Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!news.funet.fi!assari.tut.fi!h112706 From: h112706@assari.tut.fi (Herranen Henrik) Newsgroups: comp.sys.amiga Subject: Re: Amiga Competitiveness. Message-ID: <1990Sep29.081216.17970@assari.tut.fi> Date: 29 Sep 90 08:12:16 GMT References: <1990Sep27.203058.601@sisd.kodak.com> <1990Sep28.193008.6137@sisd.kodak.com> Organization: Tampere University of Technology Lines: 38 In article <1990Sep28.193008.6137@sisd.kodak.com> jeh@sisd.kodak.com (Ed Hanway) writes: >In article peck@ral.rpi.edu (Joseph Peck) writes: >>In article <1990Sep27.203058.601@sisd.kodak.com> jeh@sisd.kodak.com (Ed Hanway) writes: >>>peck@ral.rpi.edu (Joseph Peck) writes: >>>>Here is another opinion on 68000 Amiga's. Why doesn't Commodore start >>>>shipping them with a 14Mhz 68000? [...] >>> >>>I doubt if it would be worth it. There are third-party boards that >>>piggyback a 14MHz 68000 + glue circuitry into the 68000 socket, and >>>I think their overall speedup is something like 10-20%. The problem is >>>that the rest of the machine (memory, custom chips, etc.) still runs at >>>7MHz (and changing that would be a _major_ redesign). [...] >>> >>Hmmmm, like any of the raytracers for example? Or compiling large programs? > >Yes, for an 8-hour ray tracing, saving one hour would be significant. >Ray tracing, however, depends almost entirely on floating point speed. >A 14MHz 68000 won't do a whole lot for that, but an add-on 68881 might. Doesn't floating point calculating use heavily the slowest commands in the 68000/68010, divide and multiply? I've noticed that after I inserted the 68020 in my B2000, many Mandelbrot programs speeded up with 20-25% while AmigaBASIC only gained 5%. Now, wouldn't it be so, that doubling processor speed would give ne about 20-30% more again? After that the overall gain would be over 50% more speed. I don't know if this really would happen, but if a 140 clock cycle DIVU (70 cycles on 68010) execution time could almost be halved, wouldn't it be nice to have a little faster machine to do your n-hour ray tracing/Mandelbroting with? >Ed Hanway >uunet!sisd!jeh -- Name: Henrik 'Leopold' Herranen h112706@lehtori.tut.fi Address: TTKK/P{{rakennuksen neuvonta/PL527/33101 Tampere/Suomi Finlandia "On d{htinen daevas ja kuutamoy|, on morsiamelta katkaistu p{{" E.L.1989