>>Greetings.
>>
>>Q: is the bus on a 7x00 series too slow to effectively
>>use a USB CD-RW? I've heard that there are some
>>issues with writing CDs on older systems using USB
>>instead of SCSI.
>>
>>Thank you!
>>
>>Wm Voelker
>
>First you need to identify the bottle neck correctly. The
>73/75/7600 computers run with a bus speed of 40 Mhz, and can move
>about 10 M Bytes per second to/from memory. The real problem is USB
>which only runs at 12 M Bits per second (1.2 M Bytes per second).
>With a USB CD-RW, regardless of the system, the best you will be able
>to run at is 4x burn rate. If speed is really important, look at
>either a Firewire based CD-RW or a SCSI one.
As much as this gets said it still gets missed. 7300, 7500, 7600, 8500 and
so on machines operate at a MAXIMUM bus speed of 50MHz, the actual bus
speed depends on the daughter card. The 7500 for example only shipped in
one version with a 100MHz 601. This was divided by 2 for a 50MHz bus.
Those machines with a 132MHz processor had a divide by 3 and a 44MHz bus.
120MHz machines with a divide by 3 operated at a 40MHz bus.
--
Clark Martin
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