Date: Mon, 30 Sep 1996 23:26:46 +0300 (EET DST) From: Narvi <narvi@haldjas.folklore.ee> To: "Michael L. VanLoon -- HeadCandy.com" <michaelv@MindBender.serv.net> Cc: "David E. O'Brien" <obrien@nuxi.cs.ucdavis.edu>, freebsd-hardware@FreeBSD.ORG Subject: Re: H/W recommendation Message-ID: <Pine.BSF.3.91.960930232410.7487C-100000@haldjas.folklore.ee> In-Reply-To: <199609300431.VAA05895@MindBender.serv.net>
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On Sun, 29 Sep 1996, Michael L. VanLoon -- HeadCandy.com wrote: > > >> >a) Pentium 120 - 166 Mhz and parity memory (motherboard) > > >> Get a 133 or a 166 (your memory bus will run ~66MHz, and PCI ~33MHz). > >> Don't buy a 120 or 150, because your memory bus will only run 60MHz, > >> and your PCI 30MHz. > > >I'm looking for a list of Pentium chip speeds (AMD & Cyrix too) along > >with their memory bus and PCI bus speeds. Can anybody pass along a > >pointer to such information? Or as a last resort just list them? > > May I ask, did you try thinking about this yourself?: > > http://www.Intel.com/ > http://www.Cyrix.com/ > http://www.AMD.com/ > > Another very interesting site: http://www.x86.com/. > > > It's pretty simple for real Pentiums (or 486s). Anything that is an > even multiple of 33 1/3 (read things as 133.3... 166.667...) runs the > memory bus at 66 2/3 MHz (i. e. "166"MHz Pentium is 2.5 * 66.67MHz). > Anything that isn't an even multiple of of 33.3, and is an even > multiple of 30, runs the PCI bus at 60MHz. The only other option > that's left is multiples of 25 (75MHz Pentiums). Grrrr..... Pentiums being "even multiplies of 30" (60, 120, 150) run the memory bus at 60 Mhz and the PCI bus at 30 Mhz. The Pentium 75 runs the memory bus at 50 Mhz and the PCI bus at 25 Mhz. 75 == 1.5*50 Sander > > The PCI bus on a Pentium runs at half the memory bus speed (the speed > from the CPU to memory and cache). 486s run the memory bus at the > same speed as the PCI bus (i. e. 30 or 33.3MHz in most cases). > > Older VLB 486s preferred multiples of 40MHz, since many VLB cards > could do 40MHz, but PCI is not spec'd to run that fast. > > AMD and Cyrix muddied everything with their weird ratings. At least > they use the same rating system. Their chips are rated for how fast > they run relative to a true Pentium. I. e. a P133+ runs as fast, or > slightly faster than, a 133MHz Pentium on their mix of tests. To find > its true bus speed, consult tables on their web sites (or the person > you're buying it from *should* be able to tell you). > > All of this information is on their respective web sites. > > ----------------------------------------------------------------------------- > Michael L. VanLoon michaelv@MindBender.serv.net > --< Free your mind and your machine -- NetBSD free un*x >-- > NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3, > Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32... > NetBSD ports in progress: PICA, others... > ----------------------------------------------------------------------------- >
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