Date: Thu, 16 May 1996 22:49:17 -0700 From: "Michael L. VanLoon -- HeadCandy.com" <michaelv@HeadCandy.com> To: Warner Losh <imp@village.org> Cc: Narvi <narvi@haldjas.folklore.ee>, "Serge A. Babkin" <babkin@hq.icb.chel.su>, hackers@freebsd.org Subject: Re: EDO & Memory latency Message-ID: <199605170549.WAA15833@MindBender.HeadCandy.com> In-Reply-To: Your message of Thu, 16 May 96 12:57:02 -0600. <199605161857.MAA04204@rover.village.org>
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>: The external bus of the Pentium 75 should be 50Mhz. It is 1.5x50, not >: 3x25. 60ns EDO sounds like an overkill for a Pentium 75 though... >: I would use a quicker processor and (120) with ordinary memory >: (fast-page, 70ns) - but the likes may vary. >This reminds me of a question that I've wanted to ask for a while. >Does anybody know where I can find a good writeup on the various >Pentium chip speeds and how they relate to bus speeds? http://www.intel.com/ http://www.amd.com/ http://www.cyrix.com/ Basically, it's probably either a multiple of 60 or 66.67MHz. I think the P75 is the only chip that operates at 50MHz. This is the speed of the local _memory_ bus (to the cache and ram). Take the above speeds and divide by two for the PCI bus speed (25, 30, 33.3). >I'm most interested in the P5-83 which is an upgrade to my dx2-66. It >sounds as if it is running at 2.5x my bus speed, which is odd to say >the least. That isn't a true Pentium. And, I don't know why they chose that, but yes, it would have to be 2.5x 66MHz if it plugs into a 66MHz socket. I personally wouldn't bother with the Intel 486->"P5" chip. It's over-priced and under-powered compared to the Cyrix and AMD 5x86 chips. ----------------------------------------------------------------------------- Michael L. VanLoon michaelv@HeadCandy.com --< 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... Roll your own Internet access -- Seattle People's Internet cooperative. If you're in the Seattle area, ask me how. -----------------------------------------------------------------------------
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