It's quite possible to enable it over PCI and it works quite nicely.
Most of the time it should not cause any problems, but YMMV as with any
hack. The downside is sometimes performance can take a dive due to
sharing bandwidth with other PCI devices. G4s and later don't have the
problem since the AGP slot is a separate bus from PCI.
I have found that a six PCI slot Mac with the two Bandit controllers
(9500, 9600, Power Tower Pro, Daystar Genesis) can avoid the
performance issues. Since these systems have two completely separate
PCI buses you can put the video card all by itself on one and it
doesn't have to share (and you still have 3 more slots free for other
stuff). The Umax S900 and J700 clones, while based on the same Tsunami
motherboard architecture as the 9500/9600, replaced the second Bandit
chip with a PCI bridge chip; this allowed up to six slots but it was
all on one bus rather than two, so everything has to share bandwidth.
The B&W G3's 66MHz PCI slot also uses a PCI bridge so even it has to
share with other cards and thus can suffer from similar problems.
- Alan
On Feb 15, 2006, at 10:23 PM, Kris Tilford wrote:
On Feb 15, 2006, at 2:31 PM, Unsupported OS X wrote:
For those of us with older video cards, is it possible to hack Quartz
=
Extreme enabled?
I thought I had read somewhere that these features could be turned
over =
to the processor, but were disabled for perfomance reasons. I'm just
=
curious if that is true.
You must have a Radeon or GeForce video card, and then you can use PCI
Extreme 3.1 to enable QE on older unsupported Macs. I've seen flashed
PC Radeon 7000's for cheap, so it's not too expensive. I've not had
issues, but some report freezes with QE enabled.
Kris
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