On Jan 17, 2006, at 7:34 AM, Peter da Silva wrote:
I am honestly surprised that you get that kind of throughput on a
Powersurge motherboard through the PCI bus. The Powersurge PCI
bridge is notoriously bad, and I've seen claims that the available
bandwidth is as low as 17 MB/s. Are you sure that your measurements
allow for the disk cache?
Running an 18GB Seagate Barracuda 36ES Narrow SCSI (a rare drive) in
a PowerMac 7600 G4/400, I get 18-20MB/sec- the maximum that the
Adaptec 2930 can pass thru it's Ultra Narrow connection.
With an TurboMax Ultra ATA/33 card in the past in a similar machine
(PowerMac 7600 G3/400), I got 17MB/sec writes and 24 MB/sec reads
with a 46GB IBM 75GXP. The Mobos from the PowerSurge 73-9600 series
were similar but not exactly the same so that could account for some
differences between our machines.
There were many mentions of the poor implementation and thus
performance of the 7300-9600's PCI bus when the ATA cards came out
and I remember that a number of people mentioned that the SCSI cards
had far fewer performance problems than ATA cards. In fact many ATA
cards were not qualified for use on these machines due to performance
issues even though they still work (I used a number of "unsupported"
models in many of the Apple & clone PCI machines). I'll take a look
at the XLR8YM! site for the info (where I remember it from oh so many
years ago).
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