Ok
Another question has come to mind regarding this subject.
Is the PCI bus in the 7500ish Mac's a 32, or a 64 bit bus?
I'm assuming it's 32 bit.
Also, What is the top end of the transfer rate on the internal SCSI 2 bus.
Is it 5, or 10 Mbyte/sec.
Thanks again
Dean
on 3/18/01 10:40 PM, Mike Friese at [EMAIL PROTECTED] wrote:
> Actually, it will depend on the drive. Some Ultra SCSI 3 drives,
> especially those with 50 pins may not be limited by the 7500's bus. It
> depends on the model of the drive.
>
> That being said, my 7200 RPM 18 gig drive IS slowed by the internal bus
> (on my 8500, same as the 7500) to about 2/3 of its potential speed.
>
> And I have a 10K RPM 18 gig drive that is almost 3 times faster than the
> internal bus so I put it on an Adaptec LVD controller.
>
> You need to read your disk manual and make a cost/performance trade-off.
>
> Mike Friese
>
>>> Does anyone know if the internal 50 pin "Fast SCSI 2" bus in a 7500 desktop
>>> Mac will support a 50 pin Ultra SCSI 3 Hard Drive.
>>
>> The drive's data throughput will be limited by the SCSI 2 bus; it will
>> work, but
>> you'd be better off installing an Ultra SCSI controller card to serve as a
>> dedicated
>> bus for the new drive. You'll add support for up to seven internal and seven
>> external *FAST* drives/devices. Spend a few bucks for an Adaptec 2930U;
>> $99 retail,
>> but just prowl ebay until you can steal one for ~$30 - a good investment
>> if you
>> intend to keep your 7500 in the family....
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