB)  
L2 cache (KB)  
Integrated Graphics
GPU Type 
Architecture / Microarchitecture
Microarchitecture 
Core name  
Technology (micron) 
Data width (bits)64
Bus speed (MHz)  
Multiprocessing 
Instruction set extensions
AMD64 / EM64T 64-bit technology 
MMX 
SSE 
SSE2 
SSE3 
SSE4.1  
SSSE3 / Supplemental SSE3 
Supported technologies
PowerNow! / Enhanced SpeedStep 
Virtualization 
Virus Protection / Execute Disable bit 
Integrated Memory Controller(s)
The number of controllers 
Electrical / Thermal parameters
Core voltage (V) 
Max temperature (°C)  
TDP (Watt)  
Notes:

Rows with different specifications or features are highlighted.

Better specifications are shown in green color. Worse specs are shown in red color.

CPUIDs

The table below compares support for x86 extensions and technologies, as well as individual instructions and low-level features of the Intel Core 2 Quad Q8400 and Intel Pentium E5800 microprocessors. Information in this table was retrieved from actual processors using CPUID instruction, and we also utilized internal timer to measure CPU frequency. Be aware that all technologies, disabled in BIOS or by a virtual machine, will be shown as not supported. Different steppings of Intel processors may also have slightly different features. In rare cases, measured frequency may differ from official specifications.

  CPUID 1 CPUID 2
ManufacturerIntel
CPU FamilyCore 2 QuadPentium Dual-Core
Model / Processor NumberQ8400E5800
Measured Frequency2659 MHz3209 MHz
CWID version0.5
Part number (supplied)AT80580PJ0674MLAT80571PG0882ML
Part number (guessed)AT80580PJ0674MLAT80571PG0882ML
General information
VendorGenuineIntel
Processor name (BIOS)Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHzPentium(R) Dual-Core CPU E5800 @ 3.20GHz
Cores42
Logical processors42
Processor typeOriginal OEM Processor
CPUID signature1067A
Family 6 (06h)
Model23 (017h)
Stepping10 (0Ah)
TLB/Cache details64-byte Prefetching
Data TLB: 4-KB Pages, 4-way set associative, 256 entries
Data TLB: 4-MB Pages, 4-way set associative, 32 entries
Instruction TLB: 2-MB pages, 4-way, 8 entries or 4M pages, 4-way, 4 entries
Instruction TLB: 4-KB Pages, 4-way set associative, 128 entries
L1 Data TLB: 4-KB pages, 4-way set associative, 16 entries
L1 Data TLB: 4-MB pages, 4-way set associative, 16 entries
Cache Details
 
Instruction set extensions
 
Additional instructions
 
Major features
 
Other features
 
+ - feature is supported
- - feature is not supported
Features, not supported by all processors in the table, are not displayed

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Last modified: 13 Apr 2025
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