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AMD K6-2 400 MHz - AMD-K6-2/400AFR

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AMD K6-2 400 MHz specifications

General information
TypeCPU / Microprocessor
Market segmentDesktop
FamilyAMD K6-2
CPU part numberAMD-K6-2/400AFR is an OEM/tray microprocessor
Frequency  ? 400 MHz
Bus speed  ? 66 MHz or 100 MHz
Clock multiplier  ? 
  • 6 (66 MHz bus)
  • 4 (100 MHz bus)
Package321-pin ceramic staggered PGA
1.95" x 1.95" (4.95 cm x 4.95 cm)
AMD Package number26351
SocketsSocket 7 (66 MHz bus)
Super 7 (100 MHz bus)
Introduction date16-Nov-98
Price at introduction$283
Architecture / Microarchitecture
Processor core  ? CXT
Manufacturing process0.25 micron
9.3 million transistors
Data width32 bit
Floating Point UnitIntegrated
Level 1 cache size  ? 32 KB code with 20 KB pre-decode cache
32 KB writeback data
Physical memory4 GB
Pipeline6 stage
  • MMX instructions
  • 3DNow! technology
Low power features
  • Halt state
  • Stop Grant state  ? 
  • Stop Grant Inquire state
  • Stop Clock state
Electrical / Thermal parameters
V core  ? 2.2V ± 0.1V
Min/Recommended/Max V I/O or secondary3.135V / 3.3V / 3.6V
Minimum/Maximum operating temperature  ? 0°C - 70°C
Minimum/Typical/Maximum power dissipation4 Watt (Stop Clock mode) / 10.15 Watt / 16.9 Watt
Notes on AMD AMD-K6-2/400AFR
  • This processor supports both 66 MHz (Socket 7) and 100 MHz (Super 7) bus frequences. For 66 MHz bus speed use 6x clock multiplier, for 100 MHz bus speed use 4x clock multiplier.

Detailed side-by-side comparison

For detailed comparision of the AMD K6-2 400 MHz and any other other chip from our CPU database type in a chip name and/or its partial specs:

You can specify any of the following: manufacturer name, family name, model number, part number, core name, socket name, operating frequency, bus speed, and the last level cache. Here are examples of searches: AMD-K6-2/400AFR, AMD K6-2 400MHz, CXT Socket 7 (66 MHz bus); Super 7 (100 MHz bus)

K6-2 400 MHz Overclocking

Sorry, overclocking information for the processor is not available at this time.

Compare AMD AMD-K6-2/400AFR benchmark results with all tested CPUs from one of the following families:

To compare this K6-2 CPU with any tested processor please proceed to

AMD K6-2 400 MHz Benchmarks

The graphs below show up to 10 microprocessors with approximately the same level of integer (CPU), floating-point (FPU), SIMD and memory performance. All processors were not overclocked, and were tested at a nominal frequency, with a stock heatsink and default BIOS settings. Click on the '?' mark next to each model name to see specifications of that model, and details of the test platform. To find out how the AMD-K6-2/400AFR compares to other CPUs in specific benchmarks or in aggregate milti-threading performance please see benchmark tools section on the right.

Benchmarked processor

CPU ID:058Ch
CPU vendor string:AuthenticAMD
CPU name string:AMD-K6(tm) 3D processor

Integer performance

Part number   Result
AMD K6-2 450MHz AMD-K6-2/450AFX  ? 
AMD K6-2P 450MHz AMD-K6-2/450ADK  ? 
AMD K6-III 400MHz AMD-K6-III/400 (65C 2.4V ES)  ? 
Intel Pentium II 266MHz 80522PX266512EC  ? 
Intel Celeron 266MHz Celeron 266  ? 
AMD K6-2 400MHz AMD-K6-2/400AFR  ? 
AMD K6-2P 400MHz AMD-K6-2/400AFK  ? 
AMD K6-III-P 366MHz AMD-K6-III/366AFK  ? 
Cyrix MII MII-433GP (100 MHz 2.2V)  ? 
AMD K6-2P 380MHz AMD-K6-2/380AFK  ? 
AMD K6-2 380MHz AMD-K6-2/380AFR  ? 
AMD K6-III-P 350MHz AMD-K6-III/350AFK  ? 

Floating Point performance

Part number   Result
Intel Celeron 400MHz 80524RX400128  ? 
Intel Celeron 400MHz FV80524RX400128  ? 
Intel Celeron 366MHz 80524RX366128  ? 
Intel Celeron 366MHz FV80524RX366128  ? 
AMD K6-III 400MHz AMD-K6-III/400 (65C 2.4V ES)  ? 
AMD K6-2 400MHz AMD-K6-2/400AFR  ? 
AMD K6-2P 400MHz AMD-K6-2/400AFK  ? 
Intel Pentium II 350MHz 80523PY350512PE SECC2  ? 
Intel Pentium II 350MHz 80523PY350512PE  ? 
Intel Pentium II 350MHz 80523PY350512  ? 
AMD K6-2P 380MHz AMD-K6-2/380AFK  ? 
AMD K6-2 380MHz AMD-K6-2/380AFR  ? 

MMX / SSE / SSE2 performance

Part number   Result
AMD K6-2 450MHz AMD-K6-2/450AFX  ? 
AMD K6-2P 450MHz AMD-K6-2/450ADK  ? 
Intel Celeron 533MHz FV80524RX533128  ? 
AMD K6-III 400MHz AMD-K6-III/400 (65C 2.4V ES)  ? 
AMD K6-2P 400MHz AMD-K6-2/400AFK  ? 
AMD K6-2 400MHz AMD-K6-2/400AFR  ? 
Intel Celeron 500MHz FV80524RX500128  ? 
AMD K6-2P 380MHz AMD-K6-2/380AFK  ? 
AMD K6-2 380MHz AMD-K6-2/380AFR  ? 
AMD K6-III-P 366MHz AMD-K6-III/366AFK  ? 
AMD K6-2P 366MHz AMD-K6-2/366AFK  ? 

CPU ID information for the K6-2 400 MHz

Our CPUID database contains 2 records for this microprocessor. See all submitted records.

Use our CPU identification tool to check features of your CPU.

NOTE: The CPU ID information below was taken from one CPU and may include features that are not present in all different steppings of the AMD K6-2 AMD-K6(tm) 3D CPU.

CPU Family:K6-2
Model Number:AMD-K6(tm) 3D
Frequency:400 MHz
Part number:
Stepping Code:
Submitted by:Juan Antonio G. Mariņas
General information
Processor name (BIOS):AMD-K6(tm) 3D processor
Processor type:Original OEM Processor
CPUID signature:58C
Family: 5 (05h)
Model: 8 (08h)
Stepping:12 (0Ch)

Cache: L1 data L1 instruction
Size: 32 KB 32 KB
Associativity: 2-way set associative 2-way set associative
Line size: 32 bytes 32 bytes
Lines per tag: 2 2
Instruction set extensionsAdditional instructions
Major featuresOther features
On-chip Floating Point Unit Debugging extensions
  Machine check exception
  Model-specific registers
  Page global extension
  Page-size extensions (4MB pages)
  Time stamp counter
  Virtual 8086-mode enhancements

CPUs, related to AMD K6-2 400 MHz (AMD-K6-2/400AFR)

Model Frequency L1
AMD K6-2 family, Socket 7 / Super socket 7
   K6-2 300 MHz (AMD-K6 3D/300AFR)300 MHz64 KB >
   K6-2 300 MHz (AMD-K6-2/300AFR)300 MHz64 KB >
   K6-2 333 MHz (AMD-K6 3D/333AFR)333 MHz64 KB >
   K6-2 333 MHz (AMD-K6-2/333AFR)333 MHz64 KB >
   K6-2 400 MHz (AMD-K6-2/400AFQ)400 MHz64 KB >
   K6-2 400 MHz (AMD-K6-2/400AFR)400 MHz64 KB  
   K6-2 400 MHz (AMD-K6-2/400AHX)400 MHz64 KB >
AMD K6-2 family, K6 micro-architecture, Other sockets
   K6-2 450 MHz (AMD-K6-2/450AHX)450 MHz64 KB >
   K6-2 475 MHz (AMD-K6-2/475AFX)475 MHz64 KB >
   K6-2 475 MHz (AMD-K6-2/475AHX)475 MHz64 KB >
   K6-2 500 MHz (AMD-K6-2/500AFX)500 MHz64 KB >
   K6-2 500 MHz (AMD-K6-2/500AHX)500 MHz64 KB >
   K6-2 533 MHz (AMD-K6-2/533AFX)533 MHz64 KB >
   K6-2 550 MHz (AMD-K6-2/550AFX)550 MHz64 KB >
   K6-2 550 MHz (AMD-K6-2/550AGR)550 MHz64 KB >
Other families, K6 micro-architecture, Socket 7 / Super socket 7
   K6-III 333 MHz (AMD-K6-III/333AFR)333 MHz64 KB256 KB>
   K6-III 400 MHz (AMD-K6-III/400AFR)400 MHz64 KB256 KB>
   K6-III 400 MHz (AMD-K6-III/400AHX)400 MHz64 KB256 KB>
 • Within each category, the CPUs are sorted from slower (at the top) to faster (at the bottom)
 • Background color of specs and features indicate whether they are better or worse than similar spec/feature of the K6-2 400 MHz (AMD-K6-2/400AFR)
 • Click on the >  icon to compare any CPU in the table with the AMD K6-2 400 MHz (AMD-K6-2/400AFR) (Javascript required).
 • List of related CPUs is not complete.

Pictures (6)

AMD K6-2 400 MHz - AMD-K6-2/400AFR

400 MHz
321-pin ceramic staggered PGA
AMD K6-2 400 MHz - AMD-K6-2/400AFR
2006-10-16 23:01:07
Posted by: Barrett R. de Visser

Better Picture
2008-03-24 08:09:41
Posted by: Peter Barilla

Better Picture
better picture ;-)
2008-03-24 10:14:43
Posted by: Peter Barilla

better picture ;-)
AMD K6-2 400 - AMD-K6-2/400AFR
2009-09-13 02:23:40
Posted by: HO HungKei

AMD K6-2 400 - AMD-K6-2/400AFR
2010-06-03 05:21:08
Posted by: Fuynfactory

Comments (3)

You're welcome to post suggestions, corrections, your own personal AMD K6-2 400 MHz review, or your experience with the microprocessor. Please do not ask upgrade and troubleshooting questions, and do not start discussions.

An old-timer, but great in its era

2007-02-27 04:15:11
Posted by: Tony

This was the processor that powered my family's first computer, an old Compaq Presario. At the time, the only thing faster was an AMD K6-2 450. I can remember my father berating the deathly slow Internet performance and wondering perhaps if the extra 50 MHz would have been worth the money. Of course we were on dial up at that point, so everything was slow. Nevertheless, this was cutting edge for late 1998.

The only quantitative measurement I can make for this processor is my memory of having defragmented two equally-fragmented hard drives across this platform and another (on the K6-2 and on a newer Athlon machine). The 1 GHz Athlon took about half an hour to power through about seven gigabytes of heavily-fragmented data. The K6-2 took about six hours, which is entirely disproportionate to the clock speed difference. Clearly, though the other components obviously contributed, the Athlon architecture was greatly superior.


2008-03-25 18:49:12
Posted by: Thomsonicus

I remember these K6's were really hard to overclock. A 50MHz overclock at 2.4V was almost always reachable, but anything higher required about 2.8V or even more. I remember reaching about 525MHz and frying the processor at 3.0V and my MVP3 board with it (a shame 'cause it OCed my P120 at 200MHZ!)

Powered my first PC

2012-04-22 02:37:26
Posted by: Mark L

I still have the board and CPU. It wasn't bad for the time (it ran Windows 98 SE) and it still runs...very, very slowly. It struggles mightily with most modern Linux distros, I'd like to try a stripped-down distro built from the base up or something like Puppy Linux.

The price sure beat Intel at the time, and the performance was almost as good though.

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