Date: Tue, 06 Apr 1999 04:20:11 -0700 From: Darren Pilgrim <dpilgrim@uswest.net> To: "Dragon Knight ][" <dragonknight@dtgnet.com> Cc: FreeBSD Questions <questions@FreeBSD.ORG> Subject: Re: K6-2/333, was: Re: Debug kernel by default (was: System sizewith -g) Message-ID: <3709EDEB.BE17A2E8@uswest.net> References: <Pine.LNX.4.04.9904051605450.10244-100000@hades.riverstyx.net> <3709569A.70EEC38A@uswest.net> <37097B00.2186EB92@dtgnet.com>
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"Dragon Knight ][" wrote: > Darren Pilgrim wrote: <snip> > > While this is mathematically and theoretically sound thinking, tests > > have shown that there is little CPU/memory performance gain with a > > 100MHz bus. Just take a look at www.tomshardware.com. As for my own > > systems, I run K6-2 333s at 5x66 just because it sets the PCI and AGP > > clocks at their spec'd rate of 33 and 66MHz, respectively, while > > providing the CPU's spec'd 333MHz. > > > > As you say, there is a little CPU/Memory performance increase at 100MHz fsb. > So I do not see your logic in setting your chips at 5x66 because it puts your > PCI and AGP where they should be. One of the 'specs' of the 100MHz fsb is > that PCI and AGP cards will run at their normal speed of 33 and 66MH. I believe > this is also true of the 95MHz busses. Actually I said "there is little", I didn't put an "a" in there. Plus the only performance increases I've ever seen are on stress-test benchmarks where the disk, memory, and video are all in use at once. This situation is purely for performance testing, there's is no real- world application. 95MHz produces slower AGP/PCI clocks and, lacking a performance gain with a faster FSB, using 66MHz to get faster AGP/PCI clocks makes more sense if your CPU isn't rated for a 100MHz multiple. This is just splitting hairs; IRL, a <4MHz clock difference is nothing performance wise. Your cards might complain about it though. Particularly the ones that rely on the bus-clock for their internal clocks, like some sound and video cards. -- dpilgrim@uswest.net /\ / __ Our lies are merely the gryph@mindless.com / \/OC/URNE truth of another world ICQ: 29880099 Death is not a kill -9, just a DALnet: anim0s make world and shutdown -r now PGPKey available To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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