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From: phil@brahms.amd.com (Phil Ngai)
Newsgroups: comp.sys.ibm.pc
Subject: Ignorance, was Which is fastest 386/33 or 486/25 ?
Message-ID: <1990Jul13.185246.7777@amd.com>
Date: 13 Jul 90 18:52:46 GMT
References: <205440@<1990Jul5> <17200007@yoyodyne>
Sender: usenet@amd.com (NNTP Posting)
Reply-To: phil@brahms.AMD.COM (Phil Ngai)
Organization: Advanced Micro Devices, Inc. Sunnyvale CA
Lines: 19

In article <17200007@yoyodyne> koziol@yoyodyne.ncsa.uiuc.edu writes:
|
|One of the main reasons for the '486 being about twice as fast as the '386
|is because of the way the chips are clocked.  The '386 (and also the '030
|BTW) use a divide-by-two clock from the system clock to actually clock the 
|internals of the chip.  The '486 (and the '040) are syncronously tied to the
|system clock, i.e. they actually clock at 25Mhz at a system clock of 25Mhz
|as opposed to the '386 which is internally dropped to 12.5Mhz at a 25Mhz
|system clock.

Wrong, bozo. A 25 Mhz 386 actually gets 50 Mhz in and the 386 divides
it down to 25 Mhz.

Please do not post misinformation.

--
--
Phil Ngai, phil@amd.com		{uunet,decwrl,ucbvax}!amdcad!phil
PALASM 90: it's not the same old PALASM any more!