Re: AMD K5 vs. Intel i586 (a.k.a. "Genuine Pentium")

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Article #2109

#2109

From: Christian Ludloff
Date: Mon, 25 Nov 1996 00:00

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Hello Duane Charron,

> I beg to differ. I am fairly sure that the K5 is not 100% compatible
> with the Pentium. There are some instructions in the Pentium, that
> are not in the K5. That is why I went with the Pentium. Everything
> I have read, and have asked AMD about, is that the K5 is a souped up
> 486.

Nope. K5 supports the full Pentium instruction set, and also all of
the Pentium software features. This includes:

	- RDTSC, RDMSR, WRMSR and CMPXCHG8B
	- TSC, MCE and DE
	- VME and 4MB paging

From that point the K5 is better than the 6x86, which lacks all the
listed stuff (ans still claims to be Pentium-like). For details you
should refer to my website.

Things, K5 lacks, include:

	- local APIC
	- FRC
	- Probe Mode

Maybe you mixed the K5 with the AMD 5x86, which really more is like
a 486DX4 processor, and which lacked all the listed stuff. But hey,
this part is history now.

-- 
Christian Ludloff      http://www.sandpile.org/   Interested in x86 chips?
ludloff@sandpile.org    ftp://ftp.sandpile.org/   Go and visit my website!

Speaking for myself.   Trademarks are property of their respective owners.

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From: Christian Ludloff <ludloff@sandpile.org>
Subject: Re: AMD K5 vs. Intel i586 (a.k.a. "Genuine Pentium")
Date: 1996/11/25
Message-ID: <329A5671.57CC@sandpile.org>
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references: <579hcc$5d2@paperboy.ids.net> <57d93b$h25@hermes.achilles.net> <57dag0$e5t@q.seanet.com>
to: Duane Charron <duanec@mlnk.com>
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