> From: Clark Martin <[EMAIL PROTECTED]> > Subject: Re: [PCI] 7500 Questions > > At 10:06 AM +1000 6/16/04, David Elmo wrote: >> All the advice from Ron (and others) is sound, just want to add that if you >> do get an upgrade processor, try for one with the biggest backside cache you >> can (without going over a sensible budget). I would recommend at least 500MB >> Ram and a 1MB backside cache. Ram and caches make for just as important >> performance boosts as processor clock speed. > > > And stick to a 2:1 cache if at all possible. That is a cache that > runs at half the speed of the CPU > -- > Clark Martin
In a 7600 I have a Powerlogic G3/4 processor with a 1MB backside, in the Cache Profiler software one can alter the cache ratio from 1:1 to 3:1 with 3:2. 2:1, and 5:2 in between. One can also set the switches on the cpu for different clock speeds. I had 360Mhz at 3:1 (giving a cache speed of 135MHz) for a long time and it was very steady indeed. But one day, a few months ago, I got all wild and upped the clock speed to 405MHz, keeping the 3:1 backside ratio. All was fine. Recently, I thought, hell, why not up the ratio a notch to 5:2 (going to a backside speed of 162MHz - closer to what I run an excellent XLR8 G3 CPU on my 7300). But I got more freezes which may be attributable to this cache ratio change (not sure, there are complications). But now you raise this Clark, one of those wild feelings came rushing over me and I have just changed it to 2:1 and will know the effects next few times I start. David Elmo -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.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/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
