Re: Alls quiet?

[Gerald Wilson]

Although, if you can be bothered to do the calculations, you find that 
some bus speeds work out sweeter than others (because of the number of 
wait-states needed by the RAM to sync to the bus).

On paper, AFAIR, the PowerSurge bus at 50 MHz delivers the same memory 
throughput as a PC bus at 66 MHz. One less wait state involved, I 
think. Overdriving the bus beyond 50 MHz usually forces another 
wait-state, which therefore reduces the memory throughput.

I had it all on the back of an envelope once...

GWW

On 5 Mar 2004, at 17:02, Tom Tubman wrote:


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.
Well, in theory at least, this gives greater compatibility, which is 
important for them as you can't actually alter it on the card like 
other vendors' cards.
Exactly.  I had a PowerLogix G3 350/175/512k L2 which would not run 
reliably at a 50 MHz bus speed (the same machine ran another card at 
57 MHz bus), so I used it at 46.7 MHz bus speed.  However, the G3 chip 
itself was a whale of an overachiever and ran at 467 MHz reliably, so 
the lack of 50MHz bus speed was a non-issue as I needed to run at a 
46.7 MHz bus anyway to get the G3 to 467 MHz.

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