Date: Thu, 10 Jun 1999 00:21:32 -0400 From: Tom Embt <tom@embt.com> To: jin@george.lbl.gov Cc: freebsd-hardware@freebsd.org Subject: Re: P-II vs K6-2 Message-ID: <3.0.3.32.19990610002132.0097c14c@mail.embt.com> In-Reply-To: <199906100224.TAA05830@george.lbl.gov>
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> >Notice that ALL K6-II/III and P-II/III are at fixed bus multiplexer. >Only overclock is to over clock the bus speed. I was not aware K6-II/III were multiplier locked. I can't say I'm surprised though. I haven't had any direct experience with these AMD chips but other people on the list say they're quite snappy under FreeBSD. >> Also, use of a quality motherboard is helpful in overclocking. > >I am using ASUS P2B-B/F and P2B. I will get some P99ZX soon. >I can overclock P-III-450 to 500 (110 MHz bus), so it sounds like not the >motherboard problem. Just think the ALL Celeron may be made by same quality >silicon, maybe 475MHz is the top speed. So, 300 one can run at 100 MHz bus, >but 400/433/466 will only run at 75/83 MHz bus clock. To result maximum CPU >speed about 450-525. >So, may be the right choice is to buy 300A CPU instead any thing above it >for best performace/price. > >The difference will be the heat. overclock 400 to 450/500 will NOT increase >the CPU temperature. And you said overclock 300 to 450 needs a better cooling >sink/fan. > > -Jin > Yep. It is probably worth mentioning that while any BX board is within spec at 100MHz, some will handle an "on the edge" chip better than others. Your statement that buying the 300A instead of higher priced Celerons for the best performance/price is exactly true IMO. Others could(will?) argue "just buy a 433/466 and don't worry about it." That is a good option too, if a little more expensive. The original Celeron post I made was written when a 333 was about the fastest (Celeron) available. There is a degree of luck involved, but even if the first 300A doesn't overclock, you could always sell it at a reduced price, buy a new one which probably will overclock, and still be cheaper than a 433 or 466. Truth is.. some just OC better than others. A friend's 300A will not even boot Windows at 450MHz/2.3v. I'm sitting next to one that runs great at 464MHz/2.1v. I've heard tales of PPGA 300A's that run flawlessly at 504MHz/1.85v!! Note that normal is 2.0v, but the person in question reduced it for "cooling purposes". ..of course you could also throw your board/cpu into a vat of mineral oil along with an air conditioner... Tom Embt tom@embt.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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