On Mar 1, 2004, at 09:52 pm, Tom Tubman wrote:
Right. You have a 9600/233.
Actually it's a 9600/200
D'oh!
Luckily, your motherboard can go up to 50MHz with no problem as that was the spec for all the MBoard components in the 7300-9600 PowerSurge series
Only if I have a CPU board with a variable clock speed setting right? I have a Sonnet - enough said?
(though some 256k L2 caches from the 120 MHz models can't do more than 45 MHz, but they can be replaced).
Some 9600s with that defect have the L2 cache soldered to the board, and if you have a CPU that pushes the board up to 50MHz it just won't work right.
For a 233 MHz CPU, the supported bus multiplier was 5x: 233 � 5 = 46.7MHz.
Any idea what it is for a 200MHz? It might be that my board was at 50MHz but my G3/300 card dropped it to 46.7, dunno as my 9600 came stripped.
That explains it. I assumed you still had the original 604e chip in it- the only 604e chip that ran the bus at 46.7 MHz was the 233 MHz board. The 200 MHz 9600 ran at 50MHz.
The CPU daughtercard determines the bus speed in the 7300-9600 machines, so depending on the settings, it will be set to anything from 40-50MHz (though the later PowerLogix and XLR8 G3 and G4 boards gave you the option of going up to 62 MHz- some [very few] of these machines *will* run at those speeds). Sonnet is known for using conservative bus speeds on their G3 upgrades as most companies' 300 MHz boards are set at 50 MHz (6 x 50). Yours is apparently 46.67 x 6.5 = 303 MHz. One of my users has one of those in a PowerCenter.
I experienced no corruption with any ATA cards and I had many of the early models (TurboMax ATA/33, etc.) in many different Macs and clones. They merely ran slower than the rated 33 MB/sec on machines older than the Beige G3 and were never officially supported.
Yeh, it was weird - some people did and some didn't - very much pot luck. I forget the vagaries of it now but I do remember it being an issue. This was early 2001 in the era of the G4 cube and just pre-OS X, when I was first on the PCI Powermacs list and a <gasp> Mac newbie.
Look at me now...!
Woo-hoo!
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