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1997-11-01
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From: ortmann@informatik.tu-muenchen.de (Mathias Ortmann)
Newsgroups: comp.sys.amiga.misc
Subject: Re: Power PC is dead
Date: Wed, 08 Oct 1997 16:49:31 GMT
Organization: Leibniz-Rechenzentrum der Bayerischen Akademie der Wissenschaften
Lines: 127
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"Ian Gledhill" <img4@nospam.aber.ac.uk> wrote:
>>Calm down and try it on a sufficiently fast machine. :-)
>
>I call a K6/200 a sufficiently fast machine for most purposes!
UAE, raytracing and audio encoding are three of the purposes your machine
can never be fast enough for. :-)
>Or would you prefer the kind of machine Altavista use for their search
>engines?
They probably use many machines in parallel, something that UAE wouldn't
profit from at all.
>Or Imperial College's servers? :-)
They are probably optimized for I/O rather than raw CPU power. Not a good
platform for UAE either. :-)
>Having seen the speed increase from a low-end Pentium to a K6/200, I can
>safely extrapolate it has a long way to go before reaching true OCS/ECS
>levels.
The limited bandwidth of the PCI bus prevents UAE from running graphics-
intensive games at 800x600 or 640x480 (where every lo-res pixel has to be
quadrupled), no matter how fast your CPU is. However, it is pretty hard
to find something that does _not_ run at full OCS speed if you use
-O 320:240:xyl on a PPro/Pentium2. Try that with your K6, too.
>>>Yeah, looks great until you actually try and USE it.
>>
>>Imagine - I did!
>
>Then you either have 10 Crays running in parallel, or you found it too slow
>to use in the same way as an Amiga. I use a tiled backdrop in my WB screen
>and windows, and you can see the window drawing each tile when you open
>it. Hardly the same speed as an A3000 in 8 colours, really, is it?
Right. But you are comparing apples with peaches. Compare an A3000/ECS in
8 colours with UAE in OCS/8 colours, please. UAE's blitter emulation is
actually faster than the pixel-by-pixel CPU access that Picasso96 uses
with the regular IPrefs (and even FastIPrefs, AFAIK) to draw the tiled
backdrop.
>>Where did I claim that UAE beats a PicassoIV or CyberVision64?
>
>You didn't, but you *did* avoid his question.
He asked if UAE can use graphics cards to speed things up.
>His point was that an Amiga uses graphics cards: UAE can't come close
>to that, therefore UAE isn't as fast as an A3000.
This is a somewhat weird chain of conclusions: _Because_ the Amiga uses
graphics cards _and_ UAE is slower than an Amiga equipped with a PicassoIV
or Cybervision*, it _isn't_ as fast as an A3000 _w/o_ a graphics card?
>At least you didn`t say that it was as fast as a gfx card Amiga!
It is not.
>>We were talking about an A3000, which is *not* a higher end Amiga.
>
>It's certainly higher end than A500/A1000/A2000/A2500/A1200.
>Hang on, that means it's only lower end to an A4000.
>Sounds like higher end to me.
Actually, it is higher end to an A4000 in some aspects, sadly enough.
>>> It IS not, you KNOW it is not and it has a LONG way to go
>>>before it reaches the same levels as the Amiga 3000s and such have now.
>>
>>Invalid generalization?
>
>No. Valid generalization.
>We're talking about UAE on today's processors, not NASA's latest super nitrogen-
>cooled quintuple-parallel processing chips or something equally unrealistic.
A PentiumII-300 is available today, isn't it?
>>Sure it isn't. My A3000 flickers pitifully, UAE doesn't. Just to name an
>>example. :-)
>
>You've got something wrong with your A3000 then!
Does "not being equipped with a graphics card" imply that there is something
wrong with an Amiga? Oh... Just like in the PC world. :-)
>>Depends on the host machine you are running it on.
>
>We're talking real, available machines.
I've received reports from freaks running WinUAE on overclocked PentiumIIs
(337.5 MHz). Somehow, those machines must have been available to them. However,
you are absolutely right when claiming that probably 98% of all existing PCs
are not powerful enough to run WinUAE adequately - and this is even covered in
the documentation. Search for the string "1998". :-)
>UAE may have a bright future, but by the time it's up to A3000 levels,
>Amigas will be way ahead of it.
This is very questionable. By the end of 1999, WinUAE will be available as an
IA64 binary, running on 700+ MHz CPUs with 100+ MHz memory and 66 MHz PCI
or even faster AGP buses, while the Amiga community (particularly George Noel)
will still devote itself to a neverending flame war about whether that new
machine AI is trying to sell to them actually deserves to be called "Amiga" -
after all, it is lacking all those cutely-named custom chips and doesn't run
any of the hardware-banging old software - except through, you guessed it,
an emulation like UAE.
>There's not much difference between a PPro/233 and a K6/200, BTW.
With gcc-compiled binaries, the low locality of UAE's memory accesses and
the high amount of PCI traffic UAE causes, the PPro (on a Natoma or LX
board) beats the K6 hands down.
>They're both VERY fast chips, and I severely doubt there's much difference
>in UAE usage.
Judging from the feedback I've gotten from K6 users, the PPro is the platform
of choice for UAE, only to be beaten by the PentiumII at an at least
30% higher clock rate.
--
Mathias Ortmann ortmann@informatik.tu-muenchen.de
UAE 0.6.9 Win32/DirectX @ http://www.informatik.tu-muenchen.de/~ortmann/uae/