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- Newsgroups: comp.arch
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- From: stripes@pix.com (Josh Osborne)
- Subject: Re: IBM Clock-tripled 486
- Message-ID: <Bxw6tK.KMM@pix.com>
- Sender: news@pix.com (The News Subsystem)
- Nntp-Posting-Host: pandora.pix.com
- Organization: Pix Technologies -- The company with no adult supervision
- References: <1e937lINNq50@gap.caltech.edu>
- Date: Wed, 18 Nov 1992 03:24:56 GMT
- Lines: 33
-
- In article <1e937lINNq50@gap.caltech.edu> rrm@ssdp.caltech.edu writes:
- >So, I understand that IBM announced a clock-tripled (33MHz/99MHz) version
- >of the 486 (a DX3?) at Comdex. Can anyone in the know at IBM (or Intel)
- >comment further on this? IBM supposedly designed this chip under their
- >existing licensing agreement with Intel.
-
- The only 486 CPU that I know of that IBM announced is a 486SXL, which is
- a clock dubled 486 in a 386SX pinout (for the portable market). Even
- with it's extra large cache it seems a tad bit silly to me (the clock).
-
- > If I understand that agreement
- >properly, IBM has 6 months to exclusively do their thing with it before
- >Intel can provide their own version to the masses. Is that correct?
-
- I don't know, but if it is it would give IBM a price advantage even after
- the first 6months... (on their PCs)
-
- >Also, what kind of incremental/marginal gain is there to clock tripling?
- >Does this chip have extra cache to compensate for the additional I/O burden?
-
- I would assume they have at least as much cache as their 486SXL, but I
- don't know. Even if it has NO extra cache the tripled clock would help
- a great deal on floating point ops. How much more on-chip cache would
- it need to signifagntly effect the integer speed (assuming most of the
- int instructions are the one cycle kind...)? And if IBM can make
- a 486 run at 99Mhz what could they have done with a SPARC/MIPS/generic
- RISC CPU?
- --
- stripes@pix.com "Security for Unix is like
- Josh_Osborne@Real_World,The Multitasking for MS-DOS"
- "The dyslexic porgramer" - Kevin Lockwood
- We all agree on the necessity of compromise. We just can't agree on
- when it's necessary to compromise. - Larry Wall
-