> Just a little problem - what is 'speculative access'? and how to you > turn it on and off.
Speculative access allows the processor to guess what the next instruction is going to be and will prefetch it to reduce wait times. If it guesses right, you get a nice speed boost, if it guesses wrong, you break even. Why you should turn it off or on is noted below. > <snip> > I noticed that the G3 266DT has 'speculative access' switched on and > the > C500 has it switched off. While it is okay in a native G3/G4 machine, you DO NOT want to turn speculative access on if you are using a g3 upgrade in a 601/3/4 machine. I forget what the reason is exactly but it has something to do with the firmware not knowing how to handle spec acc. correctly and causing errors and possibly crashing. Of an interesting note, OSX does know how to handle spec acc correctly on our machines and should be turned on if you are using OSX. > The C500 is reading 31 MB/sec (40mhz bus) or less for memory and the G3 > 266DT is reading 63 MB/sec memory (66mhz bus). > This would be normal, if you overclock your motherboard, you should see an increase in the MB/sec rate. Also keep in mind that the G3 uses a faster kind of memory than the c500 does. Even if you did manage to get the C500 to 66mhz (nie impossible), your MB/sec still wouldn't match what the G3 could do. Still, 31MB/sec is pretty good for one of these machines. -Robyn -- SuperMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | Service & Replacement Parts [EMAIL PROTECTED] | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> SuperMacs list info: <http://lowendmac.com/supermacs/list.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/supermacs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
