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- Newsgroups: comp.sys.amiga.misc,comp.sys.amiga.hardware,comp.sys.amiga.advocacy
- Path: wombat.hanse.de!root
- From: root@wombat.hanse.de (Bernd "Bernie" Meyer)
- Subject: Re: Motorola pricelist (was RE: CPU MHz in A1200+)
- Organization: Private uucp site lost in the voids of the black hole Germany is in the Internet
- Message-ID: <DLIBvw.7y2@wombat.hanse.de>
- References: <wfblanDKJ8Cw.1tn@netcom.com> <4car2m$76h@serpens.rhein.de> <DKtn25.MEC@news.zippo.com> <4cq2ui$j16@serpens.rhein.de> <4ctpl6$12h@dole.uninett.no> <4d0kep$ab6@murphy.servtech.com> <4d1dj9$cmd@serpens.rhein.de> <4d998s$1t8@murphy.servtech.com> <wfblanDL65sp.H0w@netcom.com> <4de3gc$jqq@hyperion.mfltd.co.uk> <wfblanDLFz6q.2EC@netcom.com>
- Date: Sun, 21 Jan 1996 01:23:56 GMT
-
- wfblan@netcom.com (Wells Fargo Bank) writes:
-
- >On a different reply, someone seemed to indicate that at 33MHz, 30ns RAM is
- >really 'needed'. In strict theory, without a 'real world' situation, this
- >is of course true. However, when you have to factor in the workings of your
- >computer, layers, intuition, BIOS, and whatever else interacts and sets
- >between your CPU and RAM, this goes down to the 70ns/60ns arena.
-
- Even in a "real world" situation, this is absolutely 100% true. Why do you
- think a 486/33 takes 4 clock cycles per burst for the first access to main
- memory? Certainly not because of "intuition, BIOS and whatever else". No,
- simply because the RAM doesn't give back the values any earlier.
-
- A further point for this argument is that the cache _is_ in the 15-25ns
- area (which is 30ns minus "workings of the computer, layers" [which make
- the time that is left for the memory shorter, not longer]). And cache
- typically gets accessed in a 1-1-1-1 burst.
-
- On a Pentium with 66MHz external clock, the first access to the cache is
- taking two clock cycles. Subsequent burst accesses are anticipated and served
- in a single clock cycle. This, of course, only if you have pipelined burst
- cache....
-
- Bernie
-
-
- --
- ==============================================================================
- I'm using an experimental version of "nn" to read news. So if anything seems
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-