"Michael J. Flaherty" <[EMAIL PROTECTED]>
wrote:
> Do you have 70ns VRAM in the Mystic 040 ? If so,
where did you
> find it ? I haven't been able to locate any.
I don't know. I have never thing of this problem. I
just overclock
it and it works. I had overclocked 4 LC575 board and
one of them
could only be overclocked to 38MHz, others could work
at higher
freq like 43MHz but the CPU must have heat sink and
fan.
> I'm guessing that you have a 20 MHz crystal in this
575 board which
> forces the 601 (originally a 100 MHz PPC upgrade) to
run at 120
> MHz (3x 040 speed), correct ? How does it perform ?
Exactly. The change is same as normal LC575. But its
very unstable,
I tested it to run more than 4 hrs, OK. Yesterday, I
could not run
it for several minutes even at 96MHz. I will test it
with better
ventilation to see.
> 8.1 is a little bit slower on the desktop and slower
to startup
> for sure. Once it loads up, it's fine. It really
doesn't feel
> slow, even at 33 MHz, which is what my Mystic runs
at.
Thank you. Two years ago, I ran a 40MHz 575/36MB for
a year for
daily work with sys 8.1 . Web browsing was slow. But
most of the
work was using telnet. That was fine.
> I don't know the exact percentage of slowdown you
will experience
> with 8.1. Since you have your Mystic running at 43
MHz, I would
> probably use it. Your machine is quite fast and
should run it
> well. You've built a machine for lifting heavy
weights. If it
> was mine, I would want to give it some weight to
lift just to see
> how it performs. You can always go back to 7.1,
7.5.5, or 7.6.1
> if you find 8.1 unsatisfying.
>
> My notion of the perfect OS for an 040 Mystic is as
follows :
Thank you very much. Then, I will install 8.1 into
HD, 7.1 into
RAM disk and use the DiskCopy to create an image.
Whenever I want
7.1, I'll generate it from the disk image and reboot.
I don't want to hook a CD-ROM drive. I'll access CD
through a networked
G4-cube. Further, I doubt if I could simply copy the
whole RAM disk
in and out (it seems to me I cannot simply copy to
make a boot HD,
I have to install in order to make a boot disk),
therefore, I prefer
the DiskCopy.img approach.
> I would still use 8.1, although it will use up a
large portion of
Its 10MB from my experience.
> your RAM. Depending on the software you run, you
may need RAM
> doubler or virtual memory at times, which would be
undesirable.
I guess I'll use virtual memory rather than RAM
doubler because VM
is native from Apple and free.
> From what I've read on the CC forum, 64 and 128 MB
SIMMs won't work
> with the PPC upgrades, which is unfortunate. Your
chosen configuration
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