On 10/22/02 at 11:01 PM -0700, Charles Baker wrote: >I have Quartz Extreme enabled on my 9600/300... > >A 33MHz/32-bit PCI bus can sustain 132 MB/sec throughput.
That's the theoretical limit, but most Old World machines, especcially those saddled with PCI 2.0 slots (all those prior to the Mach 5 and Beige G3) will have a hard time taking advantage of that bandwidth. On the 8500 List people report having a hard time getting over 40 MB/s of real world sustained throughput with RAIDs that should be capable of faster. I know on my old 8500, AV stuttering is a problem with my SCSI, FW or IDE cards. I wouldn't be surprised if a 9600 as a more robust PCI bus. >Most 7200RPM IDE drives will put out between 20-40MB/sec in >read/write access. The onboard SCSI interface will run 5-10MB/sec. >That leaves the rest of >the bandwith to video and some networking/input devices. Do you know what the bandwidth of video is? I've seen it calculated before, but I don't recall what it was. IIRC, high resolution video exceeds the limits of FW (>50 MB/s). >All effects for me on a daily basis are always much snappier than when >QE is disabled, while freeing up more CPU for other tasks. I would say >for me, an overall 5% performance advantage overall, and with heavy GL >tasks a 75% advantage. I would highly recommend enabling it if it is >possible for you. Even with more than one IDE drive you should see >positive results. YMMV, of course :) I enabled it before with my Radeon 7000. I noticed little difference, though I didn't test it as thoroughly. I definitely experienced the reported slowdown in iPhoto when PCI QE is on. (Does iPhoto rely on OpenGL?) Now that switched to IDE drives and have 2 monitors attached to my 7000 I turned QE off, because that is asking too much IMHO. I guess the nice thing is turning QE on or off is a pretty easy thing to do if you're willing to sit through a restart. Maybe I'll test it again. -- _______________________ Phil Lefebvre Chicago, IL -- Unsupported OS X is sponsored by <http://lowendmac.com/> Support Low End Mac <http://lowendmac.com/lists/support.html> Unsupported OS X list info <http://lowendmac.com/lists/unsupported.html> --> AOL users, remove "mailto:"; Send list messages to: <mailto:UnsupportedOSX@;mail.maclaunch.com> To unsubscribe, email: <mailto:UnsupportedOSX-off@;mail.maclaunch.com> For digest mode, email: <mailto:UnsupportedOSX-digest@;mail.maclaunch.com> Subscription questions: <mailto:listmom@;lemlists.com> Archive <http://www.mail-archive.com/unsupportedosx%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
