Date: Mon, 05 Apr 1999 21:09:52 -0600 From: "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: <37097B00.2186EB92@dtgnet.com> References: <Pine.LNX.4.04.9904051605450.10244-100000@hades.riverstyx.net> <3709569A.70EEC38A@uswest.net>
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Darren Pilgrim wrote: > > unknown@riverstyx.net wrote: > > I may be out to lunch on this one, but I'm pretty sure that the multiplier > > is for the internal clock of the chip. So, if, after applying the > > multiplier to one chip you get 300MHz, and after applying a different > > multiplier to a different chip with a different bus speed you also get > > 300MHz, you get two chips that perform the exact same number of > > operations/sec. The difference is the bus speed, which affects I/O > > performance, etc. A 100 MHz bus with a x3 multiplier will outperform a 66 > > MHz bus with a x4.5 multiplier because the CPU will have to wait more > > often when it wants to fetch non-cached data from RAM. > > 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. Samuel Greear To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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