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Documented Pentium clock speeds (CPU,ext mem,PCI) from a mail message

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from Rodney Grimes.

Mentioned that you need 5MB to install FreeBSD, or 4MB if you use
boot4.flp.
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obrien 1996-12-09 10:59:36 +00:00
parent 6e20bfde1e
commit f2a6565fa9
1 changed files with 50 additions and 2 deletions
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52
share/doc/handbook/hw.sgml
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@ -1,4 +1,4 @@
<!-- $Id: hw.sgml,v 1.50 1996/12/03 23:40:11 mpp Exp $ -->
<!-- $Id: hw.sgml,v 1.51 1996/12/05 03:30:59 jkh Exp $ -->
<!-- The FreeBSD Documentation Project -->
<!--
@ -316,8 +316,56 @@ Slippery when wet. Beware of dog.
</descrip>
</p>
<sect1><heading>* CPUs/FPUs</heading>
<sect1><heading>CPUs/FPUs</heading>
<sect2><heading>* Pentium Pro class</heading>
<sect2><heading>Pentium class</heading>
<sect3><heading>Clock speeds</heading>
<p><em>Contributed by &a.rgrimes;.<newline>1 Octomber 1996.</em></p>
<p>Pentium class machines use different clock speeds for the various
parts of the system. These being the speed of the CPU, external
memory bus, and the PCI bus. It is not always true that a "faster"
processor will make a system faster than a "slower" one, due to
the various clock speeds used.
Below is a table showing the differences:
<p>
<tscreen><verb>
Rated External Clock External to PCI Bus
CPU and Memory Bus Internal Clock Clock
MHZ MHZ** Multiplier MHZ
60 60 1.0 30
66 66 1.0 33
75 50 1.5 25
90 60 1.5 30
100 50* 2 25
100 66 1.5 33
120 60 2 30
133 66 2 33
150 60 2.5 30
166 66 2.5 33
180 60 3 30
200 66 3 33
* The Pentium 100 can be run at either 50MHz external clock with
a multiplier of 2 or at 66MHz and a multiplier of 1.5.
** 66 Mhz may actually be 66.667 MHz, but don't assume so.
</verb></tscreen>
<p>As can be seen the best parts to be using are the 100, 133, 166
and 200, with the exception that at a mulitplier of 3 the CPU
starves for memory.
<sect2><heading>* 486 class</heading>
<sect2><heading>* 386 class</heading>
<sect2><heading>286 class</heading>
<p>Sorry, but FreeBSD does not run on 80286 machines. It is nearly
impossible to run today's large full-featured UNIXes on such
hardware.
<sect1><heading>* Memory</heading>
<p>The mininum amount of memory you must have to install FreeBSD is 5 MB.
Once your system is up and running you can <ref id="kernelconfig:building"
name="build a custom kernel"> that will use less memory.
If you use the boot4.flp you can get away with having only 4 MB.
<sect1><heading>* BIOS</heading>
<sect><heading>Input/Output Devices<label id="hw:io"></heading>