Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!lll-lcc!styx!ames!ucbcad!ucbvax!jade!eris!mwm From: mwm@eris.BERKELEY.EDU (Mike (No one lives forever.) Meyer) Newsgroups: comp.sys.amiga Subject: Re: MIPS, Turbo Amiga, Mac II Message-ID: <2704@jade.BERKELEY.EDU> Date: Sat, 7-Mar-87 19:08:32 EST Article-I.D.: jade.2704 Posted: Sat Mar 7 19:08:32 1987 Date-Received: Mon, 9-Mar-87 03:34:22 EST References: <12284247071.70.PKG.SPARKMAN@MCC.COM> Sender: usenet@jade.BERKELEY.EDU Reply-To: mwm@eris.BERKELEY.EDU (Mike (No one lives forever.) Meyer) Organization: Missionaria Phonibalonica Lines: 34 In article <12284247071.70.PKG.SPARKMAN@MCC.COM> PKG.SPARKMAN@MCC.COM (Aubrey Sparkman) writes: >Help anyone... I DON'T UNDERSTAND MIPS. Not uncommon. MIPS is best interpreted as "Mythical Instructions Per Second." Problems include: What's an instruction; how do you count them; cacheing of instructions; page faults; etc., etc., etc. The best way to treat MIPS claims in ads is as advertising hype. Wade through the net.arch archives for details. >CSA advertises an expansion box that includes a 14 MHz 68020/68881 combination >and claims a 1 Mip rating. The ad I'm looking at (page 48 of the March/April '87 AmigaWorld) claims that it meets the CMU MMM specs, making it at least a 1 MIPS box (of course, it don't got a million pixels). Given a rought rating of .6 MIPS for a 68000 Amiga (C dhrystones, based on Unix PCC), and the 120% increase claim, you get a 1.32 MIPS machine. >I read yesterday in ELECTRONIC ENGEERING TIMES >that the new MAC is rated at 2 Mips with a 16 MHz 68020/6881 combination. >10 % increase in cpu speed can't give a doubling in MIPS can it? Where did I >lose it? That 120% increase is for the Turbo-Amiga processor alone. It's still running on 16-bit wide memory. The Mac has only 32-bit wide memory. How much difference that makes will depend on the processor architecture. I think 30% is about right for 68K style architechtures, which would make that 1.32 MIPS box a 1.82+ box.