Date: Thu, 28 Aug 1997 10:33:43 -0700 (PDT) From: Howard Lew <hlew@www2.shoppersnet.com> To: "Jay D. Nelson" <jdn@qiv.com> Cc: hardware@FreeBSD.ORG Subject: Re: Q: K5 clock speeds (Was: Re: K6-200 Has anyone ...) Message-ID: <Pine.BSF.3.91.970828102724.24202A-100000@www2.shoppersnet.com> In-Reply-To: <Pine.BSF.3.96.970827223335.1001A-100000@acp.qiv.com>
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On Wed, 27 Aug 1997, Jay D. Nelson wrote: > Thanks for the info. What you are suggesting is that the clock is the > only thing that counts and moving the jumper to x2.5 is all that's > necessary -- regardless of the bios. Why would ASUS issue a bios > upgrade to support 150-166Mhz K5s? (Marketing?) > > -- Jay I haven't seen the ASUS Bios bootup screen, but the K5-PR150 and K5-PR166 were supposed to be 60x1.75 and 66x1.75 respectively on the K5. The K5 was supposed to be an exact Pentium clone (even down to the clock multiplier and bus frequency so you can set the speed equal to its PR #). For example, the K5-PR133 can be jumpered at 66x1.5 (actual clock) or 66x2.0 (PR-clock). Either way, it will run at 100MHz. You can verify this with FreeBSD -- It will say 100MHz clock even with 66x2. Newer Award BIOSes will show the PR # under what used to be the clock frequency for the AMD K5 and Cyrix 6x86. > > On Wed, 27 Aug 1997, Howard Lew wrote: > > >On Wed, 27 Aug 1997, Jay D. Nelson wrote: > > > >> Did you upgrade the bios to support the chip? I just installed this > >> board with a K5-166 -- clocked it at 66Mhz*2 because I wasn't sure. > >> Works fine at 133Mhz though the bios thinks it's 100Mhz. I'm about to > >> upgrade the bios but would rather not. Why wouldn't 66Mhz*2.5 work as > >> well? My bios right now is *-0109. Is there anything peculiar about > >> K5s above 133Mhz? > >> > > > >When you clock a K5-166 at 66x2 you are slowing it down to K5-133 speed > >because the K5-133 runs at 100MHz. The K5-166 should be jumpered for > >166MHz like a Pentium (66 x 2.5). The circuits inside the chip will > >modify it to 1.75. > > > >The only way to overclock a K5 is to use a higher bus clock (i.e. 75MHz) > >because of the way the clock multiplier on the K5 works. 75MHz will > >generally work, but 83MHz will not. At 75MHz bus clock, the K5-166 will > >be probed and run at or almost at Pentium 200 speeds. Stability is > >questionable though and depending on whether your MB supports async PCI, > >37.5MHz may be too high for some PCI SCSI cards. > > > > > >> -- Jay > >> > >> On Wed, 27 Aug 1997, Cameron Slye wrote: > >> > >> >> > >> >> I've only a 166 MHz but I've made several "make world" without problems. > >> > > >> >How much memory is in that box ? I have a asus p55t2p4 here, with a 166 in > >> >it. 25 make worlds finished with only 32mb in 2 slots, but with 64mb in 4 > >> >slots, it died in the first make world. (sig 11) > >> > > >> > > >
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