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- From: tmh@keks.first.gmd.de (Thomas Hoberg)
- Newsgroups: comp.sys.intel
- Subject: Re: 386/486 clock (1x or 2x)?
- Message-ID: <TMH.92Jul22194404@keks.first.gmd.de>
- Date: 22 Jul 92 17:44:04 GMT
- References: <RFowler.288@kelvin.jpl.nasa.gov> <3713@svin02.info.win.tue.nl>
- Sender: news@bigfoot.first.gmd.de
- Organization: GMD-FIRST, Berlin
- Lines: 23
- In-reply-to: debra@wsinis07.info.win.tue.nl's message of 22 Jul 92 07:34:59 GMT
-
- In article <3713@svin02.info.win.tue.nl> debra@wsinis07.info.win.tue.nl (Paul De Bra) writes:
- In article <RFowler.288@kelvin.jpl.nasa.gov> RFowler@kelvin.jpl.nasa.gov (Robert A. Fowler) writes:
- >In comp.ibm.pc.hardware there is a thread about weather the 486DX uses a 1x
- >or a 2x clock. I (perhaps mistakenly) said it used a 2x clock, (all of the
- >motherbords I've seen had a 2x occilator) could some one with a real data
- >book clarify?
-
- The 386 uses a 2x clock, whereas the 486 uses a 1x clock.
- A 2x clock has the advantage of delivering a perfectly symmetrical
- 1x clock after halving. A 1x clock needs better clock circuitry to
- make sure it is symmetrical.
-
- Hmm, I was always under the impression that even the 486 used a 2x
- clock up until the 486DX[2]50, which uses a 1x clock. Anyway I have a
- 66MHz oscillator on my 486/33 motherboard.
- ---
- Thomas M. Hoberg | Internet: tmh@first.gmd.de
- 1000 Berlin 41 | tmh@cs.tu-berlin.de
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