Date: Thu, 20 Jun 1996 09:10:04 -0700 From: "Michael L. VanLoon -- HeadCandy.com" <michaelv@HeadCandy.com> To: "Andrew V. Stesin" <stesin@elvisti.kiev.ua> Cc: dutchman@spase.nl (Kees Jan Koster), hardware@freebsd.org Subject: Re: AMD 586 in P24T slot? -- No, P24"D" one Message-ID: <199606201610.JAA28073@MindBender.HeadCandy.com> In-Reply-To: Your message of Thu, 20 Jun 96 14:35:45 %2B0300. <199606201135.OAA13309@office.elvisti.kiev.ua>
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># > Try another CPU -- Intel or AMD (AMD 5x86 strongly recommended,
># > in case your motherboard supports it. If it doesn't, you
># > may try jumper settings for Intel P24D -- theyr'e Ok
># > for AMD 133 too)
># Ummmm. Now this sounds interesting. I lived under the assumption that I
># needed a special mainboard to sport an AMD 133.
> You wasn't 100% correct. As about recent 486 boards,
> they usually have AMD 133 explicitly listed in jumper
> setting sheets. As about older ones, the things aren't
> so simple -- you might be lucky with a guessed probability
> of above 80%.
To be more precise, the 5x86 is just a marketing name. It's really a
486DX4. The two things that make it different from "traditional" 486s
are that it has 16K write-back cache (most 486s have 8K write-through
cache; but even Intel makes their 486DX4s with 16K write-back cache
these days), and it runs at a faster clock than any other "486" (AMD
stops their 486DX4 line at 120MHz, and calls the chips above that
5x86, even though they're identical except for the clock speed
[486DX4/100 is 3x33.3MHz, 486DX4/120 is 3x40MHz, and 5x86/133 is
4x33.3MHz]).
> For a pity, attempts to use 5x133 in older boards might
> cause the nessesity of motherboard's BIOS firmware upgrade :(
My BIOS doesn't even know what a DX4 is, but my 5x86 is still working
OK. The only thing is that it runs in write-through mode instead of
write-back. But my L2 cache is write-back, so it's not a huge
penalty.
-----------------------------------------------------------------------------
Michael L. VanLoon michaelv@HeadCandy.com
--< Free your mind and your machine -- NetBSD free un*x >--
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NetBSD ports in progress: PICA, others...
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If you're in the Seattle area, ask me how.
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