Re: [SM] SM900+PM7600: Which CPU Ugrades? > Jeff Walther wrote: > > It completely depends on the type of applications you're using. The > 800 MHz G4 which is available runs the CPU at 20 times the bus speed. > So any time the CPU must wait for access to the memory it takes quite > a performance hit. But, the caches on that CPU are running quite > fast and the CPU has good access to them. > > So for applications which stay mainly in the cache, 800 MHz will be > close to twice as fast as 400 MHz. However, for applications which > spend a lot of time accessing the memory because the cache missed the > needed data, the 800 MHz won't be a lot faster than the slower CPUs. > > A good average cache hit percentage is 85%. So figure on the > average an application is sending the CPU out to the slow memory for > data about 15% of the time, but the rest of the time you really are > benefiting from the additional speed. >
I just picked up a G4-800 card for my S900 and this addresses a concern. We do our serious work in Quark, Photoshop, along with a little in Illustrator, Internet Explorer and a couple others. How can I tell which applications "stay mainly in the cache"? Secondly, I've got 640 MB of RAM. Would it help if I created a RAM Disk to run any problem (slow) apps in there? I've been at G3/300/512K for a long time so I expect that the overall difference will be significant. Just seeing if I can make it a little better. Thanks for any help you can offer. Jerry -- 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 ---------------------------------------------------------------
