On Friday, November 25, 2005, at 03:12 AM, Kennedy Brandt wrote:
Charles wrote:
Have NOT (so far) been able to fine a faster buss(vs 50) speed that
doesn't flake out.
The S900 logic board was very picky about a lot of things -- bus speed
being
one of them. One of UCC's own processor configurations would default
the
bus to something like 51.8MHz, and that was just about the upper limit.
Many of our own configurations ended up running the bus at somewhere
between
45 and 50MHz.
Last night, I kicked the Bus speed up to 51.0, and it seems to be
accepting that. Try more later.
C.
Our lead hardware engineer once explained that most third-party
processor
upgrade vendors just didn't get the significance of the bus-speed
multiplier
setting (Apple only shared it with actual Mac OS Licensees, like UCC,
IBM,
Motorola, Power Computing) nor how critical it was to smooth operation
of
UCC's logic boards
So, bottom line, even in the original manufacturing & lab settings at
UCC,
we had trouble running an S900 at >50MHz, too.
-KB
http://home.earthlink.net/~supermac_insider/
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