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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!zeos!kgermann
- From: kgermann@zeos.com (Ken Germann)
- Subject: Re: Is a 486-33 with 0 ws cache faster than a 486-50 with 1 ws ?
- Organization: Zeos International, Ltd
- Distribution: usa
- Date: Sat, 22 Aug 1992 06:33:39 GMT
- Message-ID: <1992Aug22.063339.22929@zeos.com>
- References: <1992Aug16.060405.15165@ariel.ec.usf.edu> <1992Aug21.144712.26345@Warren.MENTORG.COM>
- Lines: 43
-
- In article <1992Aug21.144712.26345@Warren.MENTORG.COM> stu@Warren.MENTORG.COM (Stu Brown) writes:
- >From article <1992Aug16.060405.15165@ariel.ec.usf.edu>, by fevrier@sunburn.ec.usf.edu. (Ian Fevrier (EE)):
- >>
- >>
- >>
- >> HELP!!!
- >> I just upgraded from a 486-33 to a 486-50 and have noticed a
- >> few strange things that I can't understand.
- >>
- >> The 486-33 cache operated at zero wait state using 25ns
- >> sram; at 33mhz that works out to 30ns per hit .
- >>
- >> On the 486-50 the cache (20ns chips) operates at 1 wait
- >> state. At 50mhz that's 40ns per hit ??????
-
- The clock cycle on the motherboard is probably being split
- to 25 Mhz before accessing system memory. This would be the result
- of using a 33 Mhz chip set on the motherboard. Landmark 2.0 and
- MIPS will show a better processor benchmark than what Norton will.
- There are significant differences in benchmarks.
-
- >An article in Sept Computer Shopper said that some vendors were
- >using 33MHz board designs and just upgrading chups to 50MHz. I would
- >certainly want a board that was designed for 50MHz is I paid that
- >premium. Since there is no way to verify that a vendor is doing
- >this until after you've bought the board (and can't return it),
- >I was really bothered by that.
- >I was suprised to learn that a 486/33 was so much faster than a 386/33
- >and that a 486/50 was not that much faster than a 486/33 (considering
- >the >$200 price difference).
-
- The speed on the DX-50 needs to be check with multiple benchmarks to
- get the true speed and feel for what is going on with the particular
- board design. Norton SI gives an overall system index for performance.
- When the motherboard clock cycle is being split to 25 mhz to access
- memory you essentially have a DX2-50 except when you put on a
- 50 Mhz 128k cache.
-
- --
-
- Ken Germann ZEOS International, Ltd.
- Technical Support support@zeos.com.
- Operating Systems Group. os@zeos.com
-