Author: Aaron Gordon
Date: 14:29:28 02/19/03
Go up one level in this thread
On February 19, 2003 at 16:30:14, Robert Hyatt wrote: >Sure there are. And they take _years_ to run. You have to run all four billion >possible >values thru every possible instruction, in every possible sequence, with every >possible >pipeline delay, at every possible temperature, with every possible voltage >variance with... > >You get the idea... No one tests this way, not AMD, Intel, IBM, etc. It would be a waste of time to do so, too. You make the silicon and see what range it can do and you make the chips at or below the minimum clock speeds attainable by those chips. For stability testing a Prime95/Memtest86 combo is all thats needed. If you want to take videocards into account (high AGP speed, etc) you just run 3DMark2001 or 2003. Newer Nforce2 boards lock the AGP speed at 66mhz (or have it adjustable) so you don't have to worry about it (same with the PCI speed). >Possibly, but that's "business". But they weren't producing 2.8's that could >run reliably at >3.06, which is the topic here... They could, infact. They were clocking up to 3.2Ghz consistantly. I doubt we'll even see 3.2Ghz for a while due to the heat those chips put off. As I mentioned before a P4-3.06GHz is 110 watts. Also, I'm not sure if you're aware but temperature/voltage helps a lot with overclockability. If you get the CPU cold enough (-120C to be exact) you could effectively run 2x your max ambient air temp and it would NOT be considered overclocking. Here's a small graph I grabbed from Kryotech (makes Freon cpu coolers). ftp://speedycpu.dyndns.org/pub/cmoscool.gif Also when overclocking you need to use a bit of common sense. Lets say 1.6GHz is stable at 1.6 volts, 2.0GHz is stable at 1.75v and perhaps the upper limit of the theoretical chip I'm speaking of is, say.. 2.2GHz at 2.00v. If you test at 2.00v and it failed in prime95 after 1 hour and they drop the MHz down to 2.1GHz, you don't think it'll be completely stable? Of course it would be. I've seen some servers fail at prime95, NON overclocked. It's that sensitive. If you drop the clock speed THAT much (100mhz) from an already almost fully stable setup it will be completely stable. It's still overclocked, yes, but being so doesn't automatically warrant diepeveen hand-waving. :)
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